关于@Autowired的使用及注意事项

@Autowired
@Qualifier("属性名")

@Component
@Slf4j
public class SomeClass {

    @Autowired
    //这种方式会报错，因为存在两个TestInterface类型的bean
    private TestInterface testInterface;
    
	//不会报错，因为此时相当于
	/*
	@Autowired
	@Qualifier("testClass1")
	*/
	@Autowired
	private TestInterface testClass1;

    public TestInterface getTestClass() {
        return testClass1;
    }
}

@Component
@Primary
public class TestClass2 implements TestInterface {
    private String s="testClass2";

    public String getS() {
        return s;
    }
}

@Autowired
	private TestInterface testClass1;

@RestController
@RequestMapping("/student/card")
public class CardController {
    @Autowired
    CardService cardService;
}

@RestController
@RequestMapping("/student/card")
public class CardController {
    
    CardService cardService;
    
    @Autowired
    public void setCardService(CardService cardService) {
        this.cardService = cardService;
    }
}

public SomeClass someClass(@Autowired @Qualifier("card") Card card)

	@Bean
    public SomeClass someClass(@Autowired Card card){
        SomeClass someClass=new SomeClass();
        someClass.setCard(card);
        return someClass;
    }
    
    @Bean
    public Card card(){
        Card card=new Card();
        card.setStudentId("01");
        return card;
    }

	@Autowired
    @Qualifier("beanName")
    private MybatisCardMapper mapper;