1.创建配置类，替代xml配置文件

package com.leo.spring5.config;

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

@Configurable // 作为配置类，替代xml文件
@ComponentScan(basePackages = {"com.leo"})
public class SpringConfig {

}

2.编写其他类

package com.leo.spring5.service;

import com.leo.spring5.dao.UserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class UserService {

    @Autowired
    private UserDao userDao;


    public void add() {
        System.out.println("service add ...");
        userDao.add();
    }
}

package com.leo.spring5.dao;

public interface UserDao {

    public void add();
}

package com.leo.spring5.dao;

import org.springframework.stereotype.Repository;

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

3.测试

package com.leo.spring5.test;

import com.leo.spring5.config.SpringConfig;
import com.leo.spring5.service.UserService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class TestSpring {

    @Test
    public void testService() {
       ApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);
        UserService userService = context.getBean("userService", UserService.class);
        System.out.println(userService);
        userService.add();
    }
}

4.执行

Spring5 完全注解开发_intellij-idea