Spring4.04中实现bean的scope(范围)设置为session或者request

Sping中bean的scope的值可以是singleton、prototype、request、session、global session。默认情况下是singleton。

只有在web容器中才能使用request、session、global session。

下面我怎么实现使用session或request的方法，不足之处请指出。

首先在eclipse中建一个web工程，整体架构如下图所示：

Spring的配置文件Spring-config.xml中的内容如下所示，下面的userService1的scope的值为session：

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xmlns:context="http://www.springframework.org/schema/context"     xsi:schemaLocation="http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans.xsd         http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context.xsd">     <context:annotation-config/>         <bean id="userDao1" class="com.yun.project.dao.UserDao" scope="prototype">         </bean>         <bean id="userService1" class="com.yun.project.service.UserService" scope="session">

            <property name="userDao" ref="userDao1"/> 

        </bean> </beans>

新建一个名为UserServlet的Servlet，内容如下所示：

package com.yun.project.servlet; import java.io.IOException; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.context.ApplicationContext; import org.springframework.web.context.WebApplicationContext; import org.springframework.web.context.support.WebApplicationContextUtils; import com.yun.project.service.UserService; import com.yun.project.util.Out;//Out是我将System.out.println()给封装了 //即Out.println(String)等价于System.out.println(String) public class UserServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // TODO Auto-generated method stub //super.doGet(req, resp); doPost(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // TODO Auto-generated method stub //super.doPost(req, resp); Out.println("到doPost了"); UserService userService = (UserService) getBean("userService1");//取出Spring中的userService1 userService.sayHello(); Out.println("这是learnSpring1中的"); } private Object getBean(String beanId){ ServletContext servletContext = this.getServletContext();  Out.println(servletContext==null?"是null":"不是null"); ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(servletContext);   Object myDao = context.getBean(beanId);   return myDao; } }

接下来是web.xml中的配置，内容如下：

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">   <display-name>LearnSpring1</display-name>   <welcome-file-list>     <welcome-file>index.jsp</welcome-file>   </welcome-file-list>   <context-param>  <param-name>contextConfigLocation</param-name>  <param-value>  classpath*:Spring*.xml  </param-value>    </context-param>     <listener>     <listener-class>              org.springframework.web.context.ContextLoaderListener          </listener-class>   </listener>   <listener> <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>   </listener>   <servlet>   <servlet-name>user</servlet-name>   <servlet-class>com.yun.project.servlet.UserServlet</servlet-class>   </servlet>   <servlet-mapping>   <servlet-name>user</servlet-name>   <url-pattern>/user</url-pattern>   </servlet-mapping> </web-app>

注，我没有给出userService的sayHello()，不过这没有涉及到spring的配置了，随便你怎么写。

需要的jar，我在这就不给出了。

(adsbygoogle = window.adsbygoogle || []).push({});