JP2010049647A - Client server system, client computer, server, file management method, and program therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly perform synchronous processing independently of the data amount of a file, and also to facilitate a user to confirm that the file is in the latest updated version. <P>SOLUTION: A client server system includes: a client 10 having a file list updating means 18 which generates prescribed information corresponding to each of files stored in a storage means 11 as a file list; and a server 30 having a file list updating means which generates prescribed information stored in a storage means as a file list. The client 10 includes a comparison means 14-2 for comparing the file list received from the server 30 and the file list of the client 10 with each other and a transmission means 14-3 for transmitting a file relating to the difference between these file lists to the server 30, and the server 30 stored the file relating to the difference between them. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a client server system constituting a communication network, a client computer and a server provided in the client server system, a file management method for managing files stored in the client computer, and the file management method. In particular, the present invention relates to a client server system, a client computer, a server, a file management method, and a file management program for managing a file stored in a client computer by a server.

When introducing a personal computer in a company or the like, a communication network such as a LAN (Local Area Network) or a WAN (Wide Area Network) is generally constructed.
Here, there is a client server system as one form of LAN.
The client server system includes a client computer (client) operated by a user and a server computer (server) that performs data management, print control, and the like of a plurality of clients.

When the client server system is introduced into a general company, the employee inputs information on business, management, customer, etc. to the client.
Such input information is normally strictly managed so as not to leak outside the company. For example, leakage is prevented by encrypting disks and files.
However, a malicious act of stealing the installed client as it is, decrypting the code, and acquiring information has occurred.
When such an action occurs and information may be leaked, it is necessary for the company to take measures such as grasping customer information stored in the client and contacting related parties.

However, the above-mentioned encryption is for information leakage countermeasures, and is not intended to take a backup when data is lost. For this reason, if the client main body is stolen, the information is not left in the hands of the company, and it is impossible to restore the information.
Also, by taking a backup, information can be left on the company's side. However, it was not possible to prove whether the backup information was the latest or not updated.

Therefore, a technique has been proposed in which the same file is stored in each of the client and the server, and the updated file is stored in both the client and the server each time it is updated (see, for example, Patent Document 1). .)
According to this technique, even when a client is stolen, a file remains on the server, so that customer information stored in the file can be taken out and contacted with related parties. In addition, since the update of the files stored in the client and the server is synchronized, the latest information when the client is lost can be obtained.
JP 2005-141756 A

However, the technique described in Patent Document 1 described above has the following problems.
For example, as a file management method, the technology copies two actual files on a client, compares them to obtain a difference, and transmits the difference to a server. For this reason, when the data amount of the file is enormous, it takes time to obtain the difference, and it takes a considerable time for the file synchronization processing.

In addition, although the technology can synchronize files between the client and the server, the user cannot grasp the status of the synchronization (update).
For example, the obtained difference is assumed to be used for synchronization, and is not assumed to be displayed for the user.
Even if the calculated difference can be displayed on the display, it cannot be confirmed whether or not the difference is related to the latest update.

  The present invention has been made to solve the above-described problem, and performs a synchronization process quickly regardless of the data amount of a file, and allows a user to easily confirm that it is the latest update. An object is to provide a system, a client computer, a server, a file management method, and a file management program.

  In order to achieve this object, a client server system of the present invention includes a client-side storage unit that stores one or more files, and predetermined information corresponding to each file stored in the client-side storage unit. Client computer having client-side file list updating means to be created as a file list, server-side storage means for storing one or more files, and predetermined information corresponding to each file stored in the server-side storage means A server computer having server side file list updating means for creating a server file list and server side transmission means for sending the server file list to the client computer, and the client computer is transmitted from the server computer. When there is a difference between the file list comparison means for comparing the server file list and the client file list, and the server file list and the client file list, a file related to the difference is transmitted to the server computer. And a server-side receiving unit that receives a file related to the difference, and the server-side storage unit stores the file related to the difference.

  The client computer of the present invention includes a client-side storage unit that stores one or more files, a client-side file list update unit that creates predetermined information corresponding to each file as a client file list, and a server computer If there is a difference between the file list comparison means for comparing the server file list and the client file list sent from the server file list and the client file list, the files related to this difference are displayed. The apparatus has a client-side transmission means for transmitting to the server computer.

  The server computer of the present invention includes a server-side storage unit that stores one or more files, a server-side file list update unit that creates predetermined information corresponding to each file as a server file list, Server-side transmission means for transmitting the file list to the client computer; and reception means for receiving a file related to the difference between the server file list and the client file list from the client computer. It is configured to store files related to the.

  Further, the file management method of the present invention corresponds to processing for creating predetermined information corresponding to each file stored in the client-side storage means as a client file list, and each file stored in the server-side storage means. When there is a difference between the process of creating the predetermined information as a server file list, the process of comparing the server file list with the client file list, and the server file list and the client file list, This is a method having a process of transmitting a file related to a difference to the server computer and a process in which the server-side storage unit stores the file related to the difference.

  The file management program according to the present invention includes a process for storing one or more files, a process for creating predetermined information corresponding to each file as a client file list, and a server program transmitted from a server computer. The comparison processing for comparing the file list with the client file list, and the processing for sending the file related to the difference to the server computer when there is a difference between the server file list and the client file list It is configured to be executed by a computer.

  The file management program of the present invention corresponds to processing for creating predetermined information corresponding to each file stored in the client-side storage means as a client file list, and each file stored in the server-side storage means. When there is a difference between the process of creating the predetermined information as a server file list, the process of comparing the server file list with the client file list, and the server file list and the client file list, The server computer is configured to execute a process of transmitting a file related to the difference to the server computer and a process in which the server-side storage unit stores the file related to the difference.

According to the client server system, client computer, server, file management method, and file management program of the present invention, the presence or absence of update is grasped by comparing predetermined information corresponding to files stored in the client and the server. Therefore, as compared with the comparison of actual files, it is possible to quickly grasp the presence / absence of update and perform synchronization processing.
Further, since the file information includes predetermined information such as the file update date, it is possible to easily grasp whether or not the file update is the latest by checking the file list.

  Preferred embodiments of a client server system, a client computer, a server, a file management method, and a file management program according to the present invention will be described below with reference to the drawings.

[Client server system, client computer, server computer]
First, an embodiment of a client server system, a client computer, and a server computer of the present invention will be described with reference to FIG.
FIG. 2 is a block diagram showing the configuration of the client server system of this embodiment.

As shown in FIG. 1, the client server system 1 includes a client 10 and a server 30. These are connected by a network 40 such as a LAN (Local Area Network) or a WAN (Wide Area Network).
Here, the client 10 is a computer that operates under program control, and as shown in FIG. 2, the storage means 11, the application software 12, the file list storage means 13, the data transmission / reception means 14, and the write permission. Determination means 15, mail transmission means 16, difference file list synchronization means 17, file list update means 18, file write control means 19, USB memory connection means 20, USB memory control means 21, and operation detection Means 22, operation pattern storage means 23, operation determination means 24, and password confirmation UI means 25 are provided.

The storage means (client-side storage means) 11 can be composed of a hard disk such as a local disk, for example.
One or two or more folders can be created in the storage unit 11. Each folder can store one or more files.
Specifically, as shown in FIG. 3, for example, folder A, folder B, and folder C can be created. In the folder A, files such as the file a1 and the file a2 can be stored. The folder B can store files such as the file b1 and the file b2. Further, the folder C can store files such as the file c1 and the file c2.
The storage unit 11 stores information regarding each file. The information (file information) regarding the file includes, for example, a file name, a folder name in which the file is stored, a file size, a file update date and time, and the like.

The application software (application, creation means) 12 is software designed for a specific purpose such as document creation / editing and numerical calculation. The application 12 includes, for example, a document editing application (word processor software), spreadsheet software, image editing software, and the like.
A file created by the application 12 is stored in the storage unit 11.

As described above, in this embodiment, the file created by the application 12 installed in the client 10 is stored in the storage unit 11, and the file is also stored in the server 30. The configuration is to synchronize with other files.
For this reason, in the present embodiment, synchronization management can be performed with the file of the client 10 as the original. This is different from the technique described in Patent Document 1 in which the file of the server 30 is the original.

The file list storage unit 13 stores a file list and a difference file list.
The file list (client file list) is composed of file information of each file stored in the storage unit 11. Specifically, as shown in FIG. 4, it can be configured by a management file ID, a file path consisting of a folder name and file name in which the file is stored, a file update date and time, a file size, and the like.

The difference file list is composed of file information of files that are not synchronized with the server 30. “File information of a file that is not synchronized with the server 30” refers to a file having a content different from the content of the file stored in the storage unit 31 of the server 30 when the storage unit 11 stores the file. Refers to file information.
Specifically, as shown in FIG. 5, the difference file list can be configured with a file ID, a file path, an update date and time, a file size, and the like.

The data transmitting / receiving unit 14 includes a connection monitoring unit 14-1, a file list comparing unit 14-2, and a file uploading unit 14-3.
The connection monitoring unit 14-1 monitors a connection state between the first network 41 and the server 30. In addition, when there is an inquiry from the write permission determination means 15 about the communication availability state with the server 30, the connection monitoring means 14-1 confirms the communication state with the server 30 and authorizes the confirmation result to write. Return to determination means 15.

  The file list comparison unit 14-2 transmits a file list transmission request to the server 30. The file list comparison unit 14-2 receives the file list transmitted from the server 30. Then, the received file list is compared with the file list retrieved from the file list storage means 13 to determine whether there is a difference. If there is a difference, file information related to the difference is created as a difference file list and stored in the file list storage means 13. Further, the file upload unit 14-3 is instructed to transmit (upload) the file and the file list related to the difference to the server 30.

Upon receiving an instruction from the file list comparison unit 14-2, the file upload unit (client side transmission unit) 14-3 and the file listed in the difference file list among the files in the storage unit 11 and the file list (related to the difference) File and file list) to be uploaded to the server 30. In the initial setting, the file upload unit 14-3 uploads all files stored in the storage unit 11 to the server 30.
As described above, by transmitting the file relating to the difference to the server 30, the file can be synchronized between the client 10 and the server 30.
In addition, by transmitting the file list of the client 10, the contents of the file list can be reflected in the file list of the server 30 (see FIG. 7), and the user can grasp the update process at the server 30. .

  The write permission determination unit 15 stores values of the number of times allowed for writing, a write permission time limit, and the number of times of writing, and determines whether or not writing to the storage unit 11 is permitted. That is, when the connection monitoring unit 14-1 is inquired as to whether or not communication with the server 30 is possible via the first network 41, the storage unit is returned when a reply of “synchronization is possible” is returned. 11 is allowed to be written. On the other hand, when a reply “not synchronized” is returned, writing to the storage means 11 is not permitted.

The mail transmission means 16 transmits the difference file list to the server 30 by mail.
In this way, by sending the difference file list by e-mail, even if the client 10 is stolen, the server 30 can grasp whether or not the file stored in the client 10 has been updated.
The difference file list synchronization unit 17 controls the USB memory control unit 21.

  The file list update means (client-side file list update means) 18 takes out information related to the file from the storage means 11, creates it as a file list, and stores it in the file list storage means 13. Further, it is monitored whether or not the file has been updated (update detection means). When the file is updated, the file list is taken out from the file list storage means 13, and the taken out file list is updated to update the file list storage means 13. To store.

Further, the file list update unit 18 creates and updates the difference file list. That is, the file list update unit 18 monitors whether or not the file has been updated. When the file is updated, the file list update unit 18 retrieves the differential file list from the file list storage unit 13 and updates the file to the retrieved differential file list Is added to the file list storage means 13.
As described above, the file list update means 18 monitors the update of the file and updates the file list when updated, so that new update information can be always registered in the file list. Thus, the user can easily grasp the presence / absence of update, the latest update date / time, and the like by checking the file list.

The file writing control unit 19 controls writing of a file to the storage unit 11. For example, when an instruction is received from the write permission determination unit 15 so as to reject writing from the application 12, the file is not written to the storage unit 11 (restricted). On the other hand, when an instruction is received from the write permission determination means 15 so as to permit writing from the application 12, the file is written to the storage means 11.
Further, the file writing control means 19 deletes the file stored in the storage means 11 when the password confirmation UI means 25 determines that the user is a third party.

A USB (Universal Serial Bus) memory connection means (recording medium connection means) 20 is a connector (USB port) for connecting the USB memory 50.
The USB memory (recording medium) 50 is a portable flash memory that is used by being connected to the USB memory connection means 20. In the USB memory 50, for example, a difference file list is stored.

The USB memory control means (recording medium control means) 21 writes the difference file list to the USB memory 50.
Thus, by writing the differential file list to the USB memory 50, it can be read by the server 30. For this reason, even if the client 10 is stolen, the server 30 can grasp whether or not the file stored in the client 10 has been updated.

The operation detection unit 22 detects that a user interface (UI) such as a keyboard or a mouse has been operated by the user.
The operation pattern storage unit 23 stores an operation pattern created based on a previous UI operation.
The operation determination unit 24 determines whether any of the operation patterns stored in the operation pattern storage unit 23 matches the operation content detected by the operation detection unit 22. If there is a match, it is determined that the user is a regular user. On the other hand, when there is no match, it is determined that there is a possibility that the user is a third party who is not a regular user.

Here, a known technique can be used as a method for storing an operation pattern and a method for determining a difference in pattern.
For example, the daily work pattern analysis unit analyzes the regularity of application start time, end time, combination of applications to be started, activation order, and the like. In addition, the file usage pattern analysis unit analyzes the regularity of the time when a specific file was opened, the time it was modified, the time it was saved, the combination of files used simultaneously, the order of activation, etc. . Further, the file / application relation analysis unit analyzes the combination of the activated application and the opened file.
In addition, it can analyze command usage patterns, file name naming patterns, network usage status, and so on.

The password confirmation UI unit 25 performs user authentication using a password. This user authentication is performed when the operation determination means 24 determines that the user may be a third party.
If the correct password is input as a result of the determination, it is determined that the user is an authorized user. On the other hand, when the correct password is not input, it is determined that the user is a third party.

  The server 30 is a computer that operates under program control. As shown in FIG. 6, the server 30 is a storage means 31, a file list storage means 32, a communication data management means 33, a file list update means 34, and a difference file list. A synchronization unit 35, a USB memory connection unit 36, a USB memory control unit 37, and a file list display unit 38 are provided.

The storage means (server-side storage means) 31 can be composed of a hard disk such as a local disk.
A folder for each client 10 can be created in the storage unit 31. In addition, one or more folders can be created in each client 10 folder. Further, one or more files can be stored in each folder.

The file list storage unit 32 stores a file list and a difference file list.
The file list (server file list) is composed of information relating to files stored in the storage means 31. Specifically, as shown in FIG. 7, the file list includes a PC ID, a file ID, a storage file path, a file path, an update date / time, a file size, an asynchronous update date / time, and an asynchronous file size. Can be configured.

Among these, “asynchronous update date and time” and “asynchronous file size” are copied (reflected) of “update date and time” and “file size” included in the file list transmitted from the client 10. . And if there is a difference between "Update date and time" and "Asynchronous update date and time" or "File size" and "Asynchronous file size", it should be updated after "Update date and time" Judgment can be made.
The difference file list can have the same configuration as that shown in FIG.

Upon receiving the file list transmission request transmitted from the client 10, the communication data management unit 33 retrieves the file list from the file list storage unit 32 and transmits it to the client 10 (server side transmission unit).
Further, the communication data management means 33 receives the file list and files transmitted from the client 10 (server side receiving means) and stores them in the storage means 11.

The file list update unit (server-side file list update unit) 34 extracts information about the file from the storage unit 31, generates this as a file list, and stores it in the file list storage unit 32. When the file is updated, the file list is extracted from the file list storage unit 32, and the extracted file list is updated and stored in the file list storage unit 32.
The difference file list synchronization means 35 creates or updates the difference file list and stores it in the file list storage means 32.

The USB memory connection means 36 is a connector (USB port) for connecting the USB memory 50. In the USB memory 50, for example, a difference file list or the like is stored.
The USB memory control unit 37 takes out the difference file list from the USB memory 50. The extracted difference file list is sent to the difference file list synchronization means 35.
The file list display means (display means) 38 displays the contents of the file stored in the storage means 31, the file list, the difference file list, and the like.
As described above, by enabling the display of the file list and the difference file list, the user can know that the file has been updated. Also, by viewing the update date and time, it can be known that it is the latest update.

  The network 40 connects the client 10 and the server 30 to transmit / receive predetermined data. The network 40 includes a LAN (private communication network) that is a first network 41 and a WAN that is a second network 42.

[File management method]
Next, the operation (file management method) of the client server system of this embodiment will be described with reference to FIGS.
FIG. 8 is a flowchart showing an initial setting operation in the file management method of this embodiment. FIG. 9 is a flowchart showing the operation of the file management method when the client and the server are connected. FIG. 10 is a flowchart showing an operation operation when the client and the server are separated.

(1) Initial Setting First, the initial setting will be described with reference to FIG.
In the initial setting, file synchronization is performed in a state where the client 10 and the server 30 are connected via the first network 41 (a communicable state).
The file list update unit 18 of the client 10 acquires information on all the files stored in the storage unit 11 (step 10).
The file information includes, for example, a file name, a folder name in which the file is stored, a file size, a file update date and time, and the like.
The file list update unit 18 creates a file list based on the acquired file information and stores it in the file list storage unit 13 (step 11).

Next, the data transmission / reception means 14 communicates with the server 30 via the first network 41. In this communication, the file list comparison unit 14-2 transmits a file list transmission request to the server 30 (step 12).
When the communication data management means 33 of the server 30 receives the file list transmission request (step 13), the communication data management means 33 retrieves the file list from the file list storage means 32 and transmits it to the client 10 via the first network 41 (step 14). .

The file list comparison unit 14-2 of the client 10 receives the file list (step 15). Further, the file list comparison unit 14-2 takes out the file list from the file list storage unit 13.
Then, the file list comparing unit 14-2 compares the information on the file included in the received file list with the information on the file included in the file list extracted from the file list storage unit 13 (step 16). Thereby, each information of all the files stored in the storage means 31 of the server 30 is compared with each information of all the files stored in the storage means 11 of the client 10.

If a mismatched file is found as a result of the comparison, the file list comparing unit 14-2 creates a difference file list based on information regarding the mismatched file and stores it in the file storage unit 14. Further, the file list comparing unit 14-2 instructs the file uploading unit 14-3 to upload the mismatched file and the file list. In response to this command, the file upload unit 14-3 uploads the mismatched file and file list to the server 30 (step 17).
On the other hand, if there is no mismatched file, the file and file list are not uploaded.

  Note that all files and file lists of the client 10 are uploaded at the first connection to the server 30. For example, as shown in FIG. 3, in the storage unit 11 of the client 10, the file a1 and the file a2 are stored in the folder A, the file b1 and the file b2 are stored in the folder B, and the file c1 and the file c2 are stored in the folder C. Suppose that it was stored. In this case, the file a1, the file a2, the file b1, the file b2, the file c1, the file c2, and the file list are uploaded to the server 30.

The communication data management means 33 of the server 30 receives the file and file list transmitted (uploaded) from the client 10 (step 18).
Then, the communication data management means 33 stores the received file and file list in the storage means 31 (step 19). At this time, the communication data management means 33 determines the PC ID that identifies the client 10, and the storage means 31 creates a folder for the determined PC ID (FIGS. 13 (i) and (ii)). Then, the storage unit 31 creates the same folder structure as the folder created in the storage unit 11 of the client 10 in the folder for the PC ID based on the information of the file list transmitted from the client 10 ( FIG. 3 and FIG. 13 (iii)).

  In the specific example described above, the same folder A as the folder A created in the storage unit 11 of the client 10 is created in the folder (PC ID) of the storage unit 31 of the server 30, and the received file a1 and file a2 is stored (FIG. 13 (iii)). Further, the same folder as the folder B is created in the folder (PC ID), and the received files b1 and b2 are stored under the folder. Further, the same folder as the folder C is created in the folder (PC ID), and the received files c1 and c2 are stored under the folder.

The file list update unit 34 creates (updates) a new file list based on the file information stored in the storage unit 31 and the file list information extracted from the file list storage unit 32, and the file list storage unit 32 (step 20).
When the operations so far are completed, the synchronization between the client 10 and the server 30 is completed, and the initial setting is completed.

(2) Operation with Client Connected to First Network Operation in this case will be described with reference to FIG.
As shown in the figure, the write permission determination means 15 of the client 10 is in a state where it can be synchronized with the server 30 (it is in a state where communication with the server 30 via the first network 41 is possible). The connection monitoring means 14-1 is inquired as to whether or not there is any.
This inquiry can be made at predetermined time intervals, for example.

The connection monitoring unit 14-1 receives the inquiry and confirms the communication state with the server 30 (step 30).
As a result of the confirmation, if communication is possible, a response that “synchronization is possible” is returned to the inquiry of the write permission determination means 15. In response to the reply, the write permission determination means 15 instructs the file write control means 19 to permit writing (step 31).
On the other hand, when it is not in a communicable state, it responds to the write permission determination means 15 as “synchronization impossible”. Subsequent processing in the case of “synchronization is impossible” will be described in detail in (3) “Operation when client is disconnected from first network”.

  The file list update unit 18 monitors whether or not the file stored in the storage unit 11 has been updated. In this monitoring, when a file update occurs (step 32), the file list update means 18 acquires file information (step 33), updates the file list based on the acquired file information, and the file list. Store in the storage means 13 (step 34).

Next, the data transmission / reception means 14 communicates with the server 30 via the first network 41. In this communication, the file list comparison unit 14-2 transmits a file list transmission request to the server 30 (step 35).
When the communication data management means 33 of the server 30 receives the file list transmission request (step 36), it extracts (acquires) the file list from the file list storage means 32 and transmits it to the client 10 via the first network 41 ( Step 37).

When the file list comparison unit 14-2 of the client 10 receives the file list (step 38), each information of the file constituting the received file list and the file list constituting the file list extracted from the file list storage unit 13 are displayed. Each information is compared (step 39).
If a file that does not match is found as a result of the comparison, the file list comparison unit 14-2 instructs the file upload unit 14-3 to upload the file that does not match and the file list. As a result, the file upload unit 14-3 uploads the mismatched file and the file list (step 40).
On the other hand, if there is no mismatched file, the file and file list are not uploaded.

  When the communication data management means 33 of the server 30 receives the file and file list transmitted (uploaded) from the client 10 (step 41), it stores them in the storage means 31. At this time, the folder for storing the received file is determined based on the PC ID that identifies the client 10. Then, based on the received file list, the files under the folder are updated (step 42).

Further, the file list updating unit 34 creates a new file list based on the file information stored in the storage unit 31 and the file list information, and stores the file list in the file list storage unit 32 (step 43).
Every time the file is updated, the operations described here are executed.

(3) When the client is disconnected from the first network The operation procedure in this case will be described with reference to FIG.
As shown in the figure, the write permission determination means 15 of the client 10 is in a state where it can be synchronized with the server 30 (it is in a state where communication with the server 30 via the first network 41 is possible). The connection monitoring means 14-1 is inquired as to whether or not there is any.

The connection monitoring unit 14-1 confirms the communication state with the server 30 (step 50). As a result of the confirmation, when the state is disconnected from the first network 41 (a state where communication is not possible), a reply that “synchronization is impossible” is returned to the inquiry of the write permission determination means 15.
On the other hand, when the communication is possible, the write permission determination means 15 is replied that “synchronization is possible”. Note that “synchronization is possible” has already been described in (2) “Operation in a state where the client is connected to the first network”, and the description thereof is omitted here.

If “synchronization is impossible”, the write permission determination means 15 compares the write permission deadline with the current date and time (step 51).
As a result of the comparison, if the current date and time is outside the write permission deadline, the file write control means 19 is instructed to refuse writing from the application 12.
On the other hand, if the current date and time is within the time limit of the write permission time limit, the write permission determination means 15 subsequently compares the number of times of writing with the number of writable times (step 52).

As a result of the comparison, if the number of times of writing is equal to or greater than the value of the number of writable times, the write permission determining means 15 instructs the file write control means 19 to refuse writing from the application 12.
On the other hand, when the number of times of writing is less than the value of the number of writable times, the file writing control means 19 is instructed to permit writing.

The reason for confirming the write permission time limit (step 51) and confirming the number of times of writing (step 52) is as follows.
Data cannot be synchronized when the server 30 and the client 10 are not connected. Therefore, by limiting the number of writes and the number of times, it is possible to restrict the data update from continuing asynchronously. In addition, by setting the number of writable times to 0, it is possible to perform an operation for prohibiting data update in an unconnected state.

In this state, when the application 12 is activated and the contents of the file b1 are updated by the application 12, the file writing control means 19 controls the writing of the file in accordance with the command from the write permission determining means 15 ( Step 53).
For example, in the case of writing permission, when writing is performed from the application 12 to the file b1, the file writing control unit 19 permits writing and updates the file b1. At this time, the file writing control means 19 adds the value of the number of writings simultaneously.
On the other hand, in the case of write rejection, the write from the application 12 to the file B fails, the file b1 is not updated, and the write count is not changed.

When a write request is made by the application 12 and the file b1 is updated under the write permission of the file write control means 19, the file list update means 18 detects the updated file b1 (step 54). .
After the detection, the file list update unit 18 acquires information on the file b1, and updates the file list and the difference file list based on the information (step 55).
In the difference file list, the difference between the file of the client 10 stored in the storage unit 31 of the server 30 and the file actually stored in the client 10 is recorded.

The mail transmission means 16 transmits the difference file list created (updated) by the file list update means 18 to the server 30 as an electronic mail (step 56).
However, when the second network 42 is not connected and transmission by electronic mail is impossible, or when mail cannot be transmitted due to other factors, the USB memory 50 is connected via the USB memory control means 21. The difference file list is copied (stored) to (step 57).

A case where the client 10 is lost in this state will be described.
The difference file list synchronization means 35 of the server 30 receives the email transmitted from the client 10 (step 58). Further, the USB memory control means 37 receives the difference file list from the USB memory 50 connected to the USB memory connection means 36 (step 59). This difference file list is sent to the difference file list synchronization means 35.
The difference file list synchronization means 35 updates the asynchronous update date and time and the asynchronous size values of the file information stored in the file list (see FIG. 7, step 60). As a result, it can be seen that the file stored in the storage unit 31 is out of synchronization with the file stored in the server 30.

The file list display means 38 can display the contents of the file list (step 61). As a result, the system administrator can refer to the information stored in the file list.
Although the file list stored in the storage means 31 is registered in the file list, the PC ID of the client 10 is searched from the file list on the screen of the file list display means 38 and stored in the client 10. You can display the information of the file that was saved.

In the file list, the storage location in the storage means 31 is registered in addition to the name and size of the file, so that the contents of the file can actually be referred to.
As for the file, it can be confirmed that the file of the client 10 and the server 30 are asynchronous, and the file can be confirmed to be synchronized.

(4) Reconnection of Client Next, the operation when the client 10 is reconnected to the first network 41 and can communicate with the server 30 will be described.
When the client 10 is connected again to the first network 41 (step 70), the data transmission / reception means 14 of the client 10 communicates with the server 30 via the first network 41. In this communication, the file list comparison unit 14-2 transmits a file list transmission request to the server 30 (step 71).

When the communication data management means 33 of the server 30 receives the file list transmission request (step 72), it retrieves (acquires) the file list from the file list storage means 32, and transmits it to the client 10 via the first network 41 ( Step 73).
When the file list comparing unit 14-2 of the client 10 receives the file list (step 74), each information of the files constituting the received file list and the files constituting the file list extracted from the file list storage unit 13 are displayed. Each information is compared (step 75).

If a file that does not match is found as a result of the comparison, the file list comparison unit 14-2 instructs the file upload unit 14-3 to upload the file that does not match and the file list. Thereby, the file upload unit 14-3 uploads the mismatched file and the file list (step 76).
On the other hand, if there is no mismatched file, the file and file list are not uploaded.

  When the communication data management means 33 of the server 30 receives the file and file list transmitted (uploaded) from the client 10 (step 77), it stores them in the storage means 31. At this time, the folder for storing the received file is determined based on the PC ID that identifies the client 10. Then, based on the received file list, the files under the folder are updated (step 78).

Further, the file list updating unit 34 creates a new file list based on the file information stored in the storage unit 31 and the file list information, and stores the file list in the file list storage unit 32 (step 79).
Thus, when the file upload is completed and the synchronization is completed, the file list update unit 18 of the client 10 resets the value of the write count and deletes the differential file list from the file list storage unit 13.

On the other hand, in the server 30, the communication data management means 33 stores the received file in the storage means 31, and the file list update means 34 updates the file list to the latest state.
When the difference information is added to the file list, the difference file list synchronization unit 35 deletes the difference information when the file is updated. This completes the synchronization.

(5) Response to Unauthorized Login Next, an operation when a person other than the authorized user (third party) performs unauthorized login when the client 10 is lost and tries to read information inside the client will be described.
The operation of the regular user is detected by the operation detection unit 22, and the operation is stored in the operation pattern storage unit 23 (step 80).
Further, when the operation detection unit 22 detects an operation on a UI (User Interface, not shown) (step 81), the operation detection unit 22 compares this operation with the operation pattern stored in the operation pattern storage unit 23 (step 82). .
As a result of the comparison, if it is determined that they are different, the password confirmation UI means 24 requests the user to input a password (step 83).

When the password is entered, the password confirmation UI unit 24 determines whether or not the password is correct (password authentication, step 84).
As a result of authentication, if the input password is correct, it is regarded as an authorized user, and an operation pattern is added to the operation pattern storage means 23 (steps 85 and 86).
On the other hand, if the password is invalid, it is regarded as a third party operation, and all the files inside the storage means 11 are deleted (step 87, step 88).
This makes it impossible for an unauthorized user to read information stored in the client 10.

When deleting a file, it is possible to prevent information leakage by deleting a file that is important information, but at the same time, important information is lost.
In the case of this embodiment, since the file stored in the client 10 is copied to the server 30, loss of information can be avoided.

(6) When the file update history is included in the difference file list In the above (1) to (5), the case where the file update history is not included in the difference file list has been described.
Here, an operation procedure when a file update history is included in the difference file list will be described.
Note that the initial setting and operation when the update history is included are the same as (1) and (2).

When a write request is made by the application 12 with the client 10 disconnected from the first network 41 and the file is updated under the permission of the file write control unit 19, the updated file is stored in the file list update unit. The file list and the difference file list are updated by the file list update means 18 (step 50 to step 55 in FIG. 10).
When the application 12 holds an update history, the information is also included in the difference file list.

The mail transmission means 16 transmits the difference file list created (updated) by the file list update means 18 to the server 30 as an electronic mail (step 56).
However, when the second network 42 is not connected and e-mail transmission is impossible, or when e-mail transmission is not possible due to other factors, the USB memory 50 is connected via the USB memory control means 21. The difference file list is copied (stored) to (step 57).

A case where the client 10 is lost in this state will be described.
The difference file list synchronization means 35 of the server 30 receives the email transmitted from the client 10 (step 58). Further, the USB memory control means 37 receives the difference file list from the USB memory 50 connected to the USB memory connection means 36 (step 59). This difference file list is sent to the difference file list synchronization means 35.
The difference file list synchronization means 35 updates the values of the asynchronous update date and time and the asynchronous size based on the update history included in the difference file list for the file information stored in the file list (see FIG. 7, step 60). ). As a result, it can be seen that the file stored in the storage unit 31 is out of synchronization with the file stored in the server 30.

The file list display means 38 can display the contents of the file list (step 61). As a result, the system administrator can refer to the information stored in the file list.
Although the file list stored in the storage means 31 is registered in the file list, the PC ID of the client 10 is searched from the file list on the screen of the file list display means 38 and stored in the client 10. You can display the information of the file that was saved.

In the file list, the storage location in the storage means 31 is registered in addition to the name and size of the file, so that the contents of the file can actually be referred to.
As for the file, it can be confirmed that the file of the client 10 and the server 30 are asynchronous, and the file can be confirmed to be synchronized.

[File management program]
Next, the file management program will be described.
The file management function (function for executing the file management method) of the computer (client, server, client server system) in the above embodiment is stored in a storage means (for example, ROM (Read only memory), hard disk, etc.). Realized by a file management program.

  When the file management program is read by a computer control means (CPU (Central Processing Unit), etc.), it sends commands to each component of the computer to perform predetermined processing, for example, connection monitoring processing of the connection monitoring means, file list comparison Means comparison processing, file upload means upload processing, write permission judgment means write permission judgment processing, mail transmission means mail transmission processing, differential file list synchronization means differential file list creation update processing, file list update means file list Creation update processing, write control processing of file write control means, write processing of USB memory control means, information transmission / reception processing of communication data management means of server, file list creation update processing of file list update means, differential file list synchronization Difference file of means A list creation / update process, a USB memory control means extraction process, and the like are performed.

  Thus, the file management function is realized by the cooperation of the file management program as software and each component of the computer (client, server, client server system) as hardware resources.

Note that a file management program for realizing the file management function is stored in a computer ROM, hard disk, or the like, or may be stored in a computer-readable recording medium such as an external storage device or a portable recording medium. it can.
The external storage device is a memory expansion device that incorporates a storage medium such as a CD-ROM (Compact disk-Read only memory) and is externally connected to a client or a server. On the other hand, the portable recording medium is a recording medium that can be mounted on a recording medium driving device (drive device) and is portable, and refers to, for example, a flexible disk, a memory card, a magneto-optical disk, and the like.

The program recorded on the recording medium is loaded into the RAM of the computer and executed by the CPU (control means). By this execution, the functions of the client and server of the above-described embodiment are realized.
Further, when a file management program is loaded by a computer, the file management program held by another computer can be downloaded to its own RAM (Random access memory) or an external storage device using a network. The downloaded file management program is also executed by the CPU, and realizes the file management function of the client or server of the above embodiment.

As described above, according to the client server system, the client computer, the server, the file management method, and the file management program of the present embodiment, the predetermined information such as the update date of the file stored in each of the client 10 and the server 30 Can be managed as a file list, and by comparing these, the presence / absence of update in the client 10 can be easily grasped.
This comparison is a comparison of file lists, not a comparison of actual files. That is, the comparison process is performed using a file list that has an overwhelmingly smaller amount of data than the actual file. For this reason, regardless of the data amount of the file, the comparison process can be quickly performed and the presence / absence of the update can be instantly grasped.

Further, if it is found as a result of the comparison that the file has been updated, only the updated file is transmitted to the server 30 instead of all the files stored in the client 10. For this reason, the amount of data transmission is minimized, and the synchronization process can be performed quickly.
Further, since the file update date and file size are managed as a file list, it is possible to easily grasp whether or not the file update is the latest by checking this file list.

Although the preferred embodiments of the client server system, client computer, server, file management method and file management program of the present invention have been described above, the client server system, client computer, server, file management method and file management program of the present invention have been described. It is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention.
For example, in the above-described embodiment, the client server system including one client and one server is shown. However, the client server system is not limited to one each, and a plurality of clients and servers may be provided.

  Since the present invention relates to file synchronization between a client and a server, the present invention can be used for a system including a client and a server.

It is a block diagram which shows the structure of the client server system in embodiment of this invention. It is a block diagram which shows the structure of the client in embodiment of this invention. It is a block diagram which shows the structure of the folder and file stored in the memory | storage means of a client. It is a graph which shows the structure of the file list produced with a client. It is a chart which shows the structure of a difference file list. It is a block diagram which shows the structure of the server in embodiment of this invention. It is a chart which shows the structure of the file list produced with a server. It is an operation | movement procedure figure which shows operation | movement (initial setting) of the client server system in embodiment of this invention. It is an operation | movement procedure diagram which shows the procedure of the operation | movement in the state in which the client was connected to the 1st network. It is an operation | movement procedure figure which shows the operation | movement operation | movement when a client is cut off from the 1st network. It is an operation | movement procedure figure which shows operation | movement when a client is again connected to a 1st network and communication with a server is attained. It is an operation | movement procedure figure which shows operation | movement when a person (third party) other than a regular user logs in illegally and tries to read the information inside a client when a client is lost. It is a block diagram which shows the structure of the memory | storage means of a server.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Client server system 10 Client 11 Storage means 12 Application 13 File list storage means 14 Data transmission / reception means 14-1 Connection monitoring means 14-2 File list comparison means 14-3 File upload means 15 Write permission judgment means 16 Mail transmission means 17 Difference File list synchronization means 18 File list update means 19 File write control means 20 USB memory connection means 21 USB memory control means 22 Operation detection means 23 Operation pattern storage means 24 Operation determination means 25 Password confirmation UI means 30 Server 31 Storage means 32 File List storage means 33 Communication data management means 34 File list update means 35 Differential file list synchronization means 36 USB memory connection means 37 USB memory control means 38 File list display means 41 First network 42 Second network 50 USB memory

Claims (21)

Client-side storage means for storing one or more files;
A client computer having client side file list updating means for creating predetermined information corresponding to each of the files stored in the client side storage means as a client file list;
Server-side storage means for storing one or more files;
Server-side file list update means for creating predetermined information corresponding to each of the files stored in the server-side storage means as a server file list;
A server computer having server-side transmission means for transmitting the server file list to the client computer,
The client computer is
File list comparison means for comparing the server file list transmitted from the server computer with the client file list;
When there is a difference between the server file list and the client file list, the client side transmission means for transmitting a file related to the difference to the server computer,
The server computer is
Server-side receiving means for receiving a file related to the difference;
The server-side storage unit stores a file related to the difference. As a result of the comparison by the file list comparison unit of the client computer, when there is a difference between the server file list and the client file list, the client side transmission unit determines whether the file is related to the difference. And the client file list to the server computer,
Server side receiving means of the server computer,
Receiving the file related to the difference and the file list for the client;
The client server system according to claim 1, wherein the server-side storage unit stores a file related to the difference and the client file list. The client computer has a creation means for creating the file,
The client server system according to claim 1, wherein the client side storage unit stores the file created by the creation unit. The client server system according to claim 1, wherein the predetermined information corresponding to the file includes update date / time data and / or file size data. The client server system according to claim 1, wherein the server computer includes display means for displaying the server file list. The client computer is
Update detection means for detecting that a file stored in the client-side storage means has been updated;
The client server system according to claim 1, wherein the client-side file list update unit updates the client file list when the update of the file is detected. The client server system according to any one of claims 1 to 6, wherein the client computer has mail transmission means for transmitting the client file list to the server computer by electronic mail. The client computer is
Connection monitoring means for determining whether or not data can be transmitted to and received from the server computer via a local communication network;
8. The client server system according to claim 7, wherein when the data cannot be transmitted / received through the local communication network, the mail transmission means transmits the client file list to the server computer by electronic mail. The client computer is
A recording medium connecting means to which a portable recording medium is connected;
The client server system according to claim 1, further comprising: a recording medium control unit that stores the file relating to the difference and / or the file list for the client in the recording medium. The client computer is
Connection monitoring means for determining whether data can be transmitted to and received from the server computer;
10. The client server system according to claim 9, wherein when the data cannot be transmitted / received, the recording medium control unit stores the file related to the difference and / or the file list for the client in the recording medium. . The client computer is
Operation pattern storage means for storing a user's operation pattern;
An operation determining means for comparing the executed operation with the operation pattern;
As a result of comparison, when the executed operation is different from the operation pattern, an authentication unit that performs user authentication;
11. The apparatus according to claim 1, further comprising: a file control unit that deletes a file stored in the client-side storage unit when it is determined that the user is not an authorized user as a result of the user authentication. The client server system according to any one of the above. Client-side storage means for storing one or more files;
Client-side file list updating means for creating predetermined information corresponding to each of the files as a client file list;
File list comparing means for comparing the server file list transmitted from the server computer with the client file list;
A client computer comprising: client side transmission means for transmitting a file related to the difference to the server computer when there is a difference between the server file list and the client file list. When there is a difference between the file list for the server and the file list for the client as a result of the comparison by the file list comparison means, the client side transmission means determines that the file related to the difference and the file for the client The client computer according to claim 12, wherein the file list is transmitted to the server computer. Server-side storage means for storing one or more files;
Server-side file list update means for creating predetermined information corresponding to each of the files as a server file list;
Server-side transmission means for transmitting the server file list to a client computer;
Receiving means for receiving a file related to the difference between the server file list and the client file list from the client computer;
The server computer, wherein the server-side storage unit stores a file related to the difference. The receiving means is
Receiving a file related to the difference between the server file list and the client file list, and the client file list;
The server computer according to claim 14, wherein the server-side storage unit stores a file related to the difference and the client file list. Processing for creating predetermined information corresponding to each file stored in the client-side storage means as a client file list;
Processing for creating predetermined information corresponding to each file stored in the server-side storage means as a server file list;
A process of comparing the server file list with the client file list;
When there is a difference between the server file list and the client file list, a process of transmitting a file related to the difference to a server computer;
The server-side storage means has a process of storing a file related to the difference. When there is a difference between the server file list and the client file list as a result of the comparison by the file list comparison unit of the client computer, the file related to the difference and the client file list Transmitting to the server computer;
The file management method according to claim 16, wherein the server-side storage unit includes a process of storing a file related to the difference and the file list for the client. Storing one or more files;
Processing for creating predetermined information corresponding to each of the files as a client file list;
A comparison process for comparing the server file list transmitted from the server computer with the client file list;
When there is a difference between the server file list and the client file list, the file management program causes the client computer to execute a process of transmitting a file related to the difference to the server computer. . When there is a difference between the server file list and the client file list as a result of the comparison process, a process of transmitting the file related to the difference and the client file list to the server computer The file management program according to claim 18, wherein the file is executed by the client computer. Processing for creating predetermined information corresponding to each file stored in the client-side storage means as a client file list;
Processing for creating predetermined information corresponding to each file stored in the server-side storage means as a server file list;
A process of comparing the server file list with the client file list;
When there is a difference between the server file list and the client file list, a process of transmitting a file related to the difference to a server computer;
A file management program that causes the server-side storage unit to execute a process of storing a file related to the difference. A file related to a difference between the server file list and the client file list, and a process of receiving the client file list from the client computer;
21. The file management program according to claim 20, wherein the server-side storage means causes the server computer to execute processing for storing the file related to the difference and the client file list.

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