为什么我不能从servlet发送电子邮件？

Question

我正在尝试从servlet发送电子邮件。也不例外，但是我的帐户中没有收到电子邮件。我正在使用以下代码：

 public class SendEmailServlet extends HttpServlet {
@SuppressWarnings({ "unchecked" })
public void doPost(HttpServletRequest req, HttpServletResponse resp)
        throws IOException {
    resp.setContentType("text/plain");
    PrintWriter out = resp.getWriter();
    PersistenceManager pm = PMF.get().getPersistenceManager();
    try
    {
         String to[] = {"[e-mail]"};
            String host = "smtp.gmail.com";
            String username = "[e-mail]";
            String password = "password";
            Properties props = new Properties();
            props.put("mail.smtps.auth", "true");
            // ...
            Session session = Session.getInstance(props);
            MimeMessage msg = new MimeMessage(session);
            // set the message content here
            msg.setFrom(new InternetAddress(username,"Me"));
            msg.setSubject("Testing");
            msg.setText("Testing...");
            Address[] addresses = new Address[to.length];
            for (int i = 0; i < to.length; i++) {
                Address address = new InternetAddress(to[i]);               
                addresses[i] = address;
                // Add the given addresses to the specified recipient type.
                msg.addRecipient(Message.RecipientType.TO, new InternetAddress(to[i]));
            }

            Transport t = session.getTransport("smtps");

            t.connect(host, username, password);
            t.sendMessage(msg, msg.getAllRecipients());
            t.close();

            out.println(0);
        }
    }
    catch (Exception e)
    {
       System.out.println("Exception error: " + e);
       out.println(e);
    }
    finally
    {
        pm.close();
    }
}

}

我现在收到以下异常：

  Exception error: java.security.AccessControlException: access denied (java.net.SocketPermission smtp.gmail.com resolve)

谁能告诉我为什么我没有收到电子邮件以及此代码有什么问题。提前致谢

Answer 1

阅读https://developers.google.com/appengine/docs/java/mail/overview
基本上停止在您的应用程序中包含任何JavaMail库，并且不要尝试连接到主机。构建消息并直接跳转到Transport.send（msg）;