Spring IOC简介（代码）

 尚学堂

包： spring.jar  commoms-logging.jar [2.5.6在dist 和 lib 里]

1。 userDAO.java

package com.bjsxt.dao;
import com.bjsxt.model.User;


public interface UserDAO {
	public void save(User user);
}

2。 UserDAOImpl.java 

package com.bjsxt.dao.impl;
import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;
public class UserDAOImpl implements UserDAO {
	public void save(User user) {
		//Hibernate
		//JDBC
		//XML
		//NetWork
		System.out.println("user saved!");
	}
}

3。User.java

package com.bjsxt.model;
public class User {
	private String username;
	private String password;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
}

4.UserService.java

package com.bjsxt.service;
import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;
public class UserService {
	//未使用new 控制反转（IOC），使用了beans.xml new 出来了
	private UserDAO userDAO;  
	public void add(User user) {
		userDAO.save(user);
	}
	//Getter and Setter

         public UserDAO getUserDAO() {
		return userDAO;
	}
	public void setUserDAO(UserDAO userDAO) {
		this.userDAO = userDAO;
	}
}

5。 beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<!-- 相当于一个new UserDAOImpl() -->
  <bean id="u" class="com.bjsxt.dao.impl.UserDAOImpl">
  </bean>
	
 <!-- 相当于一个new UserService() -->	
  <bean id="userService" class="com.bjsxt.service.UserService">
  	<property name="userDAO" ref="u" />
  </bean>
</beans>