java - Swing 电子邮件客户端抛出 javax.mail.AuthenticationFailedException

Question

我正在尝试在 NetBeans 中创建电子邮件客户端来发送电子邮件，但我的代码中收到 AuthenticationFailedException 。这是我的代码(共有三个类):

EmailClient.java

package sendemail;

    public class EmailClient extends javax.swing.JFrame {

        SendMail sm=new SendMail();
        Settings set=new Settings();
        public EmailClient() {
            initComponents();
        }


        @SuppressWarnings("unchecked")
        +Generated code                     

        private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
           // TODO add your handling code here:
            sm.setVisible(true);
        }                                        

        private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            // TODO add your handling code here:
        }                                        

        private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            // TODO add your handling code here:
        }                                        

        private void jMenuItem2ActionPerformed(java.awt.event.ActionEvent evt) {                                           
            // TODO add your handling code here:
            set.setVisible(true);
        }                                          

        public static void main(String args[]) {
            /* Create and display the form */
            java.awt.EventQueue.invokeLater(new Runnable() {
                @Override
                public void run() {
                    new EmailClient().setVisible(true);
                }
            });
        }

        // Variables declaration - do not modify                     
        private javax.swing.JButton jButton1;
        private javax.swing.JButton jButton2;
        private javax.swing.JButton jButton3;
        private javax.swing.JLabel jLabel1;
        private javax.swing.JLabel jLabel2;
        private javax.swing.JLabel jLabel3;
        private javax.swing.JLabel jLabel4;
        private javax.swing.JLabel jLabel5;
        private javax.swing.JLabel jLabel6;
        private javax.swing.JMenu jMenu4;
        private javax.swing.JMenu jMenu5;
        private javax.swing.JMenuBar jMenuBar2;
        private javax.swing.JMenuItem jMenuItem2;
        private javax.swing.JPanel jPanel1;
        private javax.swing.JPanel jPanel3;
        private javax.swing.JPanel jPanel4;
        private javax.swing.JScrollPane jScrollPane1;
        private javax.swing.JTextArea jTextArea1;
        // End of variables declaration                   
    }

Settings.java

package sendemail;
    import javax.swing.*;
    import java.awt.*;

    public class Settings extends javax.swing.JFrame {

        public String uname;
        public String pass;
        public String smtpserver;
        public String  port;
        /**
         * Creates new form Settings
         */
        public Settings() {
            initComponents();
        }

        public String getUname() {
            return uname;
        }

        public String getPass() {
            return pass;
        }

        public String getSmtpserver() {
            return smtpserver;
        }

        public String getPort() {
            return port;
        }



        @SuppressWarnings("unchecked")
        +Generated Code                   

        private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            // TODO add your handling code here:
           uname=jTextField1.getText().toString();
            pass=jPasswordField1.getPassword().toString();

            smtpserver=jComboBox1.getSelectedItem().toString();
            port=jComboBox2.getSelectedItem().toString();

            if(uname.equals("") || pass.equals("") || smtpserver.equals("") || port.equals("") )
        {
                JOptionPane.showMessageDialog(this,"All Fields are mandatory");
        }                                        
        else
            {
                setVisible(false);
            }

        }                                        

        private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {                                           
            // TODO add your handling code here:
        }                                          

        public static void main(String args[]) {
            /* Create and display the form */
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new Settings().setVisible(false);
                }
            });
        }

        // Variables declaration - do not modify                     
        private javax.swing.JButton jButton1;
        private javax.swing.JComboBox jComboBox1;
        private javax.swing.JComboBox jComboBox2;
        private javax.swing.JLabel jLabel1;
        private javax.swing.JLabel jLabel2;
        private javax.swing.JLabel jLabel3;
        private javax.swing.JLabel jLabel4;
        private javax.swing.JPanel jPanel1;
        private javax.swing.JPasswordField jPasswordField1;
        private javax.swing.JTextField jTextField1;
        // End of variables declaration                   

    }

SendMail.Java

package sendemail;

    import java.util.Properties;
    import javax.mail.Message;
    import javax.mail.Session;
    import javax.mail.Transport;
    import javax.mail.internet.InternetAddress;
    import javax.mail.internet.MimeMessage;
    import javax.swing.JOptionPane;
    import java.awt.*;
    import javax.mail.*;
    import javax.mail.MessagingException;


    public class SendMail extends javax.swing.JFrame {

        Settings setfrm=new Settings();
        String subject;
        String from;

        public SendMail() {
            initComponents();
        }


        @SuppressWarnings("unchecked")
        +Generated Code                    

        private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            // TODO add your handling code here:
            try
            {
            final String user=setfrm.getUname();
            final String password=setfrm.getPass();
            String portnum=setfrm.getPort();
            String smtpname=setfrm.getSmtpserver();
            String to=jTextField1.getText();
            subject=jTextField2.getText();
            Properties properties=new Properties();
            properties.put("mail.smtp.host",smtpname.toString());
            properties.put("mail.smtp.socketFactory.port",portnum.toString());
            properties.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
            properties.put("mail.smtp.port",portnum.toString());
            properties.put("mail.smtp.auth","true");
            Session session=Session.getDefaultInstance(properties,
               new javax.mail.Authenticator() {
                   protected PasswordAuthentication getPasswordAuthentication(){
                    return new PasswordAuthentication(user,password);

               }

               }

               );
            MimeMessage message=new MimeMessage(session);
            message.setFrom(new InternetAddress(user));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(jTextField1.getText().toString()));
            message.setSubject(subject);
            message.setText(jTextArea1.getText());
            Transport.send(message);
            JOptionPane.showMessageDialog(null,"message sent");
            }
            catch(MessagingException mex)
            {
                JOptionPane.showMessageDialog(null,mex);
            }
        }                                        

        private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            // TODO add your handling code here:
        }                                        

        private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {                                            
            // TODO add your handling code here:
        }                                           

        public static void main(String args[]) {
            /* Create and display the form */
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new SendMail().setVisible(true);
                }
            });
        }

        // Variables declaration - do not modify                     
        private javax.swing.JButton jButton1;
        private javax.swing.JButton jButton2;
        private javax.swing.JLabel jLabel1;
        private javax.swing.JLabel jLabel2;
        private javax.swing.JPanel jPanel1;
        private javax.swing.JScrollPane jScrollPane1;
        private javax.swing.JTextArea jTextArea1;
        private javax.swing.JTextField jTextField1;
        private javax.swing.JTextField jTextField2;
        // End of variables declaration                   

    }

异常堆栈跟踪

javax.mail.AuthenticationFailedException
    at javax.mail.Service.connect(Service.java:306)
    at javax.mail.Service.connect(Service.java:156)
    at javax.mail.Service.connect(Service.java:105)
    at com.sun.mail.smtp.SMTPTransport.connect(SMTPTransport.java:93)
    at javax.mail.Transport.send0(Transport.java:168)
    at javax.mail.Transport.send(Transport.java:98)
    at sendemail.SendMail.jButton1ActionPerformed(SendMail.java:189)
    at sendemail.SendMail.access$100(SendMail.java:25)
    at sendemail.SendMail$2.actionPerformed(SendMail.java:77)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.java:6505)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3311)
    at java.awt.Component.processEvent(Component.java:6270)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4861)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2719)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:708)
    at java.awt.EventQueue$4.run(EventQueue.java:706)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
BUILD SUCCESSFUL (total time: 2 minutes 46 seconds)

我尝试使用 SendMail 类发送电子邮件，而发件人的电子邮件和密码是从 Settings 输入的，而 EmailClient 仅用于在单击按钮时将 JFrames 可见性设置为 true 或 false。

SMTP server:smtp.gmail.com
port:465

我认为问题出在SendMail类中Authenticator的变量上，但我不确定问题到底是什么。

Answer 1

I think the problem lies in the variables of Authenticator in SendMail.java....bu i don't know what the problem actually is......

您的问题在这里:

pass = jPasswordField1.getPassword().toString();

这不会转换 getPassword() 检索到的字符数组方法按照您想要的方式进行，因为它在数组上调用 toString() 方法。您应该用这一行替换该行:

pass = String.valueOf(jPasswordField1.getPassword());

另请注意，不鼓励使用 Session.getDefaultInstance() 方法。强烈建议使用 Session.getInstance() 方法，因为:

The Session.getDefaultInstance method creates a new Session the first time it's called, using the Properties that are passed. Subsequent calls will return that original Session and ignore any Properties you pass in. If you want to create different Sessions with different properties, Session.getDefaultInstance won't do that. [...] Always use Session.getInstance to avoid this problem.

JavaMail API FAQ中有很好的解释。您还可以看到此问答 hotmail login error in java (IDE: Netbeans) 中举例说明的使用 Session.getDefaultInstance() 的后果。

<小时/>

离题

也不鼓励使用多个 JFrame。请参阅此主题:The Use of Multiple JFrames, Good/Bad Practice?