[Java知识库]Spring中使用@Autowired注入map

@Autowired
private Map<String, T> map = new HashMap<>();// 向map中注入spring容器中所有类型为T类型的bean,其中键为bean的名称,值为bean的实例.
比如 value为 BizService对象，那么key就是bizService

1.创建父接口

public interface SendMsgProvider {
}

2.分别创建三个实现类

@Service
public class AliSendMsgProviderImpl implements  SendMsgProvider{
}

@Service
public class BaoliSendMsgProviderImpl implements  SendMsgProvider{
}

@Service
public class NullSendMsgProviderImpl implements  SendMsgProvider{
}

3.控制层的方法
@RestController
@RequestMapping("")
public class ActiveController {

    @Autowired
    private Map<String, SendMsgProvider> sendMsgProviderMap;

    @GetMapping("")
    public void test(){
        System.out.println(sendMsgProviderMap.getClass().getName());
        for(Map.Entry<String,SendMsgProvider> sendMsgProviderMap.entrySet()){
            System.out.println(map.getKey()+"=========>"+map.getValue().getClass().getName());
        }
    }
}

4.启动程序并使用postMan调用这个接口，看控制台输出

java.util.LinkedHashMap
experienceAct=========>com.sms.ActivityDesign.AliSendMsgProviderImpl 
groupAct=========>com.sms.ActivityDesign.BaoliSendMsgProviderImpl 
inviteCardAct=========>com.sms.ActivityDesign.NullSendMsgProviderImpl