@Component, 没有角色
@Controller, 为mvc的展现层
@RestController, springboot中使用, 相当于 @Controller和@ResponseBody
@Service, 为Service层
@Repositoy, 为数据交互层

@Autowired
@Resource: JSR-250
@Inject: JSR-330

package com.wenbronk.config.annotation;import org.springframework.stereotype.Service;/*** Created by wenbronk on 2017/5/12.*/
@Service
public class TestService {public String sayHello(String hello) {return "Hello" + hello;}}

package com.wenbronk.config.annotation;import org.springframework.stereotype.Service;import javax.annotation.Resource;/*** Created by wenbronk on 2017/5/12.*/
@Service
public class TestController {@Resourceprivate TestService testService {　　　　public String sayHello(String word) {return testService.sayHello(word);}}

package com.wenbronk.config.annotation;import org.springframework.boot.SpringBootConfiguration;
import org.springframework.context.annotation.ComponentScan;/*** Created by wenbronk on 2017/5/12.*/
@SpringBootConfiguration
@ComponentScan(value = {"com.wenbronk.config.annotation"})
public class AnnotationConfig {}

package com.wenbronk.config.annotation;import org.springframework.context.annotation.AnnotationConfigApplicationContext;/*** Created by wenbronk on 2017/5/12.*/public class TestAnnotation {public static void main(String[] args) {AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AnnotationConfig.class);TestController user = context.getBean(TestController.class);String sayHello = user.sayHello("你好");System.out.println(sayHello);}
}

package com.wenbronk.config.java;import org.springframework.boot.SpringBootConfiguration;
import org.springframework.context.annotation.Bean;/*** 除了使用上面那种方法, 还可以直接new* Created by wenbronk on 2017/5/12.*/
@SpringBootConfiguration
public class JavaConfig2 {@Beanpublic FunctionService functionService() {return new FunctionService();}

/*** spring容器中有的bean, 可以直接作为参数传入* @param functionService* @return*/@Beanpublic UserFunctionService userFunctionService(FunctionService functionService) {UserFunctionService userFunctionService = new UserFunctionService();userFunctionService.setFunctionService(functionService);return userFunctionService;}}

package com.wenbronk.config.java;import org.springframework.context.annotation.AnnotationConfigApplicationContext;/*** Created by root on 2017/5/12.*/
public class TestJava {public static void main(String[] args ) {AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(JavaConfig2.class);TestController bean = context.getBean(TestController.class);String hello = bean.sayHello("hello");System.out.println(hello);}
}