知识大全 JavaWeb应用中获取Spring的ApplicationContext

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　　ApplicationContext是Spring的容器环境 通过ApplicationContext对象可以访问所有配置的bean

　　在Web开发开发中 常常需要从JSP或者Servlet或者Action中获取ApplicationContext对象 这时候 就无法使用new关键字通过查找配置文件来实例化ApplicationContext这个对象了 Spring通过WebApplicationContextUtils可以方便实现您的需求 下面看个例子

　　一 Spring +Struts 环境下

　　 配置web xml 通过这个配置来获取的

　　 <?xml version= encoding= UTF ?> <web app xmlns=                      xmlns:xsi= instance                      xsi:schemaLocation=          app_ _ xsd                      version= >         <context param>                 <param name>contextConfigLocation</param name>                 <param value>/WEB INF/applicationContext xml</param value>         </context param>         <filter>                 <filter name>struts </filter name>                 <filter class> apache struts dispatcher FilterDispatcher</filter class>         </filter>         <filter mapping>                 <filter name>struts </filter name>                 <url pattern>/*</url pattern>         </filter mapping>         <listener>                 <listener class> sprntext ContextLoaderListener</listener class>         </listener>         <servlet>                 <servlet name>dispatcher</servlet name>                 <servlet class> springframework web servlet DispatcherServlet</servlet class>                 <load on startup> </load on startup>         </servlet>         <servlet mapping>                 <servlet name>dispatcher</servlet name>                 <url pattern>* form</url pattern>         </servlet mapping> </web app>

　　 在JSP Servlet Action中获取ApplicationContext

　　 <%@ page import= lavasoft service TestService %> <%@ page import= ntext ApplicationContext %> <%@ page import= sprntext support WebApplicationContextUtils %> <%@ page contentType= text/;charset=UTF language= java %> <> <head><title>Simple jsp page</title></head> <body> <% //        ApplicationContext ctx = WebApplicationContextUtils getWebApplicationContext(request getSession() getServletContext());         ApplicationContext ctx = WebApplicationContextUtils getWebApplicationContext(session getServletContext());         TestService service = (TestService) ctx getBean( testService );         String s = service test();         out print(s); %> </body> </>

　　二 Spring+JSP的环境

　　在此环境下web xml配置会有些变化

　　 <?xml version= encoding= UTF ?> <web app xmlns=                      xmlns:xsi= instance                      xsi:schemaLocation=          app_ _ xsd                      version= >         <context param>                 <param name>contextConfigLocation</param name>                 <param value>/WEB INF/applicationContext xml</param value>         </context param>         <listener>                 <listener class> sprntext ContextLoaderListener</listener class>         </listener>         <servlet>                 <servlet name>dispatcher</servlet name>                 <servlet class> springframework web servlet DispatcherServlet</servlet class>                 <load on startup> </load on startup>         </servlet>         <servlet mapping>                 <servlet name>dispatcher</servlet name>                 <url pattern>* form</url pattern>         </servlet mapping> </web app>

　　获取的方式和上述完全一样

　　下面给出本例子的工程源码 参看附件

　　下载附件

　　testspringweb

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