spring中一个接口出现多个实现类时，调用时如何选择实现类

@Componentpublic interface Aorder { void say();}

@Componentpublic class Corder implements Aorder{ @Override public void say() { System.out.println("----------Corder------------"); }}

@Componentpublic class Dorder implements Aorder{ @Override public void say() { System.out.println("----------Border------------"); }}

@RunWith(SpringRunner.class)@SpringBootTest(classes = Application.class)public class OrderTest { @Autowired private MyOrderTest myOrderTest; @Test public void say(){ myOrderTest.test(); }}

 此时会报错，调用Aorder时不知道调用哪一个bean

@Resource

@Servicepublic class MyOrderTest { @Resource(type = Corder.class) private Aorder aorder; public void test(){ aorder.say(); }}

此时就能正常调用了，但是Corder,Dorder都实现Aorder，此时Corder，Dorder 都生成了bean

@Primary

@Component@Primarypublic class Corder implements Aorder{ @Override public void say() { System.out.println("----------Corder------------"); }}

Corder,Dorder都实现Aorder，此时只有Corder会生成bean,Dorder不会生成bean