Spring学习笔记，完全注解开发

首先我们创建一个dao包，包中包含UserDao接口和它的实现类UserDaoImpl,并利用注解@Repository创建好该类的bean管理对象

package com.Spring5.dao;

public interface UserDao {
    public void update();
}

package com.Spring5.dao;

import org.springframework.stereotype.Repository;

@Repository
public class UserDaoImpl implements UserDao{
    @Override
    public void update() {
        System.out.println("put ... ... ... ...");
    }
}

然后创建一个service包，包中创建UserService类，并利用@Service创建该类的bean管理对象，且用@Autowired装配UserDao属性

package com.Spring5.service;

import com.Spring5.dao.UserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

@Service
public class UserService {
    @Resource(name = "userDaoImpl")
    private UserDao userDao;
    public void add(){
        System.out.println("add ..... ...");
        userDao.update();
    }
}

创建配置类

package com.Spring5.config;

import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration //作为配置类
@ComponentScan(basePackages = "com.Spring5")
public class SpringConfig {

}

@Configuration 用来使类作为配置类，@ComponentScan(basePackages = " ")用来指定需要需要扫描注解的包

创建测试类

public class Test1 {
    @Test
    public void test2(){
        ApplicationContext context=new AnnotationConfigApplicationContext(SpringConfig.class);
        UserService userService=context.getBean("userService",UserService.class);
        userService.add();
    }
}

其实就是把ClassPathXmlApplicationContext变成了AnnotationConfigApplicationContext
其他的和xml开发完全一样

运行测试类，运行结果如下