If else 策略 工厂设计

/**
 * 面向接口编程
 */
public interface IService {
    void handle();
    String putType();
}

/**
 * 枚举
 */
public enum  TypeEnum {
    //
    a, b, c, d, e;
}

/**
 * A实现类
 */
@Service
public class AServiceImpl implements IService {
    @Override
    public void handle() {
        System.out.println("A测试");
    }
    @Override
    public String putType() {
        return TypeEnum.a.name();
    }
}

/**
 * B实现类
 */
@Service
public class BServiceImpl implements IService {
    @Override
    public void handle() {
        System.out.println("B测试");
    }
    @Override
    public String putType() {
        return TypeEnum.b.name();
    }
}

/**
 * 工厂方法
 */
@Service
public class ServiceFactory {
    private final Map<String, IService> map = new ConcurrentHashMap<>();
    public ServiceFactory(List<IService> iServices) {
        iServices.forEach(s -> map.put(s.putType(), s));
    }
    public IService getService(String type) {
        if (null == type || type.isEmpty()) {
            System.out.println("类型为空");
        }
        return map.get(type);
    }
}

/**
 * 接口调用
 */
@RestController
public class FactoryRest {
    @Autowired
    private ServiceFactory serviceFactory;
    @RequestMapping("/test")
    public void test(String type) {
        IService service = serviceFactory.getService(type);
        if (null == service) {
            System.out.println("接口为空！");
        }
        service.handle();
    }
}