Spring中@Primary注解的作用详解

  @Bean
	  public AMapper aMapper1(AConfig aConfig) {
	    return new AMapperImpl1(aConfig);
	  }
	  @Bean
	  @Primary
	  public AMapper aMapper2(AConfig aConfig) {
	    return new AMapperImpl2(aConfig);
	  }

public interface Worker {
	    public String work();
	}
	@Component
	public class Singer implements Worker {
	    @Override
	    public String work() {
	        return "歌手的工作是唱歌";
	    }
	}
	@Component
	public class Doctor implements Worker {
	    @Override
	    public String work() {
	        return "医生工作是治病";
	    }
	}
	// 启动，调用接口
	@SpringBootApplication
	@RestController
	public class SimpleWebTestApplication {
	    @Autowired
	    private Worker worker;
	    @RequestMapping("/info")
	    public String getInfo(){
	        return worker.work();
	    }
	    public static void main(String[] args) {
	        SpringApplication.run(SimpleWebTestApplication.class, args);
	    }
	}

@Component
@Primary
public class Doctor implements Worker {
    @Override
    public String work() {
        return "医生工作是治病";
    }
}