基于Annotation的配置

要想知道怎样使用Annotation来配置bean就的知道命名空间：

一,    要先指定命名空间的名称

二,    指定命名空间的Schema文档样式文件的location

 

下面就是一个简单的基于Annotation配置的程序(在此程序中有多个userDao所以要指定是那个userDao)

注意：一般是使用@Resource不用@Autowired

package com.lbx.service.impl;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;

import com.lbx.dao.UserDao;
import com.lbx.po.User;
import com.lbx.service.UserService;

public class UserServiceImpl implements UserService {
	private UserDao userDao;
	
	public void init(){
		System.out.println("UserServiceImpl.init()");
	}
	
	@Override
	public void add(User user) {
		userDao.add(user);
	}
	
	public UserDao getUserDao() {
		return userDao;
	}
	
	@Autowired//(required=false)
	public void setUserDao(@Qualifier(value="userDao") UserDao userDao) { //也可以@Qualifier("userDao")
		//@Qualifier一般都写在set方法上 @Qualifier(required=false)意思就是不必须的
		this.userDao = userDao;
	}

	public void destroy(){
		System.out.println("UserServiceImpl.destroy()");
	}
	
}

 

 

bean.xml配置文件

<?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-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:annotation-config />

<bean id="userDao" class="com.lbx.dao.impl.UserDaoImpl"></bean>
<bean id="userDao1" class="com.lbx.dao.impl.UserDaoImpl"></bean>

<bean id="userService" class="com.lbx.service.impl.UserServiceImpl">
</bean>

</beans>