Spring 自学系列之IOC-2

初识spring的IOC
（1）service层package com.bjsxt.service;
import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

public class UserService {
private UserDAO userDAO;
public void add(User user) {
userDAO.save(user);
}
public UserDAO getUserDAO() {
return userDAO;
}
public void setUserDAO(UserDAO userDAO) {
this.userDAO = userDAO;
}
}（2）dao层package com.bjsxt.dao;
import com.bjsxt.model.User;

public interface UserDAO {
public void save(User user);
}（3）dao实现层【daoImpl】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!");
}

}（4）model层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;
}
}（5）外部调用层【测试】package com.bjsxt.service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bjsxt.model.User;

//Dependency Injection
//Inverse of Control
public class UserServiceTest {

@Test
public void testAdd() throws Exception {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

UserService service = (UserService)ctx.getBean("userService");

User u = new User();
u.setUsername("zhangsan");
u.setPassword("zhangsan");
service.add(u);
}

}