框架提供了構建Web應用程序的全功能MVC模塊使

SpringMVC背景介Spring框架提供了構建Web應用程序的全功能MVC模塊。使用Spring可插入的MVCSpringWebStrutsWeb框架。通Spring（JSP）技術、Velocity、Tiles、iTextPOI。SpringMVC框架并不知道使用的視圖，所JSP技術。SpringMVC分離了控制器、模型對象、分派器以及處理開發(fā)效率上,基本正好相反。值得強調(diào)的是，springmvcstruts2Spring3MVC1、Spring3MVCStruts2，Struts2用不上的多余功2、Spring3MVC很容易就可以寫出性能優(yōu)秀的程序，Struts2要處處才可以寫出性能優(yōu)秀的程序（MVC部分）環(huán)境搭建第一步：導入spring/libs/jar包第二步：配置請求分發(fā)器DispatcherServlet>>第三步：在classpath下建立一個spring- 配置文<?xml<?xmlversion="1.0"encoding="UTF-<beans""""<ponent-scanbase-第四步：導入日志環(huán)境 ,并添加perties配置文##LicensedtotheApacheSoftwareFoundation(ASF)underoneor#contributorlicenseagreements.SeetheNOTICEfiledistributed#thisworkforadditionalinformationregardingcopyright#TheASFlicensesthisfiletoYouundertheApacheLicense,Version#(the"License");youmaynotusethisfileexceptincompliance#theLicense.YoumayobtainacopyoftheLicense##Unlessrequiredbyapplicablelaworagreedtoinwriting,software#distributedundertheLicenseisdistributedonan"ASIS"BASIS,#WITHOUTWARRANTIESORCONDITIONSOFANYKIND,eitherexpress#SeetheLicenseforthespecificlanguage erningpermissionsand#limitationsundertheLicense.#Anexamplelog4jconfigurationfilethatoutputsto#outputinformationconsistsofrelativetime,loglevel,#name,loggername,nesteddiagnosticcontextandthemessagein##Forthegeneralsyntaxofpropertybasedconfigurationfilessee#documenationoflog4j.rootLogger=DEBUG,#A1issettobeaConsoleAppenderwhichoutputstoSystem.out.#A1usesPatternLayout.##Theconversionpatternusesformatspecifiers.Youmightwant#changethepatternanwatchtheoutputformatchange.log4j.appender.A1.layout.ConversionPattern=%-4r%-5p[%t]%37c%3x-#Inthisexample,wearenotreallyinterestedinINNERloopor#messages.Seetheeffectsmentingandchangingthe#thefollowing#.apache.log4j.examples.SortAlgo.INNER=WARN#.apache.log4j.examples.SortAlgo.SWAP=WARN第五步：編寫一個 發(fā)送請求項目名 publicclassDemoController public return}}SpringMVC3.0深DispatchServlet內(nèi)部，通過HandleMap檢查這個url有沒有對應的Controller。如果Controller。ControllerController執(zhí)行完畢后，如果返回字符串，則ViewResolver將字符串轉(zhuǎn)化成相應的視圖ModelAndView對象，該對象本身就包含了視圖對象信息。討論HandlerMap起到了什么作用？？ 如果你學過struts2是否記得有一ActionMap呢spring3.0jarspringaopspringasm字節(jié)碼生IOCIOCspring的springwebmvc<filter-name>CharacterEncodingFilter</filter-<init-<param-name>encoding</param-<param-value>utf-8</param-</init-<filter-><filter-name>CharacterEncodingFilter</filter-<url-pattern>/*</url-</filter->@ControllerStruts1一樣，SpringControllerSingleton的。這就意味著會被多個請求線程共spring3.0中，通過@controllerclasscontroller ponent-scanbase-packagepackageimportimportimport;importpublicclassUserControllerprivateUserServicepublicStringreg(Stringuname) return}publicUserServicegetUserService()return}publicvoidsetUserService(UserServiceuserService)this.userService=}}publicStringreg5(@RequestParam("name")Stringmap)return}publicStringreg4(ModelMapmap){ map.addAttribute("u","uuuu");//將u放入request作用域中，這樣return}} publicclassUserController這個注解可以跟@SessionAttributesModelMap中屬性的值通packageimportimportimportimportorg.springframework.web.bind.annotation.ModelAttribute;importorg.springframework.web.bind.annotation.RequestMap importorg.springframework.web.bind.annotation.SessionAttributes; publicclassUserController publicStringreg4(ModelMapmap) return} publicStringreg5(@ModelAttribute("u")Stringuname,ModelMapmap){ return}}ControllerController}returnpublicStringreg4(ModelMapmap)packagepackageimportimportimportimportimportimport;publicclassUserControllerpublicStringreg4(ModelMapmap)returnreturn"forward:user.do?method=reg5"return"redirect:user.do?method=reg5";//return";//}publicStringreg5(Stringuname,ModelMapmap)return}}}p:prefix="/WEB-INF/jsp/"<propertyname="viewClass"value="org.springframework.web.servlet.view.JstlView"/>request對象、sessionpublicclassUserControllerpublicStringreg2(Stringuname,HttpServletRequestreq,ModelMapreq.setAttribute("a","aa");req.getSession().setAttribute("b","bb");return}}}map的實現(xiàn)，可以在其中存放屬性，作用域同request。下面這個示例，我們可以在packagepackageimportimportimport;;publicclassUserControllerextendsMultiActionControllerpublicStringreg(Stringuname,ModelMapmap){map.put("a","aaa");return}}<%@<%@pagelanguage="java"import="java.util.*"<%@taglibprefix="c"/jsp/jstl/core"<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01<c:outModelAndViewModelAndViewModel代表模型，View代表視圖。即，這個類把要顯示的數(shù)據(jù)到了Model屬性中，要跳轉(zhuǎn)的視圖信息到了view屬性。我們看一下ModelAndView的部分源碼，即可知其中關系：publicpublicclassModelAndView/**ViewinstanceorviewnameStringprivateObject/**ModelMapprivateModelMap*Indicateswhetherornotthisinstancehasbeenclearedwithacallto{@link#clear()}.privatebooleancleared=Defaultconstructorforbean-styleusage:populatingpropertiesinsteadofpassinginconstructor@see@seepublicModelAndView()}ConvenientconstructorwhenthereisnomodeldatatoCanalsobeusedinconjunction@paramviewNamenameoftheViewtorender,tobebytheDispatcherServlet's@seepublicModelAndView(StringviewName)this.view=}ConvenientconstructorwhenthereisnomodeldatatoCanalsobeusedinconjunction@param@paramviewViewobjectto@seepublicModelAndView(Viewview)this.view=}CreatesnewModelAndViewgivenaviewnameanda@paramviewNamenameoftheViewtorender,tobebytheDispatcherServlet's@parammodelMapofmodelnames(Strings)tomodel(Objects).Modelentriesmaynotbe<code>null</code>,modelMapmaybe<code>null</code>ifthereisnomodelpublicModelAndView(StringviewName,Map<String,?>model)this.view=if(model!=null){}}*CreatesnewModelAndViewgivenaViewobjectanda*<emphasis>Note:dmodeldataiscopiedinto*storageofthisclass.Youshouldnotconsiderto Mapaftersupplyingittothis@paramviewViewobjectto@parammodelMapofmodelnames(Strings)tomodel(Objects).Modelentriesmaynotbe<code>null</code>,modelMapmaybe<code>null</code>ifthereisnomodelpublicModelAndView(Viewview,Map<String,?>model)this.view=if(model!=null){}}Convenientconstructortotakeasinglemodel@paramviewNamenameoftheViewtorender,tobebytheDispatcherServlet's@parammodelNamenameofthesingleentryinthe@parammodelObjectthesinglemodelpublicModelAndView(StringviewName,StringmodelName,ObjectmodelObject){this.view=viewName;addObject(modelName,modelObject);}Convenientconstructortotakeasinglemodel@paramviewViewobjectto@parammodelNamenameofthesingleentryinthe@parammodelObjectthesinglemodelpublicModelAndView(Viewview,StringmodelName,ObjectmodelObject){this.view=view;addObject(modelName,modelObject);}SetaviewnameforthisModelAndView,toberesolvedDispatcherServletviaaViewResolver.Willoverridepre-existingviewnameorpublicvoidsetViewName(StringviewName)this.view=}ReturntheviewnametoberesolvedbytheviaaViewResolver,or<code>null</code>ifweareusingaViewobject.publicpublicStringgetViewName()return(this.viewinstanceofString?this.view:}SetaViewobjectforthisModelAndView.Willoverridepre-existingviewnameorpublicvoidsetView(Viewview)this.view=}ReturntheViewobject,or<code>null</code>ifweareusingaviewnametoberesolvedbytheDispatcherServletviaapublicViewgetView()return(this.viewinstanceofView?(View)this.view}Indicatewhetherornotthis<code>ModelAndView</code>hasaview,eitherasaviewnameorasadirect{@linkView}publicbooleanhasView()return(this.view!=}Returnwhetherweuseaviewreference,iftheviewhasbeenspecifiedviaanametoberesolvedbytheDispatcherServletviaapublicbooleanisReference()return(this.viewinstanceof}Returnthemodelmap.MayreturnCalledbyDispatcherServletforevaluationoftheprotectedMap<String,Object>getModelInternal()return}Returntheunderlying<code>ModelMap</code>instance(never<code>null</code>).publicModelMapgetModelMap()if(this.model==null)thisthis.model=new}return}Returnthemodelmap.NeverreturnsTobecalledbyapplicationcodeformodifyingthepublicMap<String,Object>getModel()return}Addanattributetothe@paramattributeNamenameoftheobjecttoaddtothe@paramattributeValueobjecttoaddtothemodel@seeModelMap#addAttribute(String,@seepublicModelAndViewaddObject(StringattributeName,ObjectattributeValue){return}Addanattributetothemodelusingparametername@paramattributeValuetheobjecttoaddtothemodel(never<code>null</code>)@see@seepublicModelAndViewaddObject(ObjectattributeValue){return}AddallattributescontainedintheprovidedMaptothe@parammodelMapaMapofattributeName->attributeValue@see@seepublicModelAndViewaddAllObjects(Map<String,?>modelMap){return}ClearClearthestateofthisModelAndViewTheobjectwillbeempty<p>CanbeusedtosuppressrenderingofagivenModelAndViewobjectinthe<code>postHandle</code>methodofa@see@seepublicvoidclear(){this.view=null;this.model=null;this.cleared=true;}ReturnwhetherthisModelAndViewobjectisi.e.whetheritdoesnotholdanyviewanddoesnotcontainamodel.publicbooleanisEmpty()return(this.view==null&&}ReturnwhetherthisModelAndViewobjectisemptyasaresultofacallto{@link#clear}i.e.whetheritdoesnotholdanyviewanddoescontaina<p>Returns<code>false</code>ifanyadditionalstatewasaddedtotheinstance<strong>after</strong>thecallto{@link@seepublicbooleanwasCleared()return(this.cleared&&}ReturndiagnosticinformationaboutthismodelandpublicStringtoString()StringBuildersb=newStringBuilder("ModelAndView:if(isReference())sb.append("referencetoviewwithname}elsesb.append("materializedViewis}sb.append(";modelisreturn}}packageimportimport import;import publicclassUserControllerextendsMultiActionController publicModelAndViewreg(StringModelAndViewmv=new mv.setView(newUseru=newUser(); 寫的類名”mv.addObject("a",return}}<%@pagelanguage="java"import="java.util.*"<%@taglibprefix="c" /jsp/jstl/core"<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01spring3.0mvcspring使用 mons下得上傳組件，因此，我們需要引入兩個jar包<beanResolver"<propertyname="defaultEncodingvalue="gbk"(ISO-8859-1)--<propertyname="maxInMemorySizevalue="10240"最大內(nèi)存大小(10240)--><propertyname="uploadTempDirvalue="/upload/"上傳后的名(WebUtils#TEMP_DIR_CONTEXT_ATTRIBUTE)--><propertyname="maxUploadSizevalue="-1"最大文件大小，-1為無限止(-1)--><%@<%@pagelanguage="java"import="java.util.*"<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01<formaction="upload.do"method="post"enctype="multipart/form-<inputtype="text"name="name"<inputtype="file"name="file"<inputtype="submit"packagepackageimportimportimportimportimportorg.springframework.web.bind.annotation.RequestMap importorg.springframework.web.bind.annotation.RequestMethod;importorg.springframework.web.bind.annotation.RequestParam;importimportpublicvoidsetServletContext(ServletContextcontext){ =context;} (value="/upload.do",method=if(!file.isEmpty())Stringpath= StringfileName=StringfileType=fileName.substring(fileName.lastIndexOf("."));Filefile2newFile(path,newDate().getTimefileType新建一個文件try{);//}catch(Exceptione)}returnreturn}}}upload_ok.jsp<%@<%@pagelanguage="java"import="java.util.*"<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01<%@<%@pagelanguage="java"import="java.util.*"<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01發(fā)布項目，運試： ajax請 in;charset=utf-public@ResponseBodyfindById(IntegerUseruser=new//這里可以使用gsonreturn"{id:1,name:'小嘎return}json格式的數(shù)據(jù)<script<scriptvarvarfunctiontest(){}}returnnull; public testAdd(@RequestBodyUser<buttononclick="test();"}自動轉(zhuǎn)換json為響應內(nèi)容checkName(StringSpringSpring<mvc:annotation-driven></mvc:annotation-項目下要加入jacksonjarjackson-all-}return// po--Useruser=newSpring中的定義spring器兩種基本方注意：參數(shù)中的Objecthandler是下一個器 (HttpServletRequestrequest,HttpServletResponseresponse,Objecthandler)throwsExceptiontrueaction。 (HttpServletRequestrequest,HttpServletResponseresponse,Objecthandler,ModelAndViewmodelAndView)throwsExceptionpublicvoid pletion(HttpServletRequestrequest,HttpServletResponseresponse,Objecthandler,Exceptionex)throwsExceptionex是否為空，來進行相spring框架從而到了這個方法中。 packagepackageimportimportimportimportimportpublic