创建MyComponent，使用@Component

import org.springframework.stereotype.Component;

@Component//泛指组件，当组件不好归类的时候，我们可以使用这个注解进行标注。

public class MyComponent

{

public void hi(String name)

{

System.out.println("hi " + name + ",I am MyComponent");

}

}

创建MyController，使用@Controller

import org.springframework.stereotype.Controller;

@Controller//用于标注控制层组件

public class MyController

{

public void hi(String name)

{

System.out.println("hi " + name + ",I am MyController");

}

}

创建MyRepository，使用@Repository

@Repository//用于标注数据访问组件，即DAO组件

public class MyRepository

{

public void hi(String name)

{

System.out.println("hi " + name + ",I am MyRepository");

}

}

创建MyService，MyServiceImpl，使用@Service

创建MyService，MyServiceImpl，使用@Service

public interface MyService

{

void doSomeThing();

}

import org.springframework.stereotype.Service;

@Service//用于标注业务层组件

public class MyServiceImpl implements MyService

{

@Override

public void doSomeThing()

{

System.out.println("i am MyServiceImpl");

}

}

单元测试

在src/test/java/你的包名/你的项目名ApplicationTests编写对应的单元测试来验证是否可以成功注入

import org.junit.Test;

import org.junit.runner.RunWith;

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

import org.springframework.boot.test.context.SpringBootTest;

import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)

@SpringBootTest

public class DiApplicationTests

{

@Autowired//自动注入

private MyController myController;

@Autowired//自动注入

private MyRepository myRepository;

@Autowired//自动注入

private MyComponent myComponent;

@Autowired//自动注入实现了该接口的bean

private MyService myService;

@Test

public void contextLoads()

{

myController.hi("lierabbit");

myRepository.hi("lierabbit");

myComponent.hi("lierabbit");

myService.doSomeThing();

}

}