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我遇到了 RPC 调用和 GWT 的问题。本质上，我有一个Person类（客户端和服务器之间的公共代码），它是在客户端 Web 代码中创建的，通过 RPC 调用发送到服务器代码，然后保存到数据库（OrientDB）。我已经验证了以下工作：

  1. RPC 调用 - 我能够向服务器发送信息并从服务器检索信息
  2. 保存到数据库 - 已验证人员对象已保存到数据库

我遇到的问题是将 POJO 从客户端传输到服务器。我已经验证 POJO 的属性在它被发送到服务器之前是完整的，但是，传递给服务器的对象包含所有属性的空值。本质上，课程被转移，但信息没有。然后它保存到数据库中，但显然其中没有包含任何相关信息。

我将在下面复制我认为相关的内容，请让我知道我还能提供什么来使这个问题更容易识别。请注意，这些仍处于测试状态，因此请注意评论:)

知道为什么我的 POJO 的信息在翻译中丢失了吗？

Person对象，然后是它继承自的抽象类：

public class Person extends org.matesweb.shared.AbsPerson implements Serializable
{
    @Id 
    private String id; // DON'T CREATE GETTER/SETTER FOR IT TO PREVENT THE CHANGING BY THE USER APPLICATION, 
                       // UNLESS IT'S NEEDED

    //sets new user details
    public void setPerson(String fIrstName, String mIdInit, String lAstName, String email, String password)
    {
        firstName = fIrstName;
        middleInitial = mIdInit;
        lastName = lAstName;
    }

    /*getter and setter methods - required for every 
     * field due to restrictions imposed by OrientDB*/ 

    public Object getId()
    {
        String tmp;
        tmp = id.toString();
        return tmp;
    }
//end class  
}

public class AbsPerson implements Serializable
{
    String firstName;
    String middleInitial;
    String lastName;

  //  public sys.Login login;

    public org.matesweb.shared.Group[] groups;
    private org.matesweb.shared.Purchase[] purchases;


    /*this method adds a new purchase to the purchases variable*/
/*    public void addPurchase(float price, String description)
    {
        people.Purchase newPurchase = new people.Purchase(login, price, description);
    }
*/    
    /*adds a person to a group by comparing the passed in group ID and PWD*/
    public void addGroup(String groupID, String groupPWD)
    {
        //compare group ID with group PWD to add a user to the group
    }

    /*getter and setter methods - required for every 
     * field due to restrictions imposed by OrientDB*/
    public String getFirstName()
        {
            return firstName;
        }
    public void setFirstName(String name)
        {
            firstName = name;
        }       

    public String getMiddleInitial()
        {
            return middleInitial;
        }
    public void setMiddleInitial(String midInit)
        {
            middleInitial = midInit;
        }       

    public String getLastName()
        {
            return lastName;
        }
    public void setLastName(String ln)
        {
            lastName = ln;
        }       

    /*
    public sys.Login getLogin()
        {
            return login;
        }
    public void setLogin(sys.Login log)
        {
            login = log;
        }
    */

    public org.matesweb.shared.Group[] getGroups()
        {
            return groups;
        }
    public void setGroups(org.matesweb.shared.Group[] gro)
        {
            groups = gro;
        }       

    public org.matesweb.shared.Purchase[] getPurchases()
        {
            return purchases;
        }
    public void setPurchases(org.matesweb.shared.Purchase[] purch)
        {
            purchases = purch;
        }
}

服务

package org.matesweb.client;

import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
import org.matesweb.shared.Person;

@RemoteServiceRelativePath("peopleService")
public interface PeopleService extends RemoteService {

//test services
    String stringTest(String outgoingString);
    Person getPerson(String persId);

//production services
    String savePerson(Person p);
}

服务异步

import com.google.gwt.user.client.rpc.AsyncCallback;
import org.matesweb.shared.Person;

public interface PeopleServiceAsync
{
    //tests
    void stringTest(String outgoingString, AsyncCallback<String> incomingString);
    void getPerson(String persId, AsyncCallback<Person> retPerson);

    //production services
    void savePerson(Person p , AsyncCallback<String> st);
}

ServiceImpl调用此特定方法：

//production calls
    @Override
    public String savePerson(Person p) {
        String st = ioObj.saveObj(p);
        if(st.equals("Success")){
            return "Your information has been saved successfully!";
        } else{
            return "Something has gone wrong on our end... Sorry! Error:<br /> " + st;
        } 
    }

最后，调用本身

private static void savePerson(Person p)
    {        
        // Initialize the service proxy.
        if (peopleSvc == null) {
          peopleSvc = GWT.create(PeopleService.class);
        }

        //resets status
        st="";

        // Set up the callback object.
        AsyncCallback<String> callback = new AsyncCallback<String>() {
            @Override
            public void onFailure(Throwable caught) {
                st = caught.getMessage();
                Label stLabel= new Label(st);
                personTable.setWidget(3,1,stLabel);            
            }

            @Override
            public void onSuccess(String result) {
                st = result;
                HTML stLabel= new HTML(st);
                joinPanel.add(stLabel);
            }
        };
        // Make the call to the people service.
        peopleSvc.savePerson(p, callback);    
    }
4

1 回答 1

1

我可以通过实现 GWT 的 IsSerializable 接口来解决这个问题。我还从 Person 类中删除了 Serializable 接口，并让它从它继承的抽象类继承 IsSerializable 。

于 2012-12-20T20:39:34.093 回答