我开发了一个GWT电子邮件应用程序。当我运行它，它工作正常，并没有抛出任何错误，但邮件在我点击发送按钮后没有传递给收件人。我认为一定有些事我做错了。请，任何帮助将不胜感激。 提前致谢。以下是我的服务器和客户端代码的快照：
package com.ukstudentfeedback.server;
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import com.ukstudentfeedback.client.MailClient;
import com.ukstudentfeedback.shared.FieldVerifier;
@SuppressWarnings("serial")
public class MailServerImpl extends RemoteServiceServlet implements MailClient{
public String sendMessage(String to, String from, String subject, String message) throws IllegalArgumentException
{
// Verify that no input is null.
if (!FieldVerifier.isValidName(to, from, subject, message)) {
// If the input is not valid, throw an IllegalArgumentException back to
// the client.
throw new IllegalArgumentException(
"Name must be at least 4 characters long");
}
try
{
Properties props = new Properties();
props.put("smtp.gmail.com", "mail.google.com");
props.put("smtp.gmail.username","my email");
props.put("smtp.gmail.password","my password");
Session session = Session.getDefaultInstance(props, null);
Message msg = new MimeMessage(session);
InternetAddress me = new InternetAddress(from,
"Me");
InternetAddress you = new InternetAddress(to);
msg.setFrom(me);
msg.setRecipient(Message.RecipientType.TO, you);
msg.setSubject(subject);
msg.setContent(message,
"text/plain");
Transport.send(msg);
}
catch (AddressException e)
{
// ...
e.printStackTrace();
} catch (MessagingException e)
{
// ...
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return to;
}
}
客户代码：
package com.ukstudentfeedback.client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyUpEvent;
import com.google.gwt.event.dom.client.KeyUpHandler;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.DialogBox;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.ukstudentfeedback.shared.FieldVerifier;
import com.ukstudentfeedback.client.MailClient;
import com.ukstudentfeedback.client.MailClientAsync;
public class Ukstudentfeedback implements EntryPoint{
private static final String SERVER_ERROR = "An error occurred while "
+ "attempting to contact the server. Please check your network "
+ "connection and try again.";
/**
* Create a remote service proxy to talk to the server-side Greeting service.
*/
private final MailClientAsync sendMessage = GWT
.create(MailClient.class);
// ...
public void onModuleLoad()
{
java.lang.System.out.println("I finally worked!");
final Button sendButton;
final TextBox toField, fromField, subjectField, messageField;
final Label errorLabel = new Label();
sendButton = new Button("Send");
toField = new TextBox();
fromField = new TextBox();
subjectField = new TextBox();
messageField = new TextBox();
sendButton.addStyleName("sendButton");
toField.addStyleName("input");
fromField.addStyleName("input");
subjectField.addStyleName("input");
messageField.addStyleName("textarea");
//toField.setText("Testing123");
// Add the nameField and sendButton to the RootPanel
// Use RootPanel.get() to get the entire body element
RootPanel.get("sendButton").add(sendButton);
RootPanel.get("To").add(toField);
RootPanel.get("From").add(fromField);
RootPanel.get("Subject").add(subjectField);
RootPanel.get("Message").add(messageField);
RootPanel.get("errorLabelContainer").add(errorLabel);
// Focus the cursor on the to field when the app loads
toField.setFocus(true);
toField.selectAll();
//sendButton.setEnabled(true);
// Create the popup dialog box
final DialogBox dialogBox = new DialogBox();
dialogBox.setText("Message Sent");
dialogBox.setAnimationEnabled(true);
final Button closeButton = new Button("Close");
// We can set the id of a widget by accessing its Element
closeButton.getElement().setId("closeButton");
final Label textToServerLabel = new Label();
final HTML serverResponseLabel = new HTML();
VerticalPanel dialogVPanel = new VerticalPanel();
dialogVPanel.addStyleName("dialogVPanel");
dialogVPanel.add(new HTML("<b>Message Sent:</b>"));
dialogVPanel.add(textToServerLabel);
dialogVPanel.add(new HTML("<br><b>Server replies:</b>"));
dialogVPanel.add(serverResponseLabel);
dialogVPanel.setHorizontalAlignment(VerticalPanel.ALIGN_RIGHT);
dialogVPanel.add(closeButton);
dialogBox.setWidget(dialogVPanel);
// Add a handler to close the DialogBox
closeButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
dialogBox.hide();
sendButton.setEnabled(true);
sendButton.setFocus(true);
}
});
// Create a handler for the sendButton and nameField
class MyHandler implements ClickHandler, KeyUpHandler{
/**
* Fired when the user clicks on the sendButton.
*/
public void onClick(ClickEvent event) {
java.lang.System.out.println("I have been clicked");
sendMessageToServer();
}
/**
* Fired when the user types in the nameField.
*/
public void onKeyUp(KeyUpEvent event) {
if (event.getNativeKeyCode() == KeyCodes.KEY_ENTER) {
sendMessageToServer();
}
}
public void sendMessageToServer()
{
errorLabel.setText("");
String to = toField.getText();
String from = fromField.getText();
String subject = subjectField.getText();
String message = messageField.getText();
if (!FieldVerifier.isValidName(to, from, subject, message)) {
errorLabel.setText("Please enter at least four characters");
return;
}
sendButton.setEnabled(false);
textToServerLabel.setText("Hello");
serverResponseLabel.setText("");
sendMessage.sendMessage(to, from, subject, message, new AsyncCallback<String>() {
public void onFailure(Throwable caught) {
// Show the RPC error message to the user
dialogBox
.setText("Message sending Failed");
serverResponseLabel
.addStyleName("serverResponseLabelError");
serverResponseLabel.setHTML(SERVER_ERROR);
dialogBox.center();
closeButton.setFocus(true);
}
public void onSuccess(String result) {
dialogBox.setText("Message Sent");
serverResponseLabel
.removeStyleName("serverResponseLabelError");
serverResponseLabel.setHTML(result);
dialogBox.center();
closeButton.setFocus(true);
}
});
}
}
// Add a handler to send the name to the server
MyHandler handler = new MyHandler();
sendButton.addClickHandler(handler);
toField.addKeyUpHandler(handler);
fromField.addKeyUpHandler(handler);
subjectField.addKeyUpHandler(handler);
messageField.addKeyUpHandler(handler);
}
}
控制台：
2011-12-10 16:23:49.985 java[1379:407] [Java CocoaComponent compatibility mode]: Enabled
2011-12-10 16:23:49.986 java[1379:407] [Java CocoaComponent compatibility mode]: Setting timeout for SWT to 0.100000
Initializing App Engine server
Dec 10, 2011 4:23:52 PM com.google.apphosting.utils.jetty.JettyLogger info
INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
Dec 10, 2011 4:23:52 PM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml
INFO: Successfully processed /Users/umajosiah/Programming/Java/eclipse/workspace/ukstudentfeedback/war/WEB-INF/appengine-web.xml
Dec 10, 2011 4:23:52 PM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
INFO: Successfully processed /Users/umajosiah/Programming/Java/eclipse/workspace/ukstudentfeedback/war/WEB-INF/web.xml
Dec 10, 2011 4:23:53 PM com.google.appengine.tools.development.DevAppServerImpl start
INFO: The server is running at http://localhost:8888/
Dec 10, 2011 4:23:58 PM com.google.appengine.tools.development.LocalResourceFileServlet doGet
WARNING: No file found for: /images/stripe.png
Dec 10, 2011 4:24:03 PM com.google.appengine.tools.development.LocalResourceFileServlet doGet
WARNING: No file found for: /favicon.ico
我被点击了
答案 0 :(得分：1)
当我遇到无声电子邮件失败问题时，原因是我为发件人使用的地址不是为我的应用程序注册的管理员。您只能从您应用的管理员或arbitrary@yourappid.appspotmail.com发送电子邮件，或者，如果用户使用其Google帐户登录了其Google帐户地址，则只能发送电子邮件。
http://code.google.com/appengine/docs/java/mail/usingjavamail.html#Senders_and_Recipients