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>