sendmailapplet.java

Java网络编程实例 第10章实例.rar

package mailapplet;

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

public class sendMailApplet 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 Label label4 = new Label();
  private TextField textField4 = new TextField();
  private Label label5 = new Label();
  private TextArea textArea1 = new TextArea();
  private Button button1 = new Button();
  private Button button2 = new Button();
  //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 sendMailApplet() {
  }
  //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(32, 27, 87, 27));
    this.setLayout(null);
    textField1.setBounds(new Rectangle(122, 25, 162, 24));
    label2.setText("发件人地址");
    label2.setBounds(new Rectangle(31, 67, 88, 31));
    textField2.setBounds(new Rectangle(122, 68, 163, 25));
    label3.setText("收件人地址");
    label3.setBounds(new Rectangle(31, 108, 88, 31));
    textField3.setBounds(new Rectangle(123, 107, 163, 26));
    label4.setText("主题");
    label4.setBounds(new Rectangle(33, 152, 59, 30));
    textField4.setBounds(new Rectangle(123, 148, 162, 25));
    label5.setText("正文");
    label5.setBounds(new Rectangle(32, 254, 42, 27));
    textArea1.setBounds(new Rectangle(86, 194, 257, 187));
    button1.setLabel("发送");
    button1.setBounds(new Rectangle(102, 408, 76, 27));
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    button2.setLabel("重写");
    button2.setBounds(new Rectangle(192, 407, 80, 27));
    button2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button2_actionPerformed(e);
      }
    });
    this.add(textField1, null);
    this.add(label1, null);
    this.add(label2, null);
    this.add(textField2, null);
    this.add(textField3, null);
    this.add(label3, null);
    this.add(textField4, null);
    this.add(label4, null);
    this.add(label5, 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) {
    sendMailApplet applet = new sendMailApplet();
    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(400,320);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    frame.setLocation((d.width - frame.getSize().width) / 2, (d.height - frame.getSize().height) / 2);
    frame.setVisible(true);
  }

  void button1_actionPerformed(ActionEvent e) {
    String mail_host = textField1.getText();
    String from = textField2.getText();
    String to = textField3.getText();
    String subject = textField4.getText();
    String body = textArea1.getText();
    if ((from==null)||(from.trim().length()==0))       //若发件人输入框为空则提示错误
    {
      JOptionPane msg = new JOptionPane();
      JOptionPane.showMessageDialog(this, "发件人地址不能为空！", "地址不能为空！", 0);
    }
    else if ((to==null)||(to.trim().length()==0))      //若收件人输入框为空则提示错误
    {
      JOptionPane msg = new JOptionPane();
      JOptionPane.showMessageDialog(this, "收件人地址不能为空！", "地址不能为空！", 0);
    }
    else
    {
      try
      {
        Properties  props  = new Properties();
        props.put("mail.host",  mail_host);         //设置邮件服务器的名称
        props.put("mail.transport.protocol",  "smtp");  //设置邮件传输协议为pop3
        Session sendMailSession;
       boolean  sessionDebug  =  false;
        sendMailSession = Session.getDefaultInstance(props, null);  //产生一个发送邮件的Session实例
        sendMailSession.setDebug(sessionDebug);
        Message newMessage = new MimeMessage(sendMailSession);      //产生一个Message类的实例用来设置邮件内容
        newMessage.setFrom(new InternetAddress(from));              //设置发信人的地址
        InternetAddress[]  address  =  {new  InternetAddress(to)};
        newMessage.setRecipients(Message.RecipientType.TO,  address);  //设置收信人地址
        newMessage.setSubject(subject);                             //设置信件主题
        newMessage.setSentDate(new Date());                        //设置信件发送日期
        newMessage.setText(body);                                  //设置信件正文内容
        Transport.send(newMessage);                                //发送信件
        JOptionPane msg = new JOptionPane();
        JOptionPane.showMessageDialog(this, "发送邮件成功！", "发送邮件成功！", 1);
        textField1.setText("");
        textField2.setText("");
        textField3.setText("");
        textField4.setText("");
        textArea1.setText("");
      }
      catch(Exception e1)
      {
        JOptionPane msg = new JOptionPane();                     //捕捉异常情况
        JOptionPane.showMessageDialog(this, "不能发送邮件！", "不能发送邮件！", 2);
        e1.printStackTrace();
      }
    }
  }

  void button2_actionPerformed(ActionEvent e) {    //用户点击“重写”按钮产生的动作
    textField1.setText("");
    textField2.setText("");
    textField3.setText("");
    textField4.setText("");
    textArea1.setText("");
  }
}