controller、service、Repository、Component 、Configuration
package com.java.ioc;import com.java.ioc.Controller.HelloController;
import com.java.ioc.rep.UserRepository;
import com.java.ioc.service.UserService;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;@SpringBootApplication
public class DemoApplication {public static void main(String[] args) {//告诉Spring帮我们管理对象，ioc:五个类注解：controller    ConfigurableApplicationContext context= SpringApplication.run(DemoApplication.class, args);
1.//    HelloController tean=context.getBean(HelloController.class);
//    tean.prin();//    //等于HelloController helloController=new HelloController();
//    //helloController.prin();2.//    HelloController bean2=(HelloController) context.getBean("helloController");
//    bean2.prin();3.//    HelloController tean1=(HelloController) context.getBean("aaa");//@Controller("aaa")重命名
//    tean1.prin();4.//    HelloController bean3=context.getBean("helloController",HelloController.class);
//    bean3.prin();//
//    //ioc:类注解：service
//    UserService dean1=context.getBean(UserService.class);
//    dean1.p();
//
//    //ioc:类注解：Repository
//    UserRepository dean2=context.getBean(UserRepository.class);
//    dean2.p();
////ioc:类注解：Component //ioc:类注解：Configuration}}

eg:

相同点：Component的衍生注解

不同点：

@Controller:控制层，接收参数

（控制层必须使用Controller，其他可以替换但不建议，因为不同注解含义不同可能存在不必要麻烦）

@Service：业务逻辑层

@Repository：数据层

@Configuratrin:配置层

@Component:组件层（但边界不是很清晰）

@Bean

//Spring默认扫描路径为启动类所在路径
//@ComponentScan("com.java.ioc")//加这个后以这个为准@SpringBootApplication//启动类