在Struts2模型中是继承

我有一个模型驱动的Struts2操作，提供了正确的JSON响应。 当我重新构造这个动作时，我得到一个空的JSON响应。 有没有人有继承工作与Struts2模型驱动的行动？

我曾试着在struts config中明确地设置include属性：

<result name="json" type="json">
   <param name="includeProperties">
      jsonResponse
   </param>
</result>

以下所有操作的代码 - 并非实际使用的代码 - 为了清晰起见，我已编辑并删除了该代码。

提前致谢。

提供正确回应的行动：

public class Bike extends ActionSupport implements ModelDriven, Preparable {

    @Autowired private Service bikeService;
    private JsonResponse jsonResponse;
    private com.ets.model.Vehicle bike;
    private int id;

    public Bike() {
        jsonResponse = new JsonResponse("Bike");
    }

    @Override
    public void prepare() throws Exception {
        if (id == 0) {
            bike = new com.ets.model.Bike();
        } else {
            bike = bikeService.find(id);
        }
    }

    @Override
    public Object getModel() {
        return bike;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setBikeService(@Qualifier("bikeService") Service bikeService) {
        this.bikeService = bikeService;
    }

    public JsonResponse getJsonResponse() {
        return jsonResponse;
    }

    public String delete() {
        try {
            bike.setDeleted(new Date(System.currentTimeMillis()));
            bikeService.updateOrSave(bike);
            jsonResponse.addActionedId(id);
            jsonResponse.setAction("delete");
            jsonResponse.setValid(true);
        } catch (Exception exception) {
            jsonResponse.setMessage(exception.toString());
        }
        return "json";
    }
}

重新构造的行为提供不正确的回应：

public abstract class Vehicle extends ActionSupport implements ModelDriven {

    @Autowired protected Service bikeService;
    @Autowired protected Service carService;
    protected JsonResponse jsonResponse;
    protected com.ets.model.Vehicle vehicle;
    protected int id;

    protected abstract Service service();

    @Override
    public Object getModel() {
        return bike;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setBikeService(@Qualifier("bikeService") Service bikeService) {
        this.bikeService = bikeService;
    }

    public void setCarService(@Qualifier("carService") Service carService) {
        this.carService = carService;
    }

    public JsonResponse getJsonResponse() {
        return jsonResponse;
    }

    public String delete() {
        try {
            vehicle.setDeleted(new Date(System.currentTimeMillis()));
            service().updateOrSave(vehicle);
            jsonResponse.addActionedId(id);
            jsonResponse.setAction("delete");
            jsonResponse.setValid(true);
        } catch (Exception exception) {
            jsonResponse.setMessage(exception.toString());
        }
        return "json";
    }

}

public class Bike extends Vehicle implements Preparable {

    public Bike() {
        jsonResponse = new JsonResponse("Bike");
    }

    @Override
    public void prepare() throws Exception {
        if (id == 0) {
            vehicle = new com.ets.model.Bike();
        } else {
            vehicle = bikeService.find(id);
        }
    }

    @Override
    protected Service service() {
        return bikeService;
    }

}

public class Car extends Vehicle implements Preparable {

    public Car() {
        jsonResponse = new JsonResponse("Car");
    }

    @Override
    public void prepare() throws Exception {
        if (id == 0) {
            vehicle = new com.ets.model.Car();
        } else {
            vehicle = carService.find(id);
        }
    }

    @Override
    protected Service service() {
        return carService;
    }

}

---

将特定于类型的代码移至子类，并修复getModel（）以返回正确的域对象：

public abstract class Vehicle extends ActionSupport
        implements ModelDriven, Preparable {

    protected int id;

    protected abstract Service service();
    public abstract void setService(Service service);
    public abstract JsonResponse getJsonResponse();

    public void setId(int id) {
        this.id = id;
    }

    public String delete() {
        JsonResponse jsonResponse = getJsonResponse();
        try {
            getModel().setDeleted(new Date(System.currentTimeMillis()));
            service().updateOrSave(getModel());
            jsonResponse.addActionedId(id);
            jsonResponse.setAction("delete");
            jsonResponse.setValid(true);
        } catch (Exception exception) {
            jsonResponse.setMessage(exception.toString());
        }
        return "json";
    }
}

public class Bike extends Vehicle {

    @Autowired protected Service bikeService;
    private com.ets.model.Bike model;

    @Override
    public void prepare() throws Exception {
        if (id == 0) {
            model = new com.ets.model.Bike();
        } else {
            model = bikeService.find(id);
        }
    }

    @Override
    public Object getModel() {
        return model;
    }

    @Override
    protected Service service() {
        return bikeService;
    }

    @Override
    public void setService(@Qualifier("bikeService") Service bikeService) {
        this.bikeService = bikeService;
    }

    @Override
    public JsonResponse getJsonResponse() {
        return new JsonResponse("Bike");
    }
}

public class Car extends Vehicle {

    @Autowired protected Service carService;
    private com.ets.model.Car model;

    @Override
    public void prepare() throws Exception {
        if (id == 0) {
            model = new com.ets.model.Car();
        } else {
            model = carService.find(id);
        }
    }

    @Override
    public Object getModel() {
        return model;
    }

    @Override
    protected Service service() {
        return carService;
    }

    @Override
    public void setService(@Qualifier("carService") Service carService) {
        this.carService = carService;
    }

    @Override
    public JsonResponse getJsonResponse() {
        return new JsonResponse("Car");
    }
}

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