#眉標=GAE/J、Maven、Eclipse
#副標=直上Google App Engine雲端運算平台(2)
#大標=架構師如何掌握GAE/J專案？
#作者=文／圖 盧建州



==<box>===========
程式1：DemoTest.java

package demo.gae.test;
public class DemoTest extends BaseGaeTestCase {
 public void testEmailGetsSent() {
 ApiProxyLocalImpl proxy =
    (ApiProxyLocalImpl) ApiProxy.getDelegate();
 LocalMailService mailService =
    (LocalMailService) proxy.getService("mail");
 mailService.clearSentMessages();
  assertEquals(
   0,mailService.getSentMessages().size());
 }
} 
==<end>==============




==<box>===========
程式2：HelloWorldGwtTest.java

package demo.gae.example.helloworld.client;
import com.google.gwt.junit.client.GWTTestCase;
public class HelloWorldGwtTest extends GWTTestCase {
 @Override
  public String getModuleName() {
   return "demo.gae.example.helloworld.HelloWorld";
 }

 public void testUI1() {
   HelloWorld app = new HelloWorld();
   app.onModuleLoad();
 }
} 
==<end>==============




==<box>===========
測試報告1
---------------------
Test set: … HelloWorldGwtTest
---------------------
Tests run: …, Errors: … : <<< FAILURE!
testUI1(….HelloWorldGwtTest) : <<< ERROR!
java.lang.NullPointerException
  at…HelloWorld.onModuleLoad(HelloWorld.java:50)
  at…testUI1(HelloWorldGwtTest.java:14) 
==<end>==============






==<box>===========
程式3：HelloWorld.java

package demo.gae.example.helloworld.client;
…中間省略…
public class HelloWorld implements EntryPoint {
…中間省略…
  public void onModuleLoad() {
    // 設定垂直佈局面板
    VerticalPanel verticalPanel = new VerticalPanel();
    verticalPanel.setHorizontalAlignment(
      HasHorizontalAlignment.ALIGN_CENTER);
    verticalPanel.setSize("100%", "50%");
    // 設定UI標題與提示訊息
    final Label titleLabel =
      new Label("Web Application Starter Project");
    final Label enterMsgLabel =
      new Label("Please enter your name:");
    //設定UI輸入框與送出按鈕
    final TextBox nameField = new TextBox();
    nameField.setText("GWT User");
    nameField.setFocus(true);
    nameField.selectAll();

    final Button sendButton = new Button("Send");
    sendButton.addStyleName("sendButton");
    //將UI元件加入佈局面板
    verticalPanel.add(titleLabel);
    verticalPanel.add(enterMsgLabel);
    verticalPanel.add(nameField);
    verticalPanel.add(sendButton);
    // 將佈局面板加入至父面板
    RootPanel rootPanel = RootPanel.get();
    rootPanel.add(verticalPanel, 0, 0);

    …中間省略-建立彈出式對話框…
    …中間省略-建立MyHandler事件處理類別…
    //宣告事件處理者並加入於指定的UI中
    MyHandler handler = new MyHandler();
    /*
    以下的二個新增事件處理者函式，可能在GWT Designer
    進行佈局時被移到handler宣告之上造成無法編譯的錯誤。
    */
    sendButton.addClickHandler(handler);
    nameField.addKeyUpHandler(handler);
  }
} 
==<end>==============





==<box>===========
參考資源
●Google整理的開放原始碼相容性清單：http://groups.google.com/group/google-appengine-java/web/will-it-play-in-app-engine pli=1。
●JRE於GAE可用的白名單：http://code.google.com/intl/zh-TW/appengine/docs/java/jrewhitelist.html。
==<end>==============