GWT 简单 RPC 用例问题:包含代码 [英] GWT Simple RPC use case problem : Code included
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问题描述
我正在尝试研究如何使用 GWT RPC 将域对象从服务器端发送到客户端.我编写了一个非常简单的用例，它代表了我(和其他人?)需要能够做但目前无法开始工作的那种事情.
I am trying to work out how to send a domain object from the server-side to the client-side using GWT RPC. I've coded a really simple use case that represents the sort of thing I (and others?) need to be able to do but presently can't get to work.
我已经搜索了文档、教程和论坛，但它们要么显示字符串被传递，要么提供(当我将它们应用于此时)仍然不起作用的解释.
I have scoured the docs, tutorials and forums but they either show Strings being passed around or offer explanations that (when I apply them to this) still don't work.
希望有人可以向我和其他人解释为什么此代码不起作用以及如何使其起作用.
Hopefully someone can explain to me and others why this code doesn't work and how to get it to work.
谢谢.
这是错误消息.
13:12:54.328 [DEBUG] [org.redboffin.worldhug.Test] Validating newly compiled units
13:12:54.328 [ERROR] [org.redboffin.worldhug.Test] Errors in 'file:/C:/Documents%20and%20Settings/Darren/workspace/WorldHug/src/org/redboffin/worldhug/client/test/TestService.java'
13:12:54.343 [ERROR] [org.redboffin.worldhug.Test] Line 14: No source code is available for type org.redboffin.worldhug.server.test.TestObject; did you forget to inherit a required module?
13:12:54.515 [ERROR] [org.redboffin.worldhug.Test] Errors in 'file:/C:/Documents%20and%20Settings/Darren/workspace/WorldHug/src/org/redboffin/worldhug/client/test/TestServiceAsync.java'
13:12:54.515 [ERROR] [org.redboffin.worldhug.Test] Line 12: No source code is available for type org.redboffin.worldhug.server.test.TestObject; did you forget to inherit a required module?
13:12:55.953 [ERROR] [org.redboffin.worldhug.Test] Errors in 'file:/C:/Documents%20and%20Settings/Darren/workspace/WorldHug/src/org/redboffin/worldhug/client/test/TestView.java'
13:12:55.968 [ERROR] [org.redboffin.worldhug.Test] Line 42: No source code is available for type org.redboffin.worldhug.server.test.TestObject; did you forget to inherit a required module?
13:12:55.968 [ERROR] [org.redboffin.worldhug.Test] Line 46: No source code is available for type org.redboffin.worldhug.server.test.InnerObject; did you forget to inherit a required module?
13:12:55.984 [ERROR] [org.redboffin.worldhug.Test] Line 48: No source code is available for type org.redboffin.worldhug.server.test.ListObject; did you forget to inherit a required module?
13:12:56.765 [INFO] [org.redboffin.worldhug.Test] Module org.redboffin.worldhug.Test has been loaded
这里是项目类和文件.
Test.gwt.xml
Test.gwt.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.0.0//EN" "http://google-web-toolkit.googlecode.com/svn/tags/2.0.0/distro-source/core/src/gwt-module.dtd">
<module>
<inherits name="com.google.gwt.user.User" />
<source path="client/test" />
<entry-point class="org.redboffin.worldhug.client.test.Test"></entry-point>
</module>
Web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<!-- Servlets -->
<servlet>
<servlet-name>testServlet</servlet-name>
<servlet-class>org.redboffin.worldhug.server.test.TestServiceImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>testServlet</servlet-name>
<url-pattern>/worldhug/test/testService</url-pattern>
</servlet-mapping>
<!-- Default page to serve -->
<welcome-file-list>
<welcome-file>test.html</welcome-file>
</welcome-file-list>
</web-app>
TestObject.java
TestObject.java
package org.redboffin.worldhug.server.test;
import java.util.ArrayList;
import java.util.List;
import com.google.gwt.user.client.rpc.IsSerializable;
public class TestObject implements IsSerializable {
private String testObjectString;
private InnerObject innerObject;
private List<ListObject> listObjects = new ArrayList<ListObject>();
public TestObject() {}
// Getters and setters removed for brevity
}
InnerObject.java
InnerObject.java
package org.redboffin.worldhug.server.test;
import com.google.gwt.user.client.rpc.IsSerializable;
public class InnerObject implements IsSerializable {
private String innerObjectString;
public InnerObject() {}
// Getters and setters removed for brevity
}
ListObject.java
ListObject.java
package org.redboffin.worldhug.server.test;
import com.google.gwt.user.client.rpc.IsSerializable;
public class ListObject implements IsSerializable {
private String listObjectString;
public ListObject() {}
// Getters and setters removed for brevity.
}
TestService.java
TestService.java
package org.redboffin.worldhug.client.test;
import org.redboffin.worldhug.server.test.TestObject;
import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
/**
* The client side stub for the Test Service.
* @author Darren
*/
@RemoteServiceRelativePath("testService")
public interface TestService extends RemoteService {
TestObject test();
}
TestServiceAsync.java
TestServiceAsync.java
package org.redboffin.worldhug.client.test;
import org.redboffin.worldhug.server.test.TestObject;
import com.google.gwt.user.client.rpc.AsyncCallback;
/**
* The async counterpart of <code>TestService</code>.
* @author Darren
*/
public interface TestServiceAsync {
void test(AsyncCallback<TestObject> callback);
}
TestServiceImpl.java
TestServiceImpl.java
package org.redboffin.worldhug.server.test;
import java.util.List;
import org.redboffin.worldhug.client.test.TestService;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
/**
* The server side implementation of the RPC service.
* @author Darren
*/
@SuppressWarnings("serial")
public class TestServiceImpl extends RemoteServiceServlet implements TestService {
@Override
public TestObject test() {
TestObject testObject = new TestObject();
testObject.setTestObjectString("Test Object String");
InnerObject innerObject = new InnerObject();
innerObject.setInnerObjectString("Inner Object String");
testObject.setInnerObject(innerObject);
List<ListObject> listObjects = testObject.getListObjects();
ListObject listObjectOne = new ListObject();
listObjectOne.setListObjectString("List Object One");
listObjects.add(0, listObjectOne);
ListObject listObjectTwo = new ListObject();
listObjectTwo.setListObjectString("List Object Two");
listObjects.add(0, listObjectTwo);
ListObject listObjectThree = new ListObject();
listObjectThree.setListObjectString("List Object Three");
listObjects.add(0, listObjectThree);
return testObject;
}
}
TestView.java
TestView.java
package org.redboffin.worldhug.client.test;
import java.util.ArrayList;
import java.util.Iterator;
import org.redboffin.worldhug.server.test.InnerObject;
import org.redboffin.worldhug.server.test.ListObject;
import org.redboffin.worldhug.server.test.TestObject;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.uibinder.client.UiHandler;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.VerticalPanel;
public class TestView extends Composite {
private static TestViewUiBinder uiBinder = GWT.create(TestViewUiBinder.class);
interface TestViewUiBinder extends UiBinder<VerticalPanel, TestView> {}
@UiField Label testObjectStringLabel;
@UiField Label innerObjectStringLabel;
@UiField VerticalPanel listObjectsPanel;
@UiField Button button;
@UiField Label errorMessageLabel;
public TestView(String firstName) {
initWidget(uiBinder.createAndBindUi(this));
}
@UiHandler("button")
void onClick(ClickEvent e) {
TestServiceAsync testService = (TestServiceAsync) GWT.create(TestService.class);
AsyncCallback<TestObject> callback = new AsyncCallback<TestObject>() {
public void onSuccess(TestObject testObject) {
testObjectStringLabel.setText(testObject.getTestObjectString());
InnerObject innerObject = testObject.getInnerObject();
innerObjectStringLabel.setText(innerObject.getInnerObjectString());
ArrayList<ListObject> listObjects = (ArrayList<ListObject>) testObject.getListObjects();
Iterator<ListObject> iterator = listObjects.iterator();
while(iterator.hasNext()) {
ListObject listObject = (ListObject) iterator.next();
listObjectsPanel.add(new Label(listObject.getListObjectString()));
}
}
public void onFailure(Throwable caught) {
errorMessageLabel.setText("Error : "+caught.getMessage());
}
};
testService.test(callback);
}
}
TestView.ui.xml
TestView.ui.xml
<!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent">
<ui:UiBinder
xmlns:ui="urn:ui:com.google.gwt.uibinder"
xmlns:g="urn:import:com.google.gwt.user.client.ui">
<g:VerticalPanel>
<g:Label>Test Object</g:Label>
<g:Label ui:field="testObjectStringLabel"></g:Label>
<g:VerticalPanel>
<g:Label>Inner Object</g:Label>
<g:Label ui:field="innerObjectStringLabel"></g:Label>
</g:VerticalPanel>
<g:VerticalPanel ui:field="listObjectsPanel">
<g:Label>List Objects</g:Label>
</g:VerticalPanel>
<g:Button ui:field="button">Display Test Object</g:Button>
<g:Label ui:field="errorMessageLabel"></g:Label>
</g:VerticalPanel>
</ui:UiBinder>
感谢您阅读到这里，并感谢您为我(和其他人)提供的任何帮助.
Thank you for reading this far and for any help you may be able to give me (and others).
推荐答案
您需要标识包含要进行 GWT 编译的源代码的所有包.
You need to identify all packages that contain source that is to be GWT compiled.
例如
<source path="client/test"/>
<source path="server/test"/>
将域类放在服务器包中可能是更好的选择.我们经常做这样的事情:
It might be a better option to put your domain classes NOT in the server package. We often do this kind of thing:
<source path="client"/>
<source path="shared"/>
其中 shared 包含在客户端和服务器之间来回传递的 DTO.
where shared contains the DTOs passed back and forth between client and server.
这篇关于GWT 简单 RPC 用例问题:包含代码的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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