Java动态获取某个接口下所有的实现类对象集合

欢迎大家关注github.com/hsfxuebao/j… ，希望对大家有所帮助，要是觉得可以的话麻烦给点一下Star哈

场景：MyServiceImpl1 和 MyServiceImpl2 都实现了 MyService接口

@Service
public class MyServiceImpl1 implements MyService {
    @Override
    public Type getType() {
        return Type.ONE;
    }
    // ...
}

@Service
public class MyServiceImpl2 implements MyService {
    @Override
    public Type getType() {
        return Type.TWO;
    }
    // ...
}

方式1，通过set注入

@Component
public class InitializeTest {
 
    private static Map<Type, MyService> myServiceMap = new LinkedHashMap<>();
 
    @Autowired(required = false)
    public void setMyServices(List<MyService> services) {
        myServiceMap.clear();
        for (MyService service : services) {
            myServiceMap.put(service.getType(), service);
        }
    }
 
    public static MyService getMyServiceByType(Type type) {
        return myServiceMap.get(type);
    }
}

方式2， 通过反射获取同一包下的，都实现了MyService接口的实现类

@Component
public class MyCommandRunner implements CommandLineRunner {
 
    @Autowired
    private ApplicationContext applicationContext;
 
    private static Map<Type, MyService> myServiceMap = new LinkedHashMap<>();
 
    @Override
    public void run(String... args) {
        // MyCommandRunner 与实现了MyService接口的实现类位于同一包下
        Reflections reflections = new Reflections(this.getClass().getPackage().getName());
        Set<Class<? extends MyService>> myClasses = reflections.getSubTypesOf(MyService.class);
        for (Class<? extends MyService> myClass : myClasses) {
            MyService myService = applicationContext.getBean(monitor);
            myServiceMap.put(myService.getType(), myService);
        }
    }
 
    public static MyService getMyServiceByType(Type type) {
        return myServiceMap.get(type);
    }
}

转自：blog.csdn.net/weixin_4188…