spring_annotation_DI（autoware&resoure）

一。引入jar包
spring.jar    commons-loggion-1.0.4.jar

二。springIOC，是把一个对象注入到另一个对象。
   处理接口

package com.job.dao;

import com.job.model.User;

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

  接口实现

package com.job.dao;

import com.job.model.User;

public class UserDAOImpl implements UserDAO{

	@Override
	public void save(User u) {
		System.out.println(u.getUsername()+"---haha!");
	}
}

  服务层

public class UserService {
	
	private UserDAO userDAO;
	
	public void add(User u){
		this.userDAO.save(u);
	}

	public UserDAO getUserDAO() {
		return userDAO;
	}
	@Autowired
	public void setUserDAO(@Qualifier("userDAOImpl")UserDAO userDAO) {
		this.userDAO = userDAO;
	}
	
}

@Autowired 注释是自动注入配置文件存在的与当前类属性类型一致的类（默认bytype），
@Qualifier("userDAOImpl")是指定配置文件中存在的bean的ID或name

也可用@Resource(name="employDAOImpl")，@Resource默认配置文件中存在的bean的ID或name


  实体类

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;
	}
	
}

  spring的application.xml配置(使用annotation的autoware自动注入)

<?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"
		xmlns:tx="http://www.springframework.org/schema/tx"
		xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
				http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
				http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd" >
	
	<context:annotation-config />
	
	<bean id="userService" class="com.job.service.UserService" >
	</bean>

	<bean id="userDAOImpl" class="com.job.dao.UserDAOImpl" lazy-init="true" >
	</bean>
	
	<bean id="employDAOImpl" class="com.job.dao.EmployDAOImpl" lazy-init="true" >
	</bean>
	
	
</beans>

配置<context:annotation-config />初始化annotation组件及其它功能
配置javabean


  测试

public class UserServiceTest {
	@Test
	public void test(){
		ApplicationContext ac =  new ClassPathXmlApplicationContext("applicationContext.xml");
		UserService service = (UserService)ac.getBean("userService");
		User u = new User();
		u.setUsername("me haha  ");
		service.add(u);
		
	}
}

ClassPathXmlApplicationContext方法不写路径，则默认读取项目根路径src下applicationContext.xml文件

测试结果

引用

me haha  ---haha!