package com.swift;public class User { private String userName;  public void setUserName(String userName) {  this.userName = userName; } public String fun() {  return "User's fun is ready."+this.userName; }}

<?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:p="http://www.springframework.org/schema/p" xsi:schemaLocation="  http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><!-- IoC 控制反轉 SpringSpring根據XML配置文件生成對象 --><bean id="user" class="com.swift.User" p:userName="peach"></bean></beans>

package com.swift;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;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;@WebServlet("/test")public class TestIOC extends HttpServlet { private static final long serialVersionUID = 1L; public TestIOC() {  super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  response.getWriter().append("Served at: ").append(request.getContextPath());  @SuppressWarnings("resource")  //就是下邊這幾句了  ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");  User user=(User) context.getBean("user");  String userInfo=user.fun();  response.getWriter().println();  response.getWriter().append(userInfo); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  doGet(request, response); }}