JP2001051839A - Client / server system, control method thereof, and client terminal - Google Patents

Abstract

(57) [Problem] To provide a client / server system, a control method thereof, and a client terminal that do not need to be constantly connected and can minimize the communication amount. SOLUTION: A local proxy 22 and an application file storage DB 23 are provided in a client terminal 20, an application registered in an application management DB 13 of a server 10 is automatically downloaded by an automatic patrol program of the local proxy 22, and the application file storage DB 23 By saving and specifying the proxy setting in the local proxy 22, the application stored in the application file storage DB 23 can be executed from the Web browser 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a client-server system suitable for a mobile environment having a high communication cost and a small line capacity, a control method thereof, and a client terminal.

[0002]

2. Description of the Related Art Conventionally, WWW (World Wid)
There are many client / server systems using eWeb) technology and application programs therefor.

FIG. 1 schematically shows the operation of a conventional system of this type. In the figure, reference numeral 1 denotes a center (provider) -side device (server), 2 denotes a user-side device (client terminal), Reference numeral 3 denotes a communication line such as a telephone, a wireless telephone, and a LAN. The server 1 has a Web server program 11, and the client terminal 2 has a Web browser program 21.

[0004] In the above configuration, data update in a Web application program (not shown) operating on the Web browser program 21 of the client terminal 2 is performed by the Web browser program 21 of the client terminal 2 by acquiring a page via the communication line 3. The query is sent to the Web server program 11 of the server 1, and the Web server program 11 transfers a corresponding Web page to the Web browser program 21.

Similarly, in order to input data for reflecting data in the server 1, the Web browser program 21 of the client terminal 2 sends a data input query to the Web server program 11 of the server 1 via the communication line 3. , By transferring a Web page corresponding to the Web server program 11 to the Web browser program 21.

Since requests for updating, inputting, and deleting data in the Web application program occur at irregular intervals, it is necessary that information can always be exchanged between the server and the client terminal. It was necessary to make it possible (line connection state).

[0007]

Accordingly, such a conventional system has the following problems. 1) It is necessary to always exchange information between the client and the server, and it is necessary to always connect during use. 2) Since the client always refers to the server information,
High communication traffic. 3) For the reasons 1) and 2), when the always-on type packet communication is used, the communication fee increases due to the communication traffic. 4) Due to the reasons 1) and 2), when using outdoors by using a wireless telephone, as in a mobile environment, the communication fee increases. 5) For the reasons 1) and 2), when the capacity of the communication line is small as in a mobile environment, it takes time until a necessary screen is displayed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a client / client system which does not need to be constantly connected and can minimize the amount of communication, and in particular, can make a Web application running on a Web browser available without performing communication. A server system, a control method thereof, and a client terminal are provided.

[0009]

In order to achieve the above object, according to the present invention, a function for automatically downloading a Web application running on a Web browser to a client terminal is provided. A function for executing a Web application and a Web application
b. It has a function of retaining data input by the application in the client terminal and a function of communicating with the server only when the data is reflected on the server.

FIG. 2 shows the overall configuration of a client / server system according to the present invention. In FIG.
0 is a client terminal, and 30 is a communication line.

Here, the server 10 comprises a Web server program 11, a business system program 12, an application management database (DB) 13, and a remote access server (RAS) 14. A browser program 21;
It includes a local proxy (proxy server) 22, an application file storage database (DB) 23, and a remote access server (RAS) 24. The communication line 30 is composed of a general public line (including a mobile phone line) 31 and a LAN 32 here.

The remote access servers 14 and 2
Reference numeral 4 is for connecting computers at remote locations via a general public line to create an environment similar to LAN connection.

FIG. 3 shows an outline of the operation of the client-server system of the present invention, and the operation will be described below together with the configuration.

That is, by automatically downloading a Web application running on a Web browser to the client terminal 20 and installing a software function (automatic patrol program) for managing the Web application, the server 10 can be pre-configured in a LAN environment. The Web application program registered in the application management DB 13 is automatically downloaded to the application file storage DB 23 of the client terminal 20, and a new Web application is added, unnecessary Web applications are deleted, and an old Web application is upgraded automatically. To run.

In the local proxy 22 installed in the client terminal 20, the proxy setting of the Web browser is set in the local proxy 22 in advance, and when the worker uses the Web application from the Web browser 21, Then, the downloaded Web application is executed and displayed in the application file storage DB 23 of the client terminal 20 via the local proxy 22. As a result, the Web application can be executed without performing communication with the server 10.

Further, by using a cookie function (a function of grasping information of a person who is connected to the homepage) provided as a standard feature in the Web browser 21, the
b All data input by application is We
It can be stored in the cookie file of the b browser 21. As a result, the Web operating on the Web browser 21
b. Data input to the application can be performed without communication with the server 10, and business can be performed on the client terminal 20 even when communication with the server 10 is not performed.

Further, there is provided a method for temporarily storing data in a frame document of a Web page.

Further, since communication with the server 10 is performed only when data input at the client terminal 20 is reflected on the server 10, the local proxy 22 communicates with the server 10 when a specific command is received from the Web browser 21. It has the function to open the communication path. Thereby, communication with the server 10 can be automatically performed without making the user aware, and business can be performed at the minimum necessary communication cost.

The work data uses the cookie function of the Web browser 21.
The file is not encrypted, and data can be falsified by directly editing the cookie file.
Therefore, by installing a Web application having a function of performing encryption when writing to a cookie file and decrypting when reading the cookie file and using this application, data reliability can be obtained.

FIG. 4 shows a state transition diagram of the system of the present invention.

According to the present invention, business can be performed on a client terminal even when a Web application running on a Web browser is not completely communicating.
Also, when data is reflected on the server, only the necessary minimum communication is performed, so that the communication cost can be reduced.

As described above, by using the present invention, a Web application can be executed in a mobile environment.

[0023]

[First Embodiment] FIG. 5 shows a mechanism for downloading a Web application operating on a Web browser to a client terminal. 1. The client terminal 20 is equipped with a Web browser 21 and a local proxy 22 having an automatic patrol program. 2. Web registered in server 10 in LAN environment
The application performs automatic download by the automatic patrol program of the local proxy 22 (41). 3. The downloaded Web application is registered in the application file storage DB 23. 4. The automatic patrol trigger can be manually started or automatically started by a timer. 5. By specifying the local proxy 22 by setting the proxy from the Web browser 21, the downloaded Web application can be executed.

[Embodiment 2] FIG. 6 shows a mechanism for executing a Web application running on a Web browser offline. 1. The local proxy 22 is specified from the Web browser 21 of the client terminal 20 by setting the proxy. 2. When a URL is designated from the Web browser 21 to display an application, a GET query or a HEAD query of a data acquisition query is sent to the local proxy 22 together with the URL (51). 3. The local proxy 22 that has received the data acquisition query of the GET query or the HEAD query transfers a Web page that matches the URL from the application file storage DB 23 to the Web browser 21 (5).
2). 4. The Web browser 21 displays the page 53 returned by the local proxy 22. When viewed from the Web browser 21, the page of the server appears to be displayed, but is not actually connected to the server, and the application is executed in an offline state. 5. The business data input on the application is W
cookie provided as standard in the web browser 21
Stored in function or frame variables. 6. Business data for performing business is HT of order information
Open the ML page to open the cookie file 54
(55). 7. The data input performed by the client terminal 20 is performed by using the Web downloaded to the local proxy 22 in advance.
Done by the application. At this time, if the Web application refers to the business data, the cook
Reference is made from the IE file 54 (56). 8. All the processes during this period can be operated in an offline state, and a Web application that operates on a locally operated Web browser without extending the Web browser is realized.

[Embodiment 3] FIG. 7 shows a mechanism for reflecting data input by a Web application running on a Web browser on a server. 1. The local proxy 22 is specified from the Web browser 21 of the client terminal 20 by setting the proxy. 2. Data input is performed by the offline Web application. 3. W to reflect the input data to server 10
From an application running on the web browser 21, a POST query or P
The UT query is sent to the local proxy 22 (6
1). 4. Local proxy 22 sends P from Web browser 21
When receiving an OST query or PUT query,
The local proxy 22 automatically determines whether the client terminal 20 is online or offline. At this time, if it is online, a query is directly executed to the server 10 (62). In the offline state, the communication line (here, the general public line 31) of the communication device connected to the client terminal 20 is automatically opened by the automatic connection program, and the server 10
Make a direct connection to the server and query the server directly. 5. As a result, the data can be reflected without the user being conscious of the operation of the communication device.

[Embodiment 4] FIG. 8 shows a secure authentication mechanism using a cookie. 1. The client terminal 20 requests user authentication to the user authentication (program) module 15 of the server 10. At this time, the user himself inputs his user name and password (71). 2. When user authentication is accepted, it is encrypted,
User name and password with expiration date etc
It is registered in the kie file 72 (73). 3. Subsequent user authentication is performed by referring to the cookie file 72. This eliminates the need for the user to re-enter the authentication data, and the authentication can be performed safely.

[Fifth Embodiment] FIG. 9 shows a mechanism for preventing leakage of business data by encrypting cookie data. 1. The business data is stored in a cookie file 81 provided as a standard feature in the Web browser 21. 2. The business data for performing the business is H in the order information.
Open cookie file 8 by opening TML page
Written to 1. At this time, the business data is encrypted by the encryption program 82 embedded in the HTML page and written to the cookie file 81 (83). 3. Thus, even if the client terminal 20 is stolen, the leakage of business data can be prevented.

[0028]

As described above, according to the present invention,
A Web application that runs on a Web browser can be used without performing communication with a Web server. As a result, the following effects can be obtained. 1) A Web application running on a Web browser can be executed without communicating with a server. 2) The application communicates only when the input information is reflected on the server. 3) It has a function of automatically setting a communication path when performing the above communication. 4) The above makes it possible to minimize the communication cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of the operation of a conventional client-server system.

FIG. 2 is an overall configuration diagram of a client server system of the present invention.

FIG. 3 is a diagram showing an outline of the operation of the client server system of the present invention.

FIG. 4 is a state transition diagram of the system of the present invention.

FIG. 5 is a diagram showing a mechanism for downloading a Web application to a client terminal.

FIG. 6 is a diagram illustrating a mechanism for executing a Web application offline.

FIG. 7 is a diagram showing a mechanism for reflecting data input by a Web application on a server;

FIG. 8 is a diagram showing a mechanism of secure authentication using a cookie.

FIG. 9 is a diagram showing a mechanism for preventing leakage of business data by encrypting cookie data;

[Explanation of symbols]

10: server, 11: Web server program, 12:
Business system program, 13: application management database, 14: remote access server, 15:
User authentication module, 20: client terminal, 2
1: Web browser program, 22: Local proxy, 23: Application file storage database, 24: Remote access server, 30: Communication line,
54, 72, 81: cookie files.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masanori Okubo 2-3-1 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (72) Inventor Nobuo Kuwaki 2-3-3, Otemachi, Chiyoda-ku, Tokyo No. 1 F-term in Nippon Telegraph and Telephone Corporation (reference) 5B076 AA03 AB20 BB06 5B085 AE29 BG07 CA04 CC17 5B089 GA21 GB03 GB04 GB09 HA01 JA12 JA22 JA23 JB07 KA08 KA16 KB07 KC28 KC51

Claims (10)

[Claims] 1. A server provided with a Web server program, a client terminal provided with a Web browser program, and a communication line for connecting these, and a business is performed using a Web application program operating on the Web browser program. In a client-server system, a client terminal is provided with a local proxy having a function of automatically downloading a Web application program and an application file storage database. Automatically downloads to the client terminal and saves the downloaded Web application program in the application file storage database. Web browser in the application file storage database via a local proxy from a Web browser program
A client-server system for executing an application program. 2. The local proxy automatically downloads a web application program, adds a new web application program,
2. The client server system according to claim 1, further comprising a function of automatically deleting unnecessary Web application programs and automatically upgrading old Web application programs. 3. The client terminal according to claim 1, wherein information in a server required for business by the Web application program is held in the client terminal by using a data holding function in the Web browser program. Server system. 4. The client server according to claim 1, wherein the input data for the business by the Web application program is held in the client terminal by using a data holding function in the Web browser program. system. 5. The client-server system according to claim 4, wherein the local proxy has a function of communicating with the server only when the input data is reflected on the server or the entire system. 6. The local proxy has an automatic connection function corresponding to a general public line.
The client-server system as described. 7. A server provided with a Web server program, a client terminal provided with a Web browser program, and a communication line connecting these, and a business is performed using a Web application program operating on the Web browser program. A method for controlling a client-server system, comprising: downloading a Web application program registered in a server by a local proxy of a client terminal; storing the downloaded Web application program in an application file storage database of the client terminal; Executing a Web application program in an application file storage database by setting a proxy that specifies a local proxy of the application Control method of the client / server system. 8. A Web browser program sends a data acquisition query to the local proxy together with the specification of a URL, and the local proxy transfers a Web page matching the URL from the Web application program in the application file storage database to the Web browser program. The method according to claim 7, wherein the Web browser program displays the transferred Web page. 9. A data input query is sent to a local proxy from a Web application program on a Web browser program, and the local proxy executes the data input query as it is when the client terminal is online, and automatically connects when the client terminal is offline. 9. The method according to claim 7, wherein the data input query is executed by executing the data input query. 10. A web browser program, comprising:
A client terminal in a client-server system that performs a job using a Web application program that runs on a Web browser program, a local proxy that has a function of automatically downloading the Web application program, and that runs on a Web browser program A client terminal comprising: an application file storage database for storing a Web application program to be executed.