gwt简单服务端返回数据代码

package com.mooing.client; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.core.client.GWT; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.rpc.ServiceDefTarget; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.ClickListener; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.RootPanel; import com.google.gwt.user.client.ui.Widget; public class LoginTest implements EntryPoint { public void onModuleLoad() { final LoginServiceAsync loginService = (LoginServiceAsync) GWT.create(LoginService.class); ServiceDefTarget target = (ServiceDefTarget) loginService; String staticResponseURL = GWT.getModuleBaseURL(); staticResponseURL += "/loginAction"; target.setServiceEntryPoint(staticResponseURL); final Label label = new Label(); final Button button = new Button("Get String"); button.addClickListener(new ClickListener() { public void onClick(Widget sender) { loginService.checkLogin(new AsyncCallback() { public void onSuccess(Object result) { label.setText((String) result); } public void onFailure(Throwable caught) { label.setText(caught.getMessage()); } }); } }); RootPanel.get().add(button); RootPanel.get().add(label); } }