CN102446185A - Web geographic information system (GIS) based on java 2 platform enterprises edition (J2EE) and enterprises java bean (EJB) - Google Patents
Web geographic information system (GIS) based on java 2 platform enterprises edition (J2EE) and enterprises java bean (EJB) Download PDFInfo
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- CN102446185A CN102446185A CN2010105045778A CN201010504577A CN102446185A CN 102446185 A CN102446185 A CN 102446185A CN 2010105045778 A CN2010105045778 A CN 2010105045778A CN 201010504577 A CN201010504577 A CN 201010504577A CN 102446185 A CN102446185 A CN 102446185A
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Abstract
The invention relates to a web geographic information system (GIS) based on a java 2 platform enterprises edition (J2EE) and an enterprises java bean (EJB), which comprises a client terminal, a Web server, an application server, GIS server, a data server and an EJB server. The client terminal is connected with the Web server through the Internet, the Web server is arranged on the application server which is connected with the GIS server, and the GIS server is respectively connected with the data server and the EJB server. The GIS server classifies map data into background data and thematic data, and sends the classified background data and the thematic data to the Web server. The Web server transmits the thematic data to the client terminal in vector mode, and enables the background data to be generated into images, and then the images are downloaded in the client terminal. Compared with the prior art, the web GIS based on the J2EE and the EJB has the advantaged of being capable of guaranteeing that the client terminal can process vector data, controlling data transmission quantity to the minimum and the like.
Description
Technical field
The present invention relates to a kind of WebGIS system, especially relate to a kind of WebGIS system based on J2EE/EJB.
Background technology
The system structure of GIS has experienced following four-stage: single cpu mode, hubbed mode, client/server (C/s) pattern and browser/server (B/s) pattern.Traditional GIS mainly adopts the first three pattern, and wherein C/S model is the highest form of its development.C/S model has made full use of the resource of client computer, and all calculating are all carried out in client computer, and client-server is kept stable connection, and server centered is used for access data.This is obvious for distributed enterprise-level GIS application limit: a large amount of public users can't be kept stable being connected with server, also do not have enough bandwidth to come successfully to duplicate and transmit data; In addition, it also need be at the special GIS software of client independent installation.
Current WebGIS based on Internet mainly adopts browser/server (B/S) pattern.Different according to browser end and server end information transmitted (and packing manner of information) can further be subdivided into thin-client, medium client and three kinds of patterns of Fat Client with WebGIS.Data stream with WebGIS in the OpenGIS standard is summarised as four-stage, this four-stage and three kinds of client modes right
Under the thin-client pattern, server end is an image to the browser end transmission, like GIF; JPEG; PNG, browser end only accomplish integration of user interaction functionality, and all are placed on server end to user's request responding and carry out under medium client mode; Server end is at first learned processing according to client-requested with carrying out; Extract feature set, convert feature set to vector graphics (learning attribute information) then with having, like simple vector graphics (SVG) form of W3C (worldwide we consor-tium) and the formulation of numerous manufacturer, VRML form, SWF form etc.Server end is the vector graphics of uniform format to browser end transmission, like this in client except handing over request, can also handle as amplifying, dwindle, roam the figures function, alleviated load of server.Under the Fat Client pattern, server only carries out data filter, then result set is fed back to client, and the family end can carry out GIS and analyze.OpenGIS advocates result set and adopts GML (geographicmarkup language) form in transmission over networks.
Raster mode the processing capacity of client too a little less than, frequent with server interaction, but data quantity transmitted is less relatively; Arrow pattern is stronger at client functionality, and is few with the server interaction number of times, but a data quantity transmitted is bigger.
Summary of the invention
The object of the invention is exactly to provide a kind of arrow pattern and raster mode to mix the WebGIS system based on J2EE/EJB that uses for the defective that overcomes above-mentioned prior art existence.
The object of the invention can be realized through following technical scheme:
A kind of WebGIS system based on J2EE/EJB; Comprise client, Web server, application server, it is characterized in that, also comprise GIS server, data server, EJB server; Described client is connected with Web server through Internet; Described Web server is located on the application server, and described application server is connected with the GIS server, and described GIS server is connected with data server, EJB server respectively; Described GIS server is categorized into background data and thematic data to map datum; Described GIS sends to Web server with sorted background data and thematic data, and described Web server is transferred to client with thematic data through approach vector, and described Web server downloads in the client after background data is generated image earlier again.
Be provided with EJB Container (Enterprise Java Bean container) in the described GIS server, be provided with EJB Component (EJB assembly) among this EJB Container.
Described data server is provided with file server interface, relational database server interface, other database server connectors.
Described client is provided with browser, GIS processor.
Compared with prior art, the present invention has geodata is divided into two types: background data and thematic data, be used for participating in figure layer that GIS analyzes computing as thematic data, and adopt the approach vector transmission; Other lot of background data generate image at server earlier, download to client again, have so both guaranteed the ability of client process vector data, will count transmission quantity again and control to minimum.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation of the embodiment of the invention 2.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
In order to contend with Microsoft, Sun Microsystems has issued the EJB standard, and receives the support of large quantities of companies such as IBM, Oracle, BEA and tissue.Follow the EJB standard and make the Application developer needn't understand the affairs of low level and details, multithreading, resource sharing and other complicated rudimentary API of condition managing, thereby be absorbed in the exploitation of service logic, easily make up distributed application program.Fall the model of B owing to adopted pure Java technology based on J2EE, thus it than COM+ model more attractive a bit be its professional platform independence, promptly " once write, everywhere operation ".But should see that also because Java adopts virtual machine mechanism, when realizing same GIS function, the efficient of JavaBean is less than the COM+ object.
Implementation framework based on the WebGIS of J2EE/EJB is as shown in Figure 1; Comprise client 1, Web server 2, application server 3, GIS server 4, data server 6, EJB server 5; Described client 1 is connected with Web server 2 through Internet; Described Web server 2 is located on the application server 3; Described application server 3 is connected with GIS server 4, and described GIS server 4 is connected with data server 6, EJB server 5 respectively, and described GIS server 4 is categorized into background data and thematic data to map datum; Described GIS sends to Web server 2 with sorted background data and thematic data; The figure layer that is used for participating in GIS analysis computing is as thematic data, and described Web server 2 is transferred to client 1 with thematic data through approach vector, and described Web server 2 downloads in the client 1 after background data is generated image earlier again.Be provided with EJB Container in the described GIS server 4, be provided with EJBComponent among this EJB Container.Described data server 6 is provided with file server interface, relational database server interface, other database server connectors; Described file server interface is connected with file server 7; Described relational database server interface is connected with relational database server 8; Described other database server connectors are connected with other database servers 9, and described client 1 is provided with browser, GIS processor.
As shown in Figure 2, be the logic diagram of functions such as the map issue that realizes certain website, information inquiry, Shortest Path Analysis, buffer zone analysis, thematic map making.
Function and performance test have been carried out in the website; Particularly the concurrent user visits test; Be requisite link before the issue of enterprise-level WebGIS system. use business software WebPer-formance2.0 that performance test has been carried out in the website; The result shows that owing to adopted technology such as object pool, instant activation, metadata cache, system supports 400 user concurrent access and 4000 users to continue 10min with every 1s speed once and clicks amplifieroperation.
Claims (4)
1. WebGIS system based on J2EE/EJB; Comprise client, Web server, application server, it is characterized in that, also comprise GIS server, data server, EJB server; Described client is connected with Web server through Internet; Described Web server is located on the application server, and described application server is connected with the GIS server, and described GIS server is connected with data server, EJB server respectively; Described GIS server is categorized into background data and thematic data to map datum; Described GIS sends to Web server with sorted background data and thematic data, and described Web server is transferred to client with thematic data through approach vector, and described Web server downloads in the client after background data is generated image earlier again.
2. a kind of WebGIS system based on J2EE/EJB according to claim 1 is characterized in that, is provided with EJB Container in the described GIS server, is provided with EJB Component among this EJB Container.
3. a kind of WebGIS system based on J2EE/EJB according to claim 1 is characterized in that described data server is provided with file server interface, relational database server interface, other database server connectors.
4. a kind of WebGIS system based on J2EE/EJB according to claim 1 is characterized in that described client is provided with browser, GIS processor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105045778A CN102446185A (en) | 2010-10-12 | 2010-10-12 | Web geographic information system (GIS) based on java 2 platform enterprises edition (J2EE) and enterprises java bean (EJB) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105045778A CN102446185A (en) | 2010-10-12 | 2010-10-12 | Web geographic information system (GIS) based on java 2 platform enterprises edition (J2EE) and enterprises java bean (EJB) |
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| CN102446185A true CN102446185A (en) | 2012-05-09 |
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Cited By (2)
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| CN103279526A (en) * | 2013-05-30 | 2013-09-04 | 中国科学院国家天文台 | WebGIS three-dimensional lunar system based on ActiveX and realizing method of WebGIS three-dimensional lunar system |
| CN105447039A (en) * | 2014-08-29 | 2016-03-30 | 重庆市上卓信息技术有限公司 | Geological information system adapter |
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| US6604046B1 (en) * | 1999-10-20 | 2003-08-05 | Objectfx Corporation | High-performance server architecture, methods, and software for spatial data |
| CN1971560A (en) * | 2006-09-28 | 2007-05-30 | 江苏天泽信息产业有限公司 | Method of generating and organizing source data of grid electron map and method of generating target data |
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| CN103279526A (en) * | 2013-05-30 | 2013-09-04 | 中国科学院国家天文台 | WebGIS three-dimensional lunar system based on ActiveX and realizing method of WebGIS three-dimensional lunar system |
| CN103279526B (en) * | 2013-05-30 | 2016-08-24 | 中国科学院国家天文台 | A kind of WebGIS three-dimensional moon system based on ActiveX and implementation method |
| CN105447039A (en) * | 2014-08-29 | 2016-03-30 | 重庆市上卓信息技术有限公司 | Geological information system adapter |
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Application publication date: 20120509 |