基于J2EE的高校教学管理系统的性能优化设计_王焜.pdf

9ØÐC}Änull 2008M»11ùJISUANJI YU XIANDAIHUA9»159ùÓcI|: 1006null2475(2008)11null0134null03là°ù: 2008null09null25Á[":SE8639Ã'ù["(2006AA01Z129);SE×Ä$ùî?Z9Ã(9739Ã)T€eº:¦;h(1984null),3,žyû¥¦,0ÊvА SÐÐ/ŒÐý«Vùî3,ùîZ_:jÔÐm^) Ø; Ùg¿,q,pV3=,ùîZ_:jÔÐm^) Øb¿J2EE¥ÚnÐ5 Ø"d¥Ÿ?ªÄ!9¦;h, Ùg¿(厦门大学信息科学与技术学院,,福建厦门 361005)K1:随着 J2EE开发平台的普及和发展,基于 J2EE的教学管理信息系统在高校中的应用也日趋广泛b但是,这一应用也面临着在高负载和高并发条件下的性能问题的困扰b本文以基于 J2EE的高校教学管理系统的开发实践为背景,提出了系统性能上的优化设计方法,如使用服务器集群a负载均衡和数据缓存等技术,在实际的应用中有效地提高了系统性能,使系统达到了高负载和高并发的需求,最后提供了这些设计应用效果的测试数据b1oM: J2EE; 集群;负载均衡; 性能优化Ïms Ë|:TP39null null nullÓDSM’: APerformanceOptim ization Design ofEducationManagementSystem Based on J2EEWANGKun, LICuinullhua(College ofComputerScience andTechnology, XiamenUniversity, Xiamen 361005, China)Abstract: With the popularization anddevelopmentofJ2EEplatform, moreandmoreuniversitiesapply thistechnology to developtheirEducationManagementSystem. Meanwhile, italsomeets some performance problems in the situation ofhigh load and highconcurrent. On thebasisofthe developmentpracticeofa J2EEnullbasedEducationManagementSystem, discusses a seriesofpernullformance optimization designs, such asusing cluster, loadbalancing anddata cache technologies. A realistic example showsthatthese designs improve theperformance effectively and thesystemmeetsthedemandofhigh load andhighconcurrent. Then showsthe applied effectof thesedesignswith testing data.Keywords: J2EE; cluster; loadbalancing; performance optimization0null„nullýy!ڣܥvÐ,Ð5 ؐ"dy!^dÈ×1¥BñÌ«b7J2EE( Java2 Platform, EnnullterpriseEdition)^"-¤ž{ Ÿ¥"dŸ?†®,µA1ç5y ëB甥”  o õ¤ibÏiÏî”  o õ¤ý,’³1`ٔ  oH,°¤V õ¤ýÏ| õ¤,P¨›ªÜ õ¤BΞ õ¤ý,7‚^1>bƒ"ü‚AÄQ`ٔ  oHû׍y ë õ¤,yNv¹«8'÷„HW[ 3]b”`Ùª,"dʨHibernateT¹ûòÄZÃ,y¹Hibernate^çna 7÷¥,µ~¶¥Ó–„×ç¥ 7?ß,iO4L æ¥ý¥ÂZÃ[4]b'"d¨Hibernate 7?Fª5wi¥»ØZ õ¤ýÁÖC3P0bõ¤ý¥?öv¹•Y‹¨¥Ÿ?bªÄ©kVñÏ,;ÜCíE|”  o õ¤¥Ù5,Œ'"dKvi?¨¼” Ú¥f ƒ,| õ¤ý?ØÚ,V7³ %ƒBÙ5b1. 3. 2P¨ÏiÏi/Œ^h”  o°¤`Ù¥BÕmbÏiÏ¥” ^”  oϔ ¥ J,‹¨ñ½” ¥H© V[°¤|ÏiÏ¥” b®¿ÏiYÈ[=iT¹ºÉ,7”  o^[—T¹ºÉ¥,V=i|” ¥Îù1V—|” 1y,yNÏih°¤”  o¥Q”,V74Ú” ¥Îb† صr¹!9„P¨Ïi^ªÄ‹¨"dŸ?¥×1m,ƒBÄ¿Web¥a¦ûv¨¼¥"dÏ­¹üA[ 1]bHibernateÏ,LCz¥ÏiÅb®¿"dÏ,iÔN¥°Ø T,yNÜÈP¨¥°ØÔ P¨°ØÏi, V[h”  o T,4Ú°ØŸ?bn5,Hibernateϥ»=)Ïi,®¿'"dP¨‹¨›"•,yNÊ4¦û•"Ìâ¥JBossCacheÏi¬qT¹Hibernate¥=)Ïi[5]bJBossCache4ReapplicationT¥Ï,'ÂT"•Ïñ«Ä¥” ?3¿M,N«Äö|?3¿M¥” ¥Kñ'¯Åž"•Ï¥Äñ«ÄÏ[ûÄÿBÁb136null 计null 算null 机null 与null 现null 代null 化 2008年第 11期¥ÂzÏi­ª,ü V["dÏ æ¨Hibernullnate¥Query¤ g¥setCacheable()ZE ŸLC°ØÏib[Ï¥Bñ°Ø¹ è,Â1°Ø3¹null¦ônull¥Ð3,ñ½Â/:String name = null¦ônull;Query query = session. createQuery ( null from student swhere s.name=: namenull );query. setString(null namenull, name);query. setCacheable( true);ƒ"üLC 樰ØÏi¥Å ŸªÄ°ØŸ?b1. 3. 3¨°ØÔ Ïþç•”¥ZTHibernate¥•”þçÅ? æ¨"dP¨¥Oracle”  oî4¥çIrSQLÔ ¥ÿ?,4Ú°ؔ ¥Ÿ?bçIr'º³IrSQLÔ BQ,ÜIr Ÿ¥ V³›}’iÏiÏ,ÂTQ³›M]™T¥SQLÔ ,‚³1׍Ir,º1VÏiϤ³›}’' V[5]b["dÏ¥Bñ°Ø¹ è,°ØM)¹2002)¥Ð3,ñ½Â/:Query query = session. createQuery ( null from student swhere s.grade=: gradenull );query. setString(null gradenull, null 2002null );ÓD[6]Ï4žJDBC³›°ØH³1`ٔ o¥Q”¥9ØT^:`ٔ  oQ”=²T"Ï¥”nullÔ ³›¥Q”null 2byN,¨çIrÔ ÿ? V[vvhÔ ³›¥Q”,V7h`ٔ  oQ”b1. 3. 4 SQLÔ ØªÏBñSQLÔ 1³›“ÉBHW,œñ'÷9|B°]¨,ö†®ñ½¥³›rq,yN‹ÐP¨ªÄV¥SQLÔ b"dÏ,ô [/Bt?5SQLÔ É›Øª:(1) s æ¨ì„,EçM10°Øb3*ªQ,rq®bÂTA¶P¨,‹¾0°ØÏVrÕÐ V?¥›b(2)† ØP¨EXISTS0 bEçwhere0 ÏP¨isnullisnotnullb(3) s æ¨ õ¤Hqbtf ƒ/,ñV­Wµ‚¸Bñ¥ õ¤Hq,ƒ^where0 Ï|õ¤Hq›œ¹, V[vv4Ú°ØÎb(4)ÂTHq¸, V[a’9FºÅ3bٖƒÕZT´»ØST,Œñ’L^4Ú°ØŸ?Kµr¥m­Bba’¥ÊÂ9FºÅ3,V[h õ¤°Ø,4Ú°Ørqb2nullªÄrTsP¨LoadrunnerT¹Ÿ?©ký "dªÄ-ªÉ›©kbÊ4Ð3¨cÐ5 Ø"di°Ø [ñT¹EÆß,iEñ´E¨¼i?`Ùbª。