java - 第二次身份验证失败 Java Mail API

Question

好吧，我将我的 gmail 地址和通行证放入 2 个 EditTexts 中，当我单击“确定”按钮时，我尝试使用 java mail api 在我的 gmail 帐户中发送邮件。但如果我输入了错误的数据，它不会进行身份验证，因此我不会发送电子邮件。如果我再次启动应用程序并使用真实数据，则它无法再次进行身份验证。我做错了什么还是java mail api 就是这样做的？这是我用来发送电子邮件的内容:

public GmailSender(String user, String password) {
    this.user = user;
    this.password = password;

    Properties props = new Properties();
    props.setProperty("mail.transport.protocol", "smtp");
    props.setProperty("mail.host", mailhost);
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.port", "465");
    props.put("mail.smtp.port", "587");
    props.put("mail.smtp.socketFactory.port", "465");
    props.put("mail.smtp.socketFactory.port", "587");
    props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.socketFactory.fallback", "false");
    props.setProperty("mail.smtp.quitwait", "false");

    session = Session.getDefaultInstance(props, this);

}

protected PasswordAuthentication getPasswordAuthentication() {

    return new PasswordAuthentication(user, password);
}
public synchronized void sendMail(String subject, String body, String sender, String recipients) throws Exception {

    MimeMessage message = new MimeMessage(session);
    DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), "text/plain"));
    message.setSender(new InternetAddress(sender));
    message.setSubject(subject);
    message.setDataHandler(handler);
    if (recipients.indexOf(',') > 0)
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
    else
        message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
    Transport.send(message);
}

public class ByteArrayDataSource implements DataSource {
    private byte[] data;
    private String type;

    public ByteArrayDataSource(byte[] data, String type)    {
        super();
        this.data = data;
        this.type = type;
                                                            }

    public ByteArrayDataSource(byte[] data) {
        super();
        this.data = data;
                                            }

    public void setType(String type)    {
        this.type = type;
                                        }

    public String getContentType() {
        if (type == null)
            return "application/octet-stream";
        else
            return type;
                                    }

    public InputStream getInputStream() throws IOException  {
        return new ByteArrayInputStream(data);
                                                            }

    public String getName() {
        return "ByteArrayDataSource";
                            }

    public OutputStream getOutputStream() throws IOException    {
        throw new IOException("Not Supported");
                                                                }

}

} 这是我从 logcat 得到的内容

12-07 09:58:50.781: E/Validate(595): println needs a message
12-07 09:58:50.781: E/Validate(595): java.lang.NullPointerException: println needs a     message
12-07 09:58:50.781: E/Validate(595):    at android.util.Log.println_native(Native Method)
12-07 09:58:50.781: E/Validate(595):    at android.util.Log.i(Log.java:143)
12-07 09:58:50.781: E/Validate(595):    at     stathis.example.teliko.Data.onClick(Data.java:107)
12-07 09:58:50.781: E/Validate(595):    at     android.view.View.performClick(View.java:2408)
12-07 09:58:50.781: E/Validate(595):    at android.view.View$PerformClick.run(View.java:8816)
12-07 09:58:50.781: E/Validate(595):    at android.os.Handler.handleCallback(Handler.java:587)
12-07 09:58:50.781: E/Validate(595):    at android.os.Handler.dispatchMessage(Handler.java:92)
12-07 09:58:50.781: E/Validate(595):    at android.os.Looper.loop(Looper.java:123)
12-07 09:58:50.781: E/Validate(595):    at android.app.ActivityThread.main(ActivityThread.java:4627)
12-07 09:58:50.781: E/Validate(595):    at java.lang.reflect.Method.invokeNative(Native Method)
12-07 09:58:50.781: E/Validate(595):    at java.lang.reflect.Method.invoke(Method.java:521)
12-07 09:58:50.781: E/Validate(595):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-07 09:58:50.781: E/Validate(595):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-07 09:58:50.781: E/Validate(595):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

我不知道这是否是你的问题，但以下代码是错误的:

Properties props = new Properties();
...
props.put("mail.smtp.port", "465");
props.put("mail.smtp.port", "587");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.port", "587");

Properties 对象是一种 Map，它从 String 映射到 Object。如果您连续两次使用相同的键调用 put 方法，则第二次调用中的值将替换您在第一次调用中添加的值。

所以上面相当于:

Properties props = new Properties();
...
props.put("mail.smtp.port", "587");
props.put("mail.smtp.socketFactory.port", "587");

您的“465”条目将被忽略。