Spring整合web项目演示

1 演示问题
（1）action调用service，service调用dao

把ApplicationContext context =
                new ClassPathXmlApplicationContext("bean1.xml"); 把这个代码放在这里，整个项目只会加载一次

package cn.itcast.action;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.opensymphony.xwork2.ActionSupport;

import cn.itcast.service.UserService;

public class UserAction extends ActionSupport {

	@Override
	public String execute() throws Exception {
		System.out.println("action..........");
		ApplicationContext context = 
				new ClassPathXmlApplicationContext("bean1.xml");
		UserService userService = (UserService) context.getBean("userService");
		userService.add();
		return NONE;
	}
}

package cn.itcast.dao;

public class UserDao {

	public void add() {
		System.out.println("dao..........");
	}
}

package cn.itcast.service;

import cn.itcast.dao.UserDao;

public class UserService {
	
	private UserDao userDao;
	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}

	public void add() {
		System.out.println("service..........");
		userDao.add();
	}
}

<?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">
	
	<bean id="userService" class="cn.itcast.service.UserService">
		<property name="userDao" ref="userDao"></property>
	</bean>
	<bean id="userDao" class="cn.itcast.dao.UserDao"></bean>
</beans>

 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
	<package name="demo1" extends="struts-default" namespace="/">
		<action name="userAction" class="cn.itcast.action.UserAction"></action>
	</package>
</struts>

<?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_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>spring_day02_webdemo</display-name>
  
  	<!-- 指定spring配置文件位置 -->
  	<context-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:bean1.xml</param-value>
  	</context-param>
  	
      <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <!-- 配置监听器 -->
    <listener>
    	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>