Web信息系统毕业论文中英文资料外文翻译文献.docx
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Web信息系统毕业论文中英文资料外文翻译文献.docx
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Web信息系统毕业论文中英文资料外文翻译文献
Web信息系统毕业论文中英文资料外文翻译文献
中英文资料翻译
With thepopularity of theInter NET applications, avarietyofWeb InformationSystem
Hasbecome a pressing issue. Establish the essence of Web informationsystems
Developmentofa Web repository (database asthecoreof avarietyof Web letter
Informationstorage) asthecore Web applications. Currently,theWeb repositorydevelopment technology
Operation of awiderangeof differentcharacteristics. Variousperiods atalllevels, avarietyofpurposes
Technology co-exist, dizzying mirror chaos,itisdifficultto choose. More popular
Java of
And Jav a program of classes andpackages.
1Servlet access model
2Serv thelet,therearethree accessmodels:
(1) anaccess model
1 browserto Webserver to issue a retrieval request.
2 theWeb server after receiptoftherequest, the request forwardedtothe Servletengine.
3Serlet engine toperformtherequested the Servlet and directly throughJDBC
4Servlet throughJDBC toretrieve searchresults to generate the html pageand
Page backto the Webserver.
5 theWeb server thepage is sent backtothebrowser.
(2)Thesecond access model
1 browserto Webserver to issue a retrieval request.
2 theWeb serverreceivestherequest afterthe request forwardedto the ofSer v theletengine.
3Servlet engine toperformthe request the the Servlet and retrieve sent
Ja, vabean access to the data.
4data access the Javabean searchabledatabase throughJDBC information
And fromthesearchresults stored in itself.
5Servlet remove searchresults from the data access Javabean generate
Html pageand Ht mlof page backtothe w eb server.
6 theWeb server thepage is sent backtothebrowser.
(3) Thethird accessmodel
1A browser issue a retrieval request totheWebserver.
2 Web serverreceivestherequest afterthe request forwardedto the ofSer v thelet engine.
OfSer vlet engine toperformtherequested Servlet directly throughJDBC inspection
3The cable databaseand searchresults arestoredinthe resultisstored the Javabean into.Javabean,
4. Ser v thelet from the resultsarestored to remove the searchresults and
JSPfiles to format the output page.
2 Servlet functionalityand lifecycle
2.1Servlet functions
(1) Create andreturn dynamicWebpages based on customerrequests.
(2) create canbeembeddedinto existing HTMLpages aspartof HTML
Page(HT fragment) of theML.
(3) and other serverresources (includingdatabases and applications based on the Jav a
Program) tocommunicate.
(4) to handle multiple client connections,receiving the input of more than one client,and
Theresults broadcastto multipleclients. For example,Ser vlet isamulti-participant
Gameserver.
(5) ofMIM E type filter information on the specialhandling,suchas image
Conversionand server-side include (SSI).
(6) custom processing available to allserversin thestandard routine.
2.2Servletlifecycle
Servlet lifecycle begins with itinto the Webserver'smemory
And end in the terminationor re-loaded Serv thelet.
(1)load.
Load the servlet atthefollowing times:
1.Ifyouhaveconfigured automatic load option,and then start the Webserver automaticallyloaded
2.After the start of the Webserver, the client Serv thelet issued for the first time,please
Demand.
3.Reload Serv thelet.
Loaded Servlet,Webservers tocreatea servletinstance, and
Servlet's init()method is called. Servlet initialization parameters in the initializationphase,
The number ispassed totheServlet configurationobject.
(2)terminate
When the Webserver nolonger needs the servlet, or reload Servlet
Anewinstanceof the server calls Serv thelet's destroy()method, removeitfromthe
Memory deleted.
3Howto call Servlet
Method ofSer vlet is called Total fivekinds:
call intheURL in the form
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