receivemailapplet.java

Java网络编程实例第7章实例.rar

package mailapplet;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
import java.io.*;
import java.util.*;
import javax.swing.*;

public class receiveMailApplet extends Applet {
  private boolean isStandalone = false;
  private Label label1 = new Label();
  private TextField textField1 = new TextField();
  private Label label2 = new Label();
  private TextField textField2 = new TextField();
  private Label label3 = new Label();
  private TextField textField3 = new TextField();
  private TextArea textArea1 = new TextArea();
  private Button button1 = new Button();
  private Button button2 = new Button();
  public static String MAIL_STORE = "pop3";
  //Get a parameter value
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  //Construct the applet
  public receiveMailApplet() {
  }
  //Initialize the applet
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception {
    label1.setText("邮件服务器地址");
    label1.setBounds(new Rectangle(54, 25, 94, 27));
    this.setLayout(null);
    textField1.setBounds(new Rectangle(151, 25, 174, 28));
    label2.setText("用户名");
    label2.setBounds(new Rectangle(53, 61, 43, 26));
    textField2.setBounds(new Rectangle(151, 63, 174, 29));
    label3.setText("密码");
    label3.setBounds(new Rectangle(52, 102, 33, 25));
    textField3.setEchoChar('*');
    textField3.setBounds(new Rectangle(151, 101, 175, 29));
    textArea1.setEditable(false);
    textArea1.setBounds(new Rectangle(13, 184, 551, 365));
    button1.setLabel("登录");
    button1.setBounds(new Rectangle(143, 142, 77, 28));
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    button2.setLabel("重写");
    button2.setBounds(new Rectangle(237, 142, 77, 28));
    button2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button2_actionPerformed(e);
      }
    });
    this.add(label1, null);
    this.add(textField1, null);
    this.add(label2, null);
    this.add(textField2, null);
    this.add(label3, null);
    this.add(textField3, null);
    this.add(textArea1, null);
    this.add(button1, null);
    this.add(button2, null);
  }
  //Start the applet
  public void start() {
  }
  //Stop the applet
  public void stop() {
  }
  //Destroy the applet
  public void destroy() {
  }
  //Get Applet information
  public String getAppletInfo() {
    return "Applet Information";
  }
  //Get parameter info
  public String[][] getParameterInfo() {
    return null;
  }
  //Main method
  public static void main(String[] args) {
    receiveMailApplet applet = new receiveMailApplet();
    applet.isStandalone = true;
    Frame frame;
    frame = new Frame() {
      protected void processWindowEvent(WindowEvent e) {
        super.processWindowEvent(e);
        if (e.getID() == WindowEvent.WINDOW_CLOSING) {
          System.exit(0);
        }
      }
      public synchronized void setTitle(String title) {
        super.setTitle(title);
        enableEvents(AWTEvent.WINDOW_EVENT_MASK);
      }
    };
    frame.setTitle("Applet Frame");
    frame.add(applet, BorderLayout.CENTER);
    applet.init();
    applet.start();
    frame.setSize(500,620);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    frame.setLocation((d.width - frame.getSize().width) / 2, (d.height - frame.getSize().height) / 2);
    frame.setVisible(true);
  }

  void button2_actionPerformed(ActionEvent e) {
    textField1.setText("");
    textField2.setText("");
    textField3.setText("");
  }

  void button1_actionPerformed(ActionEvent e) {
    String mail_host = textField1.getText();
    String user = textField2.getText();
    String pass = textField3.getText();
    if ((user==null)||(user.trim().length()==0))
    {
      JOptionPane msg = new JOptionPane();
      JOptionPane.showMessageDialog(this, "用户名不能为空！", "用户名不能为空！", 0);
    }
    else if ((pass==null)||(pass.trim().length()==0))
    {
      JOptionPane msg = new JOptionPane();
      JOptionPane.showMessageDialog(this, "密码不能为空！", "密码不能为空！", 0);
    }
    else
    {
      try
      {
        Properties props = new Properties();
        props.put("mail.host",  mail_host);
        props.put("mail.transport.protocol",  "pop3");
        Session receiveMailSession;
        boolean  sessionDebug  =  false;
        receiveMailSession = Session.getDefaultInstance(props, null);
        receiveMailSession.setDebug(sessionDebug);
        URLName url = new URLName(MAIL_STORE, mail_host, -1, "INBOX", user, pass);
        Store store = receiveMailSession.getStore(url);
        store.connect();
        Folder inbox = store.getFolder("INBOX");
        inbox.open(Folder.READ_WRITE);
        int n = inbox.getMessageCount();
        Message[] msg = inbox.getMessages();
        for(int i=0;i<n;i++)
        {
          textArea1.append("Letter " + String.valueOf(i+1) + "\n");
          textArea1.append("Date: " + msg[i].getSentDate() + "\n");
          Address a[] = msg[i].getFrom();
          textArea1.append("From: " + a[0] + "\n");
          a = msg[i].getRecipients(Message.RecipientType.TO);
          textArea1.append("To: " + a[0] + "\n");
          String s = msg[i].getSubject();
          textArea1.append("Subject: " + s + "\n");
          Object o = msg[i].getContent();
          if (msg[i].isMimeType("text/plain"))
          {
            textArea1.append(o + "\n");
          }
          else if (msg[i].isMimeType("multipart/*"))
          {
            Multipart mp = (Multipart)o;
            for(int j=0;j<mp.getCount();j++)
            {
              Part part = mp.getBodyPart(j);
              String contentType = part.getContentType();
              if (contentType==null)
              {
                textArea1.append("Bad content type for part " + String.valueOf(j) + "\n");
                continue;
              }
              ContentType ct = new ContentType(contentType);
              if (j!=0)
              {
                textArea1.append("\n");
              }
              if (ct.match("text/plain"))
              {
                textArea1.append(part.getContent() + "\n");
              }
              else
              {
                String desc = "Attachment ";
                s = part.getFileName();
                if(s!=null)
                {
                  desc+= s;
                }
                textArea1.append(desc + "\n");
              }
            }
          }
        }
      }
      catch(Exception e1)
      {
        //out.println("Unable to connect to MailServer");
      }
    }
  }
}