Question

我尝试将AutoBeans添加到我们的GWT应用程序中，以将我们的对象序列化为cookie，然后将其读回。

但是，在此之后我无法使用反序列化对象调用GWT RPC方法调用。任何人都可以提供有关RPC调用失败原因的任何见解吗？

演示：

public interface Worker {
    public String getTitle();

    public void setTitle(String title);
  }

  public interface WorkerFactory extends AutoBeanFactory {
    AutoBean<Worker> createWorker();
  }

  public class MyObject implements Worker {
    private String title;

    public MyObject() {
    }

    public String getTitle() {
      return title;
    }

    public void setTitle(String title) {
      this.title = title;
    }
  }

然后运行：

  @Test
  public void testMyObject() {
    MyObject obj = new MyObject();
    obj.setTitle("titely");

    WorkerFactory factory = AutoBeanFactorySource.create(WorkerFactory.class);
    AutoBean<Worker> bean = factory.create(Worker.class, obj);
    String json = AutoBeanCodex.encode(bean).getPayload();
    System.out.println("Json is: " + json);

    bean = AutoBeanCodex.decode(factory, Worker.class, json);
    Worker newObject = bean.as();
    System.out.println("Object title is: " + newObject.getTitle());
  }

......似乎按预期工作：

Json is: {"title":"titely"} 
Object title is: titely

但是现在我的RPC方法失败了，caught.getMessage()是null。

服务定义：

@RemoteServiceRelativePath("workerService")
interface WorkerService {
   public void doWork(Worker worker);
}

public interface WorkerServiceAsync {
  void doWork(Worker worker, AsyncCallback<Void> callback);
}

public class WorkerServiceImpl extends RemoteServiceServlet implements WorkerService {
  @Override
  public void doWork(Worker worker) {
      // Do stuff that never gets called
    }
}

由：

调用

WorkerServiceAsync WORKER_SERVICE = GWT.create(WorkerService.class);
WORKER_SERVICE.doWork(newObject, new AsyncCallback<Void>() {
      public void onSuccess(Void result) {
        Window.alert("Never get here!");
      }

      public void onFailure(Throwable caught) {
        Window.alert("Get here, but message is blank: " + caught.getMessage());
      }
    });

此外，我在服务器日志中看不到任何请求。

有人可以帮忙吗？非常感谢

Answer 1

我发现了如何使这项工作。

我没有声明服务接受interface Worker的类型，而是将其更改为接受序列化的JSON字符串作为参数，然后使用Jackson将其转换为服务器上所需的类型

这是有道理的，因为GWT中的AutoBean反序列化返回的对象类型只是一个声明的Worker接口类型......实际的对象类型是某种代理，并且该代理显然本身不可序列化

所以我在这里使用的解决方案是将客户端上GWT的序列化JSON字符串发送到服务器，服务器使用以下代码对同一Worker类进行反序列化：

// on the server
public void doWork(String jsonString) {
    ObjectMapper jsonHelper = new ObjectMapper();
    ObjectReader reader = jsonHelper.reader(new TypeReference<MyObject>() {});
    MyObject actualHardObject;
    try {
      actualHardObject = reader.readValue(jsonString);
    } catch (IOException e) {
      log.severe("Couldn't parse json param: " + e.getMessage());
    }

    // do whatever you want with actualHardObject now
}

使用AutoBeans将接口作为参数进行GWT RPC调用

1 个答案: