javamail实现邮件收发和加密

用java实现的对电子邮件进行加密解密及签名的算法接口，能够对发送的邮件进行加密和解密，并且能够发送和收取邮件。

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 

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

    ..A..H.     15872  2002-11-01 07:32  javaMail编程实例\mailapplet\Thumbs.db

     文件       2631  2002-10-27 20:32  javaMail编程实例\mailapplet\mailapplet.jpx

     文件       7023  2002-10-27 20:44  javaMail编程实例\mailapplet\src\mailapplet\receiveMailapplet.java

     文件       6255  2002-10-27 20:18  javaMail编程实例\mailapplet\src\mailapplet\sendMailapplet.java

     目录          0  2005-10-04 09:13  javaMail编程实例\mailapplet\src\mailapplet

     目录          0  2005-10-04 09:13  javaMail编程实例\mailapplet\src

     文件        450  2002-11-05 21:15  javaMail编程实例\mailapplet\classes\receiveMailapplet.html

     文件        450  2002-10-27 20:20  javaMail编程实例\mailapplet\classes\receiveMailapplet.html~1~

     文件        735  2002-11-01 05:40  javaMail编程实例\mailapplet\classes\mailapplet\receiveMailapplet$1.class

     文件        735  2002-11-01 05:40  javaMail编程实例\mailapplet\classes\mailapplet\receiveMailapplet$2.class

     文件        869  2002-11-01 05:40  javaMail编程实例\mailapplet\classes\mailapplet\receiveMailapplet$3.class

     文件       8237  2002-11-01 05:40  javaMail编程实例\mailapplet\classes\mailapplet\receiveMailapplet.class

     文件        717  2002-11-01 05:40  javaMail编程实例\mailapplet\classes\mailapplet\sendMailapplet$1.class

     文件        717  2002-11-01 05:40  javaMail编程实例\mailapplet\classes\mailapplet\sendMailapplet$2.class

     文件        860  2002-11-01 05:40  javaMail编程实例\mailapplet\classes\mailapplet\sendMailapplet$3.class

     文件       6757  2002-11-01 05:40  javaMail编程实例\mailapplet\classes\mailapplet\sendMailapplet.class

     目录          0  2005-10-04 09:13  javaMail编程实例\mailapplet\classes\mailapplet

     目录          0  2005-10-04 09:13  javaMail编程实例\mailapplet\classes

     目录          0  2005-10-04 09:13  javaMail编程实例\mailapplet

     文件       2588  2002-09-24 22:13  javaMail编程实例\receivemail\receivemail.jpx

     文件       3413  2002-10-23 22:22  javaMail编程实例\receivemail\src\receivemail\Receive.java

     目录          0  2005-10-04 09:13  javaMail编程实例\receivemail\src\receivemail

     目录          0  2005-10-04 09:13  javaMail编程实例\receivemail\src

     文件       3968  2002-10-10 10:23  javaMail编程实例\receivemail\classes\receivemail\Receive.class

     目录          0  2005-10-04 09:13  javaMail编程实例\receivemail\classes\receivemail

     目录          0  2005-10-04 09:13  javaMail编程实例\receivemail\classes

     目录          0  2005-10-04 09:13  javaMail编程实例\receivemail

     文件       2675  2002-10-09 21:00  javaMail编程实例\receivemail_authentic\receivemail_authentic.jpx

     文件       1856  2002-10-10 11:42  javaMail编程实例\receivemail_authentic\src\receivemail_authentic\MailAuthenticator.java

     文件       3148  2002-10-23 23:44  javaMail编程实例\receivemail_authentic\src\receivemail_authentic\Receive.java

............此处省略48个文件信息