代码如下:想向www.126.com发送一个邮件,所以我nslookup获得服务器的地址
GUI填写的信息如下--刚开始了解这方面的东西所以有错误请指教。
SMTP Server:ns3.nease.netFrom:[email protected]
To:[email protected]:Test JavaMial
以及发送的一些内容。放松后提示一个错误
javax.mail.SendFailedException: Sending failed;
  nested exception is:
class javax.mail.MessagingException: Could not connect to SMTP host: ns.nease.net, port: 25, response: -1
at javax.mail.Transport.send0(Transport.java:218)
at javax.mail.Transport.send(Transport.java:80)
at ApplicationMial$1.run(ApplicationMial.java:183)
at java.lang.Thread.run(Thread.java:534)*/请高手指点Thank!
import javax.mail.*;import javax.mail.internet.*;import java.util.*;import javax.swing.*;import java.awt.event.*;import java.awt.*;public class ApplicationMial extends JFrame {  private JButton     sendButton   = new JButton("Send Message");   private JLabel      fromLabel    = new JLabel("From: ");   private JLabel      toLabel      = new JLabel("To: ");   private JLabel      hostLabel    = new JLabel("SMTP Server: ");   private JLabel      subjectLabel = new JLabel("Subject: ");   private JTextField  fromField    = new JTextField(40);   private JTextField  toField      = new JTextField(40);   private JTextField  hostField    = new JTextField(40);   private JTextField  subjectField = new JTextField(40);   private JTextArea   message      = new JTextArea(40, 72);   private JScrollPane jsp          = new JScrollPane(message);  public ApplicationMial( ) {        super("SMTP Client");    Container contentPane = this.getContentPane( );    contentPane.setLayout(new BorderLayout( ));          JPanel labels = new JPanel( );    labels.setLayout(new GridLayout(4, 1));    labels.add(hostLabel);        JPanel fields = new JPanel( );    fields.setLayout(new GridLayout(4, 1));    String host = System.getProperty("mail.host", "");    hostField.setText(host);    fields.add(hostField);        labels.add(toLabel);    fields.add(toField);    String from = System.getProperty("mail.from", "");    fromField.setText(from);    labels.add(fromLabel);    fields.add(fromField);    labels.add(subjectLabel);    fields.add(subjectField);        Box north = Box.createHorizontalBox( );    north.add(labels);    north.add(fields);        contentPane.add(north, BorderLayout.NORTH);        message.setFont(new Font("Monospaced", Font.PLAIN, 12));    contentPane.add(jsp, BorderLayout.CENTER);    JPanel south = new JPanel( );    south.setLayout(new FlowLayout(FlowLayout.CENTER));    south.add(sendButton);    sendButton.addActionListener(new SendAction( ));    contentPane.add(south, BorderLayout.SOUTH);               this.pack( );       }  class SendAction implements ActionListener {       public void actionPerformed(ActionEvent evt) {            try {        Properties props = new Properties( );        props.put("mail.host", hostField.getText( ));                 Session mailConnection = Session.getInstance(props, null);        final Message msg = new MimeMessage(mailConnection);          Address to = new InternetAddress(toField.getText( ));        Address from = new InternetAddress(fromField.getText( ));              msg.setContent(message.getText( ), "text/plain");        msg.setFrom(from);        msg.setRecipient(Message.RecipientType.TO, to);        msg.setSubject(subjectField.getText( ));                Runnable r = new Runnable( ) {          public void run( ) {            try {              Transport.send(msg);            }            catch (Exception ex) {              ex.printStackTrace( );             }          }         };        Thread t = new Thread(r);        t.start( );                message.setText("");      }      catch (Exception ex) {        ex.printStackTrace( );       }          }       }  public static void main(String[] args) {   ApplicationMial client = new ApplicationMial();    
client.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    client.show();
      }}