Spring使用注解方式实现

Spring框架注解配置示例

最新推荐文章于 2025-06-05 10:18:43 发布

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本文通过一个具体的例子展示了如何使用Spring框架进行基于注解的配置，包括DAO层、Service层的接口及其实现，并介绍了如何利用Spring的组件扫描功能来识别这些带有注解的类。

dao接口

package xinfei.code.dao;
public interface UserDao {
	public void save();
}

dao实现

package xinfei.code.dao.impl;

import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;

import xinfei.code.dao.UserDao;

@Component("userDao")
//@Repository("userDao")
public class UserDaoImpl implements UserDao{
	public void save() {
		System.out.println("执行了啊...");
	}
}

service接口

package xinfei.code.service;
public interface UserService {
	public void save();
}

service实现

package xinfei.code.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import xinfei.code.dao.UserDao;
import xinfei.code.service.UserService;
@Component("userService")
//@Service("userService")
public class UserServiceImpl implements UserService{
	@Autowired
	@Qualifier("userDao")
	private UserDao userDao;
	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}
	public void save() {
		System.out.println("调用了啊....");
		userDao.save();
	}
}

注解扫描器

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

		<!-- 开启注解扫描器 -->
		<context:component-scan base-package="xinfei.code"></context:component-scan>
</beans>

测试

package xinfei.code.springjunit;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import xinfei.code.service.UserService;

@ContextConfiguration("classpath:applicationContext.xml")
@RunWith(SpringJUnit4ClassRunner.class)
public class SpringJunjitTest {

	@Autowired
	private UserService userService;
	
	@Test
	public void test01(){
		userService.save();
	}
}