CN107070978B - Method and system for cross-network proxy Web map service and proxy server - Google Patents

Method and system for cross-network proxy Web map service and proxy server Download PDF

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Publication number
CN107070978B
CN107070978B CN201710032462.5A CN201710032462A CN107070978B CN 107070978 B CN107070978 B CN 107070978B CN 201710032462 A CN201710032462 A CN 201710032462A CN 107070978 B CN107070978 B CN 107070978B
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server
request
wms
proxy server
client
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CN107070978A (en
Inventor
袁晓娟
陈启志
郭彦义
葛洁
王恺
王燕
汤希娟
张彦蕾
李雪莲
耿悦
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North China Institute Of Computer Technology (cetc No15 Research Institute)
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North China Institute Of Computer Technology (cetc No15 Research Institute)
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/51—Discovery or management thereof, e.g. service location protocol [SLP] or web services
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/29—Geographical information databases
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/565—Conversion or adaptation of application format or content

Abstract

The method comprises the steps that a proxy server forwards a GetCapabilites request sent by a client to a WMS server side and receives a metadata description document from the WMS server side, the proxy server modifies a UR L address field of the WMS server side contained in the metadata description document into a first UR L address field of the proxy server and sends the modified metadata description document to the client, the proxy server forwards the GetMap request sent by the client to the WMS server side and acquires a map from the WMS server side, wherein the GetMap request is calculated by the client according to the modified metadata description document.

Description

Method and system for cross-network proxy Web map service and proxy server
Technical Field
The invention relates to the technical field of WMS (Web map service) access, in particular to a method, a system and a proxy server for cross-network proxy Web map service.
Background
In the field of spatial data interoperability, an interoperability method based on a common interface access mode is a basic operation method. An interface specification of spatial data interoperability is formulated by an international standardization organization (such as ISO/TC211) or a technical alliance (such as OGC), GIS (geographic information system) software vendors develop a read-write function of spatial data conforming to the interface specification, and the interoperability of a heterogeneous spatial database can be realized. OGC (open geospatial information consortium) defines three georeferenced information models: WMS (Web map service), WFS (Web element service), WCS (Web geographic overlay service).
The WMS can return a map in a corresponding format according to a request of a user, such as grid forms of PNG, GIF, JPEG and the like or vector forms of SVG, WEB CGM and the like, the WMS supports a network protocol HTTP, and the supported operation is defined by UR L.
In recent years, with the development of geographic information, electronic maps are more and more widely used, and Web map services based on the OGC standard are also widely used. In many cases, it is necessary to proxy the Web map service from the a-network to the B-network so that the Web map service in the a-network can be accessed in the B-network. However, there is no method or system for cross-Web proxy for Web map services in the prior art. In addition, existing proxy server tools such as Apache and Wingate cannot realize cross-network proxy Web map services.
In view of this, a method and a system for implementing a cross-network proxy Web map service are needed to meet the demand of the cross-network proxy Web map service. In addition, a proxy server capable of implementing cross-network proxy Web map service is needed to overcome the defect that the existing proxy tool cannot perform cross-network proxy on the Web map service.
Disclosure of Invention
The invention aims to provide a method and a system capable of realizing cross-network proxy WMS map service so as to meet the requirement of cross-network proxy Web map service. In addition, the invention also aims to provide a proxy server to overcome the defect that the existing proxy server tool cannot realize cross-network proxy Web map service.
The invention provides a method for cross-network proxy Web map service, which comprises the following steps:
s1, the proxy server forwards the GetCapabilities request sent by the client to the WMS server, and receives the metadata description document from the WMS server;
s2, the proxy server modifies the UR L address field of the WMS server side contained in the metadata description document into a first UR L address field of the proxy server, and sends the modified metadata description document to the client side;
s3, the proxy server forwards the GetMap request sent by the client to the WMS server, and acquires a map from the WMS server;
and the GetMap request is calculated by the client according to the modified metadata description document.
Preferably, the first UR L address field includes the first IP of the proxy server and the first port number of the proxy server, and the UR L address field of the WMS server includes the IP of the WMS server and the port number of the WMS server.
Preferably, in step S1, the forwarding, by the proxy server, the GetCapabilities request sent by the client to the WMS server includes:
s11, the proxy server receives a GetCapabilities request sent by the client;
s12, the proxy server modifies the first UR L address field of the proxy server carried by the GetCapabilities request into a UR L address field of the WMS server;
and S13, the proxy server sends the modified GetCapabilities request to the WMS server.
Preferably, in step S3, the forwarding, by the proxy server, the GetMap request to the WMS server includes:
s31, the proxy server receives a GetMap request sent by the client;
s32, the proxy server modifies the first UR L address field of the proxy server carried by the GetMap request into a UR L address field of the WMS server end;
and S33, the proxy server sends the modified GetMap request to the WMS server.
Preferably, the method further comprises the steps of: the proxy server monitors the connection request sent by the client; the connection request includes: GetCapabilities request, GetMap request.
The invention also provides a system for cross-network proxy Web map service, which comprises:
the client is used for sending a GetCapabilities request to the proxy server, calculating a GetMap request to be sent according to the received modified metadata description document, and sending the GetMap request to the proxy server;
the proxy server is used for forwarding the GetCapabilities request to the WMS server, receiving the metadata description document from the WMS server, modifying the UR L address field of the WMS server contained in the metadata description document into a first UR L address field of the proxy server, sending the modified metadata description document to the client, and forwarding the GetMap request to the WMS server;
and the WMS server side is used for sending the metadata description document to the proxy server after receiving the GetCapabilities request and is also used for sending the map to the proxy server after receiving the GetMap request.
Preferably, the first UR L address field includes the first IP of the proxy server and the first port number of the proxy server, and the UR L address field of the WMS server includes the IP of the WMS server and the port number of the WMS server.
Preferably, the proxy server forwards the GetCaabilities request to the WMS server, and specifically comprises the steps that the proxy server receives the GetCaabilities request sent by the client, modifies a first UR L address field of the proxy server carried by the GetCaabilities request into a UR L address field of the WMS server, and sends the modified GetCaabilities request to the WMS server;
the proxy server forwards the GetMap request to a WMS server side, and specifically comprises the steps that the proxy server receives the GetMap request sent by a client side, modifies a first UR L address field of the proxy server carried by the GetMap request into a UR L address field of the WMS server side, and sends the modified GetMap request to the WMS server side.
Preferably, the proxy server is further configured to monitor a connection request sent by the client; the connection request includes: GetCapabilities request, GetMap request.
The present invention also provides a proxy server, comprising:
the monitoring module is used for monitoring the connection request sent by the client; the connection request includes: GetCapabilities request and GetMap request;
the first transceiving module is used for receiving a GetCapabilities request sent by a client and sending the modified metadata description document to the client; the system is also used for receiving a GetMap request sent by the client and sending the map received from the WMS server to the client;
the connection request analysis module is used for modifying the first UR L address field of the proxy server carried by the GetCapabilities request and the GetMap request into a UR L address field of the WMS server side;
the second transceiving module is used for sending the modified GetCapabilities request to the WMS server and receiving the metadata description document sent by the WMS server; the terminal is also used for sending the modified GetMap request to the WMS server and receiving the map sent by the WMS server;
and the metadata analysis module is used for modifying the UR L address field of the WMS server side contained in the received metadata description document into the first UR L address field of the proxy server.
According to the technical scheme, the invention provides a method, a system and a proxy server for cross-network proxy Web map service, wherein the method mainly comprises the steps that the proxy server forwards a GetCapabilities request sent by a client to a WMS server side and receives a metadata description document from the WMS server side, the proxy server modifies a UR L address field of the WMS server side contained in the metadata description document into a first UR L address field of the proxy server and sends the modified metadata description document to the client, the client calculates a GetMap request to be sent according to the modified metadata description document and forwards the GetMap request to the WMS server side through the proxy server so as to obtain a map from the WMS server side.
Drawings
The features and advantages of the present invention will become more readily appreciated from the detailed description section provided below with reference to the drawings, in which:
FIG. 1 is a schematic diagram of a method for cross-network proxy Web map service in an embodiment of the invention;
fig. 2 is a schematic diagram illustrating a method for forwarding a GetCapabilities request by a proxy server according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a method for forwarding a GetMap request by a proxy server according to an embodiment of the present invention;
FIG. 4 is a block diagram of a system for cross-Web proxy Web map services in an embodiment of the present invention;
FIG. 5 is a block diagram of the internal components of a proxy server in an embodiment of the invention;
1. a client; 2. a proxy server; 3. a WMS server side; 201. a first transceiver module; 202. a connection request parsing module; 203. a second transceiver module; 204. a metadata parsing module; 205. and a monitoring module.
Detailed Description
In many cases, it is necessary to proxy the Web map service from the a-network to the B-network and then access the Web map service on the B-network. However, there is no effective solution in the prior art as to how to implement a cross-Web proxy Web map service. In addition, the existing proxy server tools such as Apache and Wingate cannot meet the use requirements of the cross-network proxy WMS map service. In view of this, the inventor of the present invention proposes a method and a system for cross-network proxy Web map service, and a proxy server for implementing the cross-network proxy Web map service.
The technical scheme of the invention is explained in detail with reference to the accompanying drawings 1-4 and specific embodiments.
Fig. 1 is a schematic diagram illustrating a method for cross-network proxy Web map service according to an embodiment of the present invention. Before introducing the method for cross-network proxy Web map service, a description is first given of a network architecture related to the method. The network architecture in the embodiment of the invention can comprise a client, a proxy server and a WMS server, and the client and the WMS server are positioned in different network environments. For example, the client is located in a-network, and the WMS server is located in a-network. The method depicted in fig. 1 is described from the proxy server side. As can be seen from FIG. 1, the method mainly comprises steps S1-S3. In this embodiment, step S0 is preferably included before step S1.
Step S0, the proxy server listens for the connection request sent by the client. Wherein the connection request comprises: GetCapabilities request, GetMap request.
Specifically, when the connection request is a GetCapabilities request, the process proceeds to step S1; when the snoop request is a GetMap request, the process proceeds to step S3.
Step S1, the proxy server forwards the GetCapabilities request sent by the client to the WMS server, and receives the metadata description document from the WMS server.
Fig. 2 illustrates a preferred embodiment of the proxy server forwarding the GetCapabilities request. As can be seen from fig. 2, the proxy server forwards the GetCapabilities request sent by the client to the WMS server, which mainly includes steps S11 to S13.
Step S11, the proxy server receives the GetCapabilities request sent by the client.
For example, a user may send a GetCapabilities REQUEST in the form of http:// localhost: 8080/querycabilities.
And step S12, the proxy server modifies the first UR L address field of the proxy server carried by the GetCapabilities request into the UR L address field of the WMS server.
Specifically, the first UR L address field carried by the GetCapabilites request comprises a first IP address of the proxy server and a first port number of the proxy server, the UR L address field of the WMS server comprises an IP address of the WMS server and a port number of the WMS server, and in specific implementation, the proxy server modifies the first IP address of the proxy server contained by the GetCapabilites request into the IP address of the WMS server and modifies the first port number of the proxy server into the port number of the WMS server.
And step S13, the proxy server sends the modified GetCapabilities request to the WMS server.
Specifically, the proxy server may communicate with the WMS server via the second IP address and the second port number, and further send the modified GetCapabilities request to the WMS server.
Through steps S11 to S13, the GetCapabilities request sent from the client to the proxy server may be forwarded to the WMS server. Then, the WMS server receives and processes the GetCapabilities request, and sends the processing result (i.e., the metadata description document) to the proxy server.
And step S2, the proxy server modifies the UR L address field of the WMS server side contained in the metadata description document into the first UR L address field of the proxy server, and sends the modified metadata description document to the client side.
Specifically, the proxy server can read and modify the metadata description document by the steps of S21, loading the metadata description document into an XM L object, S22, acquiring xlink in the XM L object, wherein the number of the xlink and the href node is greater than 0, S23, if the number of the xlink and the href node is greater than 0, the step S24 is performed, otherwise, the step S27 is performed, the step S24, the IP and the port number of the xlink and the href node, namely the IP address and the port number of the WMS server side, the step S25, the first IP address and the first port number of the proxy server are read from the configuration file, the step S26, the IP address and the port number of the WMS server are replaced by the first IP address and the first port number of the proxy server, and the step S27, the modified metadata description document is obtained, the modified metadata description document is sent to the client side after the metadata description document is read and modified.
And step S3, the proxy server forwards the GetMap request sent by the client to the WMS server, and acquires the map from the WMS server.
Fig. 3 shows a preferred embodiment of proxy server forwarding a GetMap request. As can be seen from fig. 3, the proxy server forwards the GetCapabilities request sent by the client to the WMS server, which mainly includes steps S31 to S33.
Step S31, the proxy server receives the GetMap request sent by the client.
For example, the client may form a GetMap REQUEST in the form of http// localhost: 8080/deiegeewms.
S32, the proxy server modifies the first UR L address field of the proxy server carried by the GetMap request into a UR L address field of the WMS server.
Specifically, the first UR L address field carried by the GetMap request comprises a first IP address of the proxy server and a first port number of the proxy server, the UR L address field of the WMS server comprises an IP address of the WMS server and a port number of the WMS server, and during specific implementation, the proxy server modifies the first IP address of the proxy server contained in the GetMap request into the IP address of the WMS server and modifies the first port number of the proxy server into the port number of the WMS server.
And S33, the proxy server sends the modified GetMap request to the WMS server.
Specifically, the proxy server may communicate with the WMS server via the second IP address and the second port number, and further send the modified GetMap request to the WMS server.
Through steps S31 to S33, the GetMap request sent from the client to the proxy server may be forwarded to the WMS server. And then, the WMS server receives and processes the GetMap request, sends a processing result, namely the map, to the proxy server, and then sends the map to the client through the proxy server.
In the embodiment of the invention, the Web map service can be proxied from the network A to the network B through the steps, so that the requirement of accessing the Web map service across networks is met, and the blank of the prior art is filled. Furthermore, the method for cross-network proxy Web map service is simple and easy to implement and has high practicability.
In addition, the embodiment of the invention also provides a system for cross-network proxy Web map service. FIG. 4 illustrates a block diagram of a system for a cross-Web proxy Web map service in an embodiment of the invention. As can be seen from fig. 3, the system comprises: client 1, proxy server 2, and WMS server 3. The client 1 is located in a network A, and the WMS server 3 is located in a network B.
The client 1 may be a common browser, or may be an application system or component. The client 1 is used for sending a GetCapabilities request to the proxy server 2; the server is also used for receiving the modified metadata description document sent by the proxy server 2, calculating a GetMap request to be sent according to the modified metadata description document, and sending the GetMap request to the proxy server 2; and the map sending module is also used for receiving the map sent by the proxy server.
The system comprises a proxy server 2, a WMS server end 3, a WMS client end 1, a UR L address field of the WMS server end, a UR L address field of the proxy server, a GetCapabilites request and a WMS map, wherein the UR L address field of the WMS server end is changed into the first UR L address field of the proxy server, the metadata description document is sent to the client end 1, the GetMap request is sent to the WMS server end, a map sent by the WMS server end 3 is sent to the client end 1, the first UR L address field comprises a first IP of the proxy server and a first port number of the proxy server, the UR L address field of the WMS server end comprises the IP of the WMS server end and the port number of the WMS server end, when the port number is 80, the port number can be omitted, the proxy server 2 is further used for monitoring connection requests sent by the client end 1, and the connection requests comprise the GetCapabilites request and the GetMap request.
In the concrete implementation, the proxy server 2 can forward the GetCapabilites request through a preferred mode that the proxy server 2 receives the GetCapabilites request sent by the client 1, modifies the first UR L address field of the proxy server carried by the GetCapabilites request into the UR L address field of the WMS server, and sends the modified GetCapabilites request to the WMS server 3, in addition, the proxy server 2 can forward the GetMap request through a preferred mode that the proxy server 2 receives the GetMap request sent by the client 1, modifies the first UR L address field of the proxy server carried by the GetMap request into the UR L address field of the WMS server, and sends the modified GetMap request to the WMS server 3.
And the WMS server 3 is used for sending the metadata description document to the proxy server 2 after receiving the GetCapabilities request and is also used for sending the map to the proxy server 2 after receiving the GetMap request.
In the embodiment of the invention, the Web map service can be proxied from the A network to the B network through the client 1, the proxy server 2 and the WMS map server 3, thereby meeting the requirement of accessing the Web map service across networks and filling the blank of the prior art.
The present inventors have found that none of the existing proxy server tools such as Apache and Wingate can implement the cross-Web proxy WMS map service because these proxy server tools can only convert the IP and port number in the UR L address, and do not have the function of parsing the metadata description document.
In view of this, the embodiment of the present invention further provides a proxy server for implementing a Web map service across networks. Fig. 5 shows an internal component block diagram of the proxy server in an embodiment of the present invention. As can be seen from fig. 5, the proxy server mainly includes: 201. a first transceiver module; 202. a connection request parsing module; 203. a second transceiver module; 204. a metadata parsing module; 205. and a monitoring module.
In this embodiment, the listening module 205 is configured to listen for a connection request sent by a client. The connection request includes: GetCapabilities request, GetMap request.
A first transceiving module 201, configured to receive a GetCapabilities request sent by a client; the system is also used for sending the modified metadata description document to the client; and the map server is also used for receiving a GetMap request sent by the client and sending the map received from the WMS server to the client.
And the connection request analysis module 202 is configured to modify the first UR L address field of the proxy server carried in the GetCapabilities request and the GetMap request into a UR L address field of the WMS server.
The second transceiving module 203 is configured to send the modified GetCapabilities request to the WMS server, and receive a metadata description document sent by the WMS server; and the terminal is also used for sending the modified GetMap request to the WMS server and receiving the map sent by the WMS server.
And the metadata parsing module 204 is used for modifying the UR L address field of the WMS server side contained in the received metadata description document into a first UR L address field of the proxy server, wherein the first UR L address field comprises a first IP address of the proxy server and a first port number of the proxy server, and the UR L address field of the WMS server side comprises an IP address of the WMS server side and a port number of the WMS server side.
In the embodiment of the invention, the proxy server composed of the first and second transceiver modules, the connection request analysis module, the metadata analysis module and the like overcomes the defect that the existing proxy server cannot meet the requirement of cross-network proxy Web map service, and has high practicability.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the specific embodiments described and illustrated in detail herein, and that various changes may be made therein by those skilled in the art without departing from the scope of the invention as defined by the appended claims.

Claims (10)

1. A method for cross-Web proxy Web map services, the method comprising:
s1, the proxy server forwards the GetCapabilities request sent by the client to the WMS server, and receives the metadata description document from the WMS server;
s2, the proxy server modifies the UR L address field of the WMS server side contained in the metadata description document into a first UR L address field of the proxy server, and sends the modified metadata description document to the client side;
s3, the proxy server forwards the GetMap request sent by the client to the WMS server, and acquires a map from the WMS server;
and the GetMap request is calculated by the client according to the modified metadata description document.
2. The method of claim 1, wherein the first UR L address field comprises a first IP of the proxy server, a first port number of the proxy server, and wherein the UR L address field of the WMS server comprises an IP of the WMS server, a port number of the WMS server.
3. The method of claim 1, wherein in step S1, the proxy server forwards the GetCapabilities request sent by the client to the WMS server, including:
s11, the proxy server receives a GetCapabilities request sent by the client;
s12, the proxy server modifies the first UR L address field of the proxy server carried by the GetCapabilities request into a UR L address field of the WMS server;
and S13, the proxy server sends the modified GetCapabilities request to the WMS server.
4. The method of claim 1, wherein in step S3, the proxy server forwards the GetMap request to a WMS server, comprising:
s31, the proxy server receives a GetMap request sent by the client;
s32, the proxy server modifies the first UR L address field of the proxy server carried by the GetMap request into a UR L address field of the WMS server end;
and S33, the proxy server sends the modified GetMap request to the WMS server.
5. The method of any one of claims 1-4, wherein the method further comprises the steps of:
the proxy server monitors the connection request sent by the client; the connection request includes: GetCapabilities request, GetMap request.
6. A system for cross-Web proxy Web map services, the system comprising:
the client is used for sending a GetCapabilities request to the proxy server, calculating a GetMap request to be sent according to the received modified metadata description document, and sending the GetMap request to the proxy server;
the proxy server is used for forwarding the GetCapabilities request to the WMS server, receiving the metadata description document from the WMS server, modifying the UR L address field of the WMS server contained in the metadata description document into a first UR L address field of the proxy server, sending the modified metadata description document to the client, and forwarding the GetMap request to the WMS server;
and the WMS server side is used for sending the metadata description document to the proxy server after receiving the GetCapabilities request and is also used for sending the map to the proxy server after receiving the GetMap request.
7. The system of claim 6, wherein the first UR L address field comprises a first IP of the proxy server, a first port number of the proxy server, and the UR L address field of the WMS server comprises an IP of the WMS server, a port number of the WMS server.
8. The system of claim 6, wherein the proxy server forwards the GetCaabilities request to the WMS server, and specifically, the proxy server receives the GetCaabilities request sent by the client, modifies a first UR L address field of the proxy server carried by the GetCaabilities request into a UR L address field of the WMS server, and sends the modified GetCaabilities request to the WMS server;
the proxy server forwards the GetMap request to a WMS server side, and specifically comprises the steps that the proxy server receives the GetMap request sent by a client side, modifies a first UR L address field of the proxy server carried by the GetMap request into a UR L address field of the WMS server side, and sends the modified GetMap request to the WMS server side.
9. The system of any of claims 6-8, wherein the proxy server is further configured to listen for connection requests sent by the client; the connection request includes: GetCapabilities request, GetMap request.
10. A proxy server, characterized in that the proxy server comprises:
the monitoring module is used for monitoring the connection request sent by the client; the connection request includes: GetCapabilities request and GetMap request;
the first transceiving module is used for receiving a GetCapabilities request sent by a client and sending the modified metadata description document to the client; the system is also used for receiving a GetMap request sent by the client and sending the map received from the WMS server to the client;
the connection request analysis module is used for modifying the first UR L address field of the proxy server carried by the GetCapabilities request and the GetMap request into a UR L address field of the WMS server side;
the second transceiving module is used for sending the modified GetCapabilities request to the WMS server and receiving the metadata description document sent by the WMS server; the terminal is also used for sending the modified GetMap request to the WMS server and receiving the map sent by the WMS server;
and the metadata analysis module is used for modifying the UR L address field of the WMS server side contained in the received metadata description document into the first UR L address field of the proxy server.
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