JP2003345690A - Network communication system and network communication method - Google Patents

Abstract

(57) [Summary] [Problem] To pass information from a Web client to a Web server by a simple method. SOLUTION: A control device 3 having a Web server 4;
The controlled device 2 having the Web client 5 is connected via the network 1, and when the controlled device 2 returns a response when receiving information from the control device 3, the controlled device 2 uses a plurality of resources of the control device 3. The URL information corresponding to the response content is extracted based on the correspondence information between each of the URL information indicated and the response message, and Web
b, the control device 3 accesses the URL indicating the plurality of resources of the control device 3 when the access is made based on the URL information.
Based on the correspondence information between each information and the response message,
A response message corresponding to the URL information is received.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network communication system in which a first device having a Web server function and a second device having a Web client function are connected via a network, and to the communication system. The present invention relates to a network communication method to be used.

[0002]

2. Description of the Related Art Conventionally, various network communication systems using a Web server and a Web client have been provided.
As a system that enables control using an web server and a web client, there is a technique described in JP-A-2001-154953.

[0003] The technology disclosed in the above publication is as follows. In a system that is divided by a firewall and allows access from the internal network to the external network, but does not allow access in the opposite direction, a Web client is placed in the internal network and
Place the server on an external network.

[0004] As shown in FIG. 8, the Web client periodically accesses the Web server to obtain control data from the Web server (S81). Upon receiving this access, the Web server sends a control request (control data) together with a response to the Web client (S82).

[0005] The Web client controls the control target using the control data, and sends a control response as a result in addition to the access to the Web server (S83).

[0006]

As described above, in the conventional network communication system, when information is passed from a Web client to a Web server, it is necessary to send the information in addition to the access to the Web server.

[0007] The present invention has been made in view of the current situation of the conventional network communication system as described above, and an object thereof is to enable a simpler method than in the past when information is passed from a Web client to a Web server. A network communication system and a network communication method are provided.

[0008]

A network communication system according to the present invention is a network communication system in which a first device having a Web server function and a second device having a Web client function are connected via a network. In the system, when the second device returns a response when receiving the information from the first device, correspondence information between each URL information indicating a plurality of resources of the first device and a response message URL information corresponding to the response content is extracted based on the
The first device accesses the URL information based on the correspondence information between each URL information indicating a plurality of resources of the first device and a response message when the access is received based on the URL information. Receiving a response message to be sent.

In the network communication system according to the present invention, the first device and the second device each have a table in which a response message is associated with each URL information indicating a plurality of resources of the first device. It is characterized by being provided.

In the network communication system according to the present invention, a firewall is provided between the first device and the second device, and the second device is provided inside the firewall. Features.

In the network communication system according to the present invention, the first device is a control device, the second device is a controlled device, and the second device is controlled by the first device. When a response message is sent, the URL information corresponding to the response content is extracted by referring to the correspondence relationship information between the URL information indicating the plurality of resources of the first device and the response message, and the URL is accessed based on the URL information. It is characterized by the following.

[0012] The network communication method according to the present invention comprises:
When a first device having an web server function and a second device having a web client function are connected via a network, and the first device and the second device communicate with each other via the network In the network communication method, the second device receives information from the first device, and when returning a response to the received information, the second device includes, for each URL information indicating a plurality of resources of the first device, A step of extracting URL information corresponding to the response content based on the correspondence information with the response message, a step of accessing with the extracted URL information,
Receiving the returned URL information, and responding to the received URL information based on correspondence information between each URL information indicating a plurality of resources of the first device and a response message. And converting the message into a message.

[0013] The network communication method according to the present invention is characterized in that a firewall is provided between the first device and the second device, and the second device is provided inside the firewall. It is characterized by being performed.

In the network communication method according to the present invention, the first device is a control device, the second device is a controlled device, and the second device is controlled by the first device. When a response message is sent in response to a response message, the URL corresponding to the response content is determined based on correspondence information between each URL information indicating a plurality of resources of the first device and the response message.
A step of extracting information and a step of accessing with the URL information are executed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a network communication system and a network communication method according to the present invention will be described below with reference to the accompanying drawings. In the network communication system according to the present invention, a controlled device 2 and a control device 3 are connected to a network 1 as shown in FIG. The controlled device 2 and the control device 3 are both configured as personal computers, workstations, and other computers, and include the components shown in FIG.

That is, the computer shown in FIG. 3 has a CPU 51 for overall control of the apparatus.
A main storage device 52 in which information such as a program and data used by 51 is stored is connected. Further, the CPU 51
The keyboard control unit 5 via the system bus 53
4. The display controller 55, the printer controller 56, the communication interface 57, the mouse controller 58, and the magnetic disk controller 59 are connected. The keyboard control unit 54 is connected with a keyboard input device 60 capable of inputting various information by keys, the display control unit 55 is connected with a CRT display device 61 for displaying information, and the printer control unit 56 is printed with information. A printer device 62 for outputting is connected, and a communication processing unit 63 for performing communication by connecting to the network 1 via a line is connected to the communication interface 57.
The mouse control unit 58 is connected to a mouse 64 as a pointing device, and the magnetic disk control unit 59 is connected to a magnetic disk device 65 as an auxiliary storage device. Further, a flexible disk drive, a magnetic card or IC card reader, an MO (magneto-optical disk) drive and the like are provided as needed.

The controlled device 2 has software We
b client 5 is provided, and the control device 3 is provided with a Web server 4 which is software. From the Web client 5, a URL (Uniform Resource Locato
r) allows access to the Web server 4.

The Web server 4 accessed by the URL sends a control request (control data) in response to the URL.
b Return to client 5. The control data is control data (or a program) as shown in FIG. 2 for the control device 2 to perform control based on the control data, and includes a table 8. The control data is transmitted from the control device 2 in FIG.
Is data that is configured to be able to retrieve files held by the controlled device 2 and perform any control on the controlled device 2 by performing control based on the control data (or program) shown in FIG. .

The control data also has a part (program) for performing processing for communicating the control result to the Web server 4, and by executing this program, the result of the processing based on the control data is obtained. Based on the table 8, a corresponding URL is extracted and transmitted to the control device 3. That is, if the result of the control processing is normally completed, the URL information “http: // ww
w.xxx.com/ok ”, and if the result of the control processing is a certain type of control abnormality 1 (for example, no control was performed), the URL information“ http://www.xxx.com/ ng1 ”, the result of the control processing is a certain kind of control abnormality 2
(For example, if some control was not performed), U
Accessed by the RL information “http://www.xxx.com/ng2”,..., Etc., the table 8 includes a plurality of resources (such as ok, ng1, ng2, etc. A response message (here, a processing result) is associated with each piece of URL information that indicates a directory or the like, but does not have to actually exist as a resource.

On the other hand, the control device 3 includes a response reception processing unit 6 for accessing the URL corresponding to the result of the control processing to identify the content, and a table 7 having the same storage content as the table 8. Is provided. The response reception processing unit 6 performs, based on the above-mentioned table 7 in which the correspondence information between each URL information indicating a plurality of resources of the control device 3 and the response message is stored when the access based on the URL information is made. A response message corresponding to the URL information is received.

The operation of the network communication system configured as described above will be described with reference to FIGS. FIG. 4 shows the operation in the case of normal termination. W
The web client 5 is, for example, periodically a web server 4
Is accessed (S1). In response to this, a control request (control data) is returned to the Web client 5 in response (S2).

In response to the control data, the controlled device 2 performs the corresponding control (S3), obtains the result of the control processing, and detects that the control has been completed normally (S4). Therefore, the controlled device 2 obtains URL information “http://www.xxx.com/ok” corresponding to the normal end from the table 8, and
Web access is performed by this (S5).

In the control device 3, the URL information "http: //www.x
xx.com/ok ”, the corresponding normal termination message is identified by referring to Table 7 (S6).
For example, a response is returned to the controlled device 2 by displaying it on the CRT display device 61 (S7). Thus, the control device 3 can detect that the control has been normally completed in the controlled device 2 by receiving access by the URL information “http://www.xxx.com/ok”.

FIG. 5 shows the operation when control abnormality 1 occurs. For example, the Web client 5 periodically accesses the Web server 4 (S1), and in response to this, the Web server 4 responds by sending a control request (control data).
Is returned to the Web client 5 (S2).

In response to the control data, the controlled device 2 performs the corresponding control (S3), obtains the result of the control processing, and detects that control abnormality 1 has occurred (S4A).
Therefore, the controlled device 2 sets the URL corresponding to the control abnormality 1
The information "http://www.xxx.com/ng1" is obtained from Table 8, and Web access is performed based on the information (S5A).

In the control device 3, the URL information "http: //www.x
xx.com/ng1 ”, the corresponding control error 1 message is identified with reference to Table 7 (S6
A), for example, display on the CRT display device 61, and further return a response to the controlled device 2 (S7). Thus, the control device 3 can detect the occurrence of the control abnormality 1 in the controlled device 2 by receiving the access using the URL information “http://www.xxx.com/ng1”.

FIG. 6 shows the operation when the control abnormality 2 occurs. For example, the Web client 5 periodically accesses the Web server 4 (S1), and in response to this, the Web server 4 responds by sending a control request (control data).
Is returned to the Web client 5 (S2).

In response to the control data, the controlled device 2 performs corresponding control (S3), obtains the result of the control processing, and detects that control abnormality 2 has occurred (S4B).
Therefore, the controlled device 2 sets the URL corresponding to the control abnormality 2
The information "http://www.xxx.com/ng2" is obtained from Table 8, and Web access is performed based on the information (S5B).

In the control device 3, the URL information "http: //www.x
xx.com/ng2 ”, the corresponding control error 2 message is identified by referring to Table 7 (S6
B), for example, display on the CRT display device 61, and further return a response to the controlled device 2 (S7). Thus, the control device 3 can detect that the control abnormality 2 has occurred in the controlled device 2 by receiving access by the URL information “http://www.xxx.com/ng2”.

FIG. 7 shows the network communication system of FIG. 1 in which a firewall 9 is provided between the network 1 and the controlled device 2, and the controlled device 2 is provided inside the firewall 9. In other words, this is a system in which the Web client 5 of the controlled device 2 accesses the Web server 4 and controls the controlled device 2 in response. With such a configuration,
The controlled device 2 by the network communication method according to the present invention
Can return a response message.

In the above embodiment, the response to the control corresponds to the URL. However, the response to the control is not limited to the response to the control. The URL corresponding to the case where a desired response is returned when any information is received. By performing the access according to, the response content can be identified.

[0032]

As described above, according to the present invention, when the second device returns a response when receiving the information from the first device, the URL indicating the plurality of resources of the first device is used. URL information corresponding to the response content is extracted based on the correspondence information between each information and the response message, and the UR
The first device accesses the web based on the L information,
When the access message is received, the response message corresponding to the URL information is received based on the correspondence information between each URL information indicating the plurality of resources of the first device and the response message. Therefore, only the URL information is used. Thus, it is possible to return a response message from the second device to the first device.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a network communication system according to the present invention.

FIG. 2 is a diagram showing contents of control data sent by a Web server in the network communication system according to the present invention.

FIG. 3 is a block diagram of a computer constituting a control device and a controlled device used in the network communication system according to the present invention.

FIG. 4 is a diagram showing a communication sequence when control is normally completed in a controlled device of the network communication system according to the present invention.

FIG. 5 is a diagram showing a communication sequence when a control abnormality 1 occurs in a controlled device of the network communication system according to the present invention.

FIG. 6 is a diagram showing a communication sequence when a control abnormality 2 occurs in a controlled device of the network communication system according to the present invention.

FIG. 7 is a configuration diagram of a network communication system according to the present invention provided with a firewall.

FIG. 8 is a diagram showing a communication sequence in a conventional network communication system.

[Explanation of symbols]

1 Network 2 controlled device 3 Control device 4 Web server 5 Web client 6 Response reception processing unit 7, 8 tables 9 Firewall

Claims (7)

[Claims] 1. A first device having a Web server function and a second device having a Web client function,
In a network communication system connected via a network, when the second device returns a response when receiving information from the first device, URL information indicating a plurality of resources of the first device. URL information corresponding to the response content is retrieved based on the correspondence relationship information between each and the response message, and Web access is performed using the URL information. The first device is configured to perform the first access when the access is performed based on the URL information. Based on correspondence information between each URL information indicating a plurality of resources of the device and the response message,
A network communication system receiving a response message corresponding to RL information. 2. The first device and the second device,
The network communication system according to claim 1, further comprising a table in which a response message is associated with each piece of URL information indicating a plurality of resources of the first device. 3. The device according to claim 1, wherein a firewall is provided between the first device and the second device, and the second device is provided inside the firewall. A network communication system as described. 4. A method according to claim 1, wherein said first device is a control device, said second device is a controlled device, and said second device sends a response message to control by said first device. And retrieving URL information corresponding to the response content by referring to correspondence information between each URL information indicating a plurality of resources of the first device and the response message, and accessing the URL information based on the URL information. 2. The network communication system according to 1. 5. A first device having a Web server function and a second device having a Web client function are connected via a network, and the first device and the second device are connected via a network. In the network communication method for performing communication, the second device receives information from the first device, and, when returning a response to the received information, uses a plurality of resources of the first device. A step of extracting URL information corresponding to the response content based on the correspondence information between each of the URL information and the response message, a step of accessing by the extracted URL information, and a step in which the first device returns the returned URL Receiving information based on correspondence information between each URL information indicating a plurality of resources of the first device and a response message. Network communication method characterized in that it is constituted by a step of converting the response message corresponding to the URL information taken. 6. A firewall is provided between the first device and the second device, and is performed when the second device is provided inside the firewall. The network communication method according to claim 5. 7. The method according to claim 1, wherein said first device is a control device, said second device is a controlled device, and said second device sends a response message to control by said first device. Extracting the URL information corresponding to the response content based on the correspondence information between each URL information indicating a plurality of resources of the first device and the response message, and executing the step of accessing based on the URL information. The network communication method according to claim 4, wherein: