整合Spring开发环境只需要引入spring-web-3.2.0.RELEASE.jar这个jar包就可以了,因为它已经帮我们做好了.

 

 

 

Spring整合web开发,不用每次都加载Spring环境了。

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package cn.itcast.service;public class UserService {     public void sayHello(){         System.out.println("Hello Spring web.....");          }}

package cn.itcast.servlet;import java.io.IOException;import java.io.PrintWriter;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.context.support.ClassPathXmlApplicationContext;*/import org.springframework.web.context.WebApplicationContext;import org.springframework.web.context.support.WebApplicationContextUtils;import cn.itcast.service.UserService;@SuppressWarnings("serial")public class UserServlet extends HttpServlet {//每次启动Servlet都会加载Spring的环境.每次运行都需要加载Spring的环境.Spring配置环境中的东西如果多了,每次加载Servlet就加载Spring环境肯定不行.    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        /*    ApplicationContext applicationContext  = new ClassPathXmlApplicationContext(                       "applicationContext.xml");               UserService userService =  (UserService) applicationContext.getBean("userService");               userService.sayHello();*/        //得把代码改了,否则每次都是来获取Spring的环境.        WebApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(getServletContext());//工具类WebApplicationContextUtils          UserService userService =  (UserService) applicationContext.getBean("userService");          userService.sayHello();    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {                doGet(request,response);    }}

     
       
        
        
            
       
        org.springframework.web.context.ContextLoaderListener
             
        
        
        
       
        contextConfigLocation
         
       
        classpath:applicationContext.xml
         
        
          
       
        This is the description of my J2EE component
           
       
        This is the display name of my J2EE component
           
       
        UserServlet
           
       
        cn.itcast.servlet.UserServlet
         
        
          
       
        UserServlet
           
       
        /userServlet
         
        
          
       
        index.jsp