sendmail.java

用java实现的对电子邮件进行加密解密及签名的算法接口

package cn.edu.scut.smimeapi;
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.mail.Authenticator;
import javax.mail.PasswordAuthentication;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.internet.MimeBodyPart;
import javax.mail.Multipart;
import javax.mail.internet.MimeMultipart;
import java.io.File;
import sun.misc.BASE64Encoder;

/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
class SmtpAuth extends Authenticator
{
 private String user, password;

 /**
  * to set the smtp auth's username and passwored
  * @param getuser String
  * @param getpassword String
  */
 public void setUserinfo(String getuser, String getpassword)
 {
  user = getuser;
  password = getpassword;
 }

 protected PasswordAuthentication getPasswordAuthentication()
 {
  return new PasswordAuthentication(user, password);
 }

}

public class SendMail {
   protected String host="";                       //smtp host
   protected String port="25";                     //smtp host port DEfault port:25
   protected String name="";                       //smtp auth username
   protected String password="";                   //smtp auth  password
   protected static Session session=null;

   //设置SMTP服务器、端口、验证用户名和密码
   /**
  * @param host String
  * @param port String
  * @param name String
  * @param password String
  */

   public void setAccount(String host,String port,String name,String password)
   {  this.host=host;
      this.port=port;
      this.name=name;
      this.password=password;
   }
  public void setAccount(String host,String name,String password)
  {  this.host=host;
    this.port="25";
    this.name=name;
    this.password=password;
}

  //创建一个普通文本邮件，返回邮件实例对象MimeMessage
  /**
  * @param from String
  * @param to String
  * @param subject String
  * @param content String
  * @return body MimeMessage
  */

  public MimeMessage CreateMail(String from,String to,String subject,String content)
  throws Exception
  {


              Properties props = System.getProperties();
              SmtpAuth sa = new SmtpAuth();
              props.put("mail.smtp.auth", "true");
              props.put("mail.smtp.host", host);
              props.put("mail.smtp.port", port);
              sa.setUserinfo(name, password);

              session = Session.getInstance(props, sa);
              session.setDebug(true);

              MimeMessage body = new MimeMessage(session);
              body.setFrom(new InternetAddress(from));
              body.setRecipient(Message.RecipientType.TO,  new InternetAddress(to));
              body.setSubject(subject);
              //body.setContent(content, "text/plain");
              body.setText(content);
              body.saveChanges();
              //Transport.send(body);

              return body;
 }

 //创建一个包含附件的邮件，返回邮件实例对象MimeMessage
 /**
 * @param from String
 * @param to String
 * @param subject String
 * @param content String
 * @param attachment String  the attchment's filepath
 * @return body MimeMessage
 */

 public MimeMessage CreateMailWithAttchment(String from,String to,String subject,String content,String attachment)
     throws Exception
 {
      if(attachment.equals(""))
      return CreateMail(from,to,subject,content);

      File file = new File(attachment);
         if (!file.isFile())
         {
           System.err.println("无效的附件名！");
          return CreateMail(from,to,subject,content);
         }
        Properties props = System.getProperties();
        SmtpAuth sa = new SmtpAuth();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.port", port);
        sa.setUserinfo(name, password);

         session = Session.getInstance(props, sa);
         session.setDebug(true);

        MimeMessage body = new MimeMessage(session);
        body.setFrom(new InternetAddress(from));
        body.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
        body.setSubject(subject);

        // create and fill the first message part
        MimeBodyPart mbp1 = new MimeBodyPart();
        mbp1.setText(content);

       // create the second message part-+
        MimeBodyPart mbp2 = new MimeBodyPart();

        // attach the file to the message

        FileDataSource fds = new FileDataSource(file);
        mbp2.setDataHandler(new DataHandler(fds));
        BASE64Encoder enc = new BASE64Encoder();//该类位于jre/lib/rt.jar中
         //fds为FileDataSource实例
        mbp2.setFileName("=?GBK?B?"+enc.encode((fds.getName()).getBytes())+"?=");
        //解决中文附件名乱码的问题

        //mbp2.setFileName(fds.getName());

       // create the Multipart and its parts to it
        Multipart mp = new MimeMultipart();
        mp.addBodyPart(mbp1);
        mp.addBodyPart(mbp2);

       // add the Multipart to the message
        body.setContent(mp,mp.getContentType());

        body.saveChanges();
        //Transport.send(body);
        return body;

}

public Session GetSession()
{
     return this.session;
}

//发送邮件
public void Send (MimeMessage msg)throws Exception
   {
      try
      {
             Transport.send(msg);
             System.out.println("邮件成功发送........");
      }
     catch (Exception ex)
       {
          throw new Exception(ex);

       }
   }

/*
  public static void main(String args[])
   {
     try{
     SendMail sm=new SendMail();
     sm.setAccount("202.38.212.1","yhliu","yhliu");
     String afile="E:\\附件中文问题.zip";
     // sm.Send(sm.CreateMail("[e-mail]","[e-mail]","test send mail中文问题","hello,world!中文问题啊"));
     sm.Send(sm.CreateMailWithAttchment("[e-mail]","[e-mail]","test send mail主题中文问题","hello,world!正文中文问题啊",afile));

        }
     catch (Exception ex)
     {
       ex.printStackTrace(System.err);
     }
   }
*/

}