用Javamail写的邮件接收程序

import java.io.*;
import java.text.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class PraseMimeMessage{
 private MimeMessage mimeMessage = null;
 private String saveAttachPath = "";          //附件下载后的存放目录
 private StringBuffer bodytext = new StringBuffer();
 //存放邮件内容的StringBuffer对象
 private String dateformat = "yy-MM-dd HH:mm";    //默认的日前显示格式
    
/**
 * 构造函数,初始化一个MimeMessage对象
 */
 public PraseMimeMessage(){}
 public PraseMimeMessage(MimeMessage mimeMessage){
  this.mimeMessage = mimeMessage;
  System.out.println("create a PraseMimeMessage object........");
 }

 public void setMimeMessage(MimeMessage mimeMessage){
  this.mimeMessage = mimeMessage;
 }
  
/**
 * 获得发件人的地址和姓名
 */
 public String getFrom()throws Exception{
  InternetAddress address[] = (InternetAddress[])mimeMessage.getFrom();
  String from = address[0].getAddress();
  if(from == null) from="";
   String personal = address[0].getPersonal();
   if(personal == null) personal="";
    String fromaddr = personal+"<"+from+">";
    return fromaddr;
 }
/**
 * 获得邮件的收件人,抄送,和密送的地址和姓名,根据所传递的参数的不同
 * "to"----收件人 "cc"---抄送人地址 "bcc"---密送人地址
 */

 public String getMailAddress(String type)throws Exception{
  String mailaddr = "";
  String addtype = type.toUpperCase();
  InternetAddress []address = null;
  if(addtype.equals("TO") || addtype.equals("CC") ||addtype.equals("BCC")){
   if(addtype.equals("TO")){
    address = (InternetAddress[])mimeMessage.getRecipients(Message.RecipientType.TO);
   }else if(addtype.equals("CC")){
    address = (InternetAddress[])mimeMessage.getRecipients(Message.RecipientType.CC);
   }else{
    address = (InternetAddress[])mimeMessage.getRecipients(Message.RecipientType.BCC);
   }
   if(address != null){
    for(int i=0;i<address.length;i++){
     String email=address[i].getAddress();
     if(email==null) email="";
     else{
      email=MimeUtility.decodeText(email);
     }
     String personal=address[i].getPersonal();
      if(personal==null) personal="";
      else{
       personal=MimeUtility.decodeText(personal);
      }
      String compositeto=personal+"<"+email+">";
      mailaddr+=","+compositeto;
     }
     mailaddr=mailaddr.substring(1);
    }
   }else{
   throw new Exception("Error emailaddr type!");
   }
   return mailaddr;
  }
    
 /**
  * 获得邮件主题
  */

  public String getSubject()throws MessagingException{
   String subject = "";
   try{
    subject = MimeUtility.decodeText(mimeMessage.getSubject());
    if(subject == null) subject="";
   }catch(Exception exce){
   }
   return subject;
  }
    
 /**
  * 获得邮件发送日期
  */

  public String getSentDate()throws Exception{
    Date sentdate = mimeMessage.getSentDate();
    SimpleDateFormat format = new SimpleDateFormat(dateformat);
    return format.format(sentdate);
  }
    
 /**
  * 获得邮件正文内容
  */

  public String getBodyText(){
   return bodytext.toString();
  }
    
 /**
  * 解析邮件,把得到的邮件内容保存到一个StringBuffer对象中,解析邮件
  * 主要是根据MimeType类型的不同执行不同的操作,一步一步的解析
  */

  public void getMailContent(Part part)throws Exception{
    String contenttype = part.getContentType();
    int nameindex = contenttype.indexOf("name");
    boolean conname =false;
    if(nameindex != -1) conname=true;
     System.out.println("CONTENTTYPE: "+contenttype);
     if(part.isMimeType("text/plain") && !conname){
      bodytext.append((String)part.getContent());
     }else if(part.isMimeType("text/html") && !conname){
      bodytext.append((String)part.getContent());
     }else if(part.isMimeType("multipart/*")){
      Multipart multipart = (Multipart)part.getContent();
      int counts = multipart.getCount();
      for(int i=0;i<counts;i++){
        getMailContent(multipart.getBodyPart(i));
      }
     }else if(part.isMimeType("message/rfc822")){
      getMailContent((Part)part.getContent());
     }else{}
    }

 /**
  * 判断此邮件是否需要回执,如果需要回执返回"true",否则返回"false"
  */
  public boolean getReplySign()throws MessagingException{
    boolean replysign = false;
    String needreply[] = mimeMessage.getHeader("Disposition-Notification-To");
    if(needreply != null){
     replysign = true;
    }
    return replysign;
  }
    
 /**
  * 获得此邮件的Message-ID
  */
  public String getMessageId()throws MessagingException{
   return mimeMessage.getMessageID();
  }
    
 /**
  * 【判断此邮件是否已读,如果未读返回返回false,反之返回true】
  */
  public boolean isNew()throws MessagingException{
   boolean isnew = false;
   Flags flags = ((Message)mimeMessage).getFlags();
   Flags.Flag []flag = flags.getSystemFlags();
   System.out.println("flags's length: "+flag.length);
   for(int i=0;i<flag.length;i++){
    if(flag[i] == Flags.Flag.SEEN){
     isnew=true;
     System.out.println("seen Message.......");
     break;
   }
  }
  return isnew;
 }
 
/**
 * 判断此邮件是否包含附件
 */
 public boolean isContainAttach(Part part)throws Exception{
  boolean attachflag = false;
  String contentType = part.getContentType();
  if(part.isMimeType("multipart/*")){
   Multipart mp = (Multipart)part.getContent();
   for(int i=0;i<mp.getCount();i++){
    BodyPart mpart = mp.getBodyPart(i);
    String disposition = mpart.getDisposition();
    if((disposition != null) &&((disposition.equals(Part.ATTACHMENT)) ||(disposition.equals(Part.INLINE))))
     attachflag = true;
    else if(mpart.isMimeType("multipart/*")){
     attachflag = isContainAttach((Part)mpart);
    }else{
     String contype = mpart.getContentType();
     if(contype.toLowerCase().indexOf("application") != -1) attachflag=true;
     if(contype.toLowerCase().indexOf("name") != -1) attachflag=true;
    }
   }
  }else if(part.isMimeType("message/rfc822")){
   attachflag = isContainAttach((Part)part.getContent());
  }
  return attachflag;
 }
   
/**
 * 【保存附件】
 */

 public void saveAttachMent(Part part)throws Exception{
  String fileName = "";
  if(part.isMimeType("multipart/*")){
   Multipart mp = (Multipart)part.getContent();
   for(int i=0;i<mp.getCount();i++){
    BodyPart mpart = mp.getBodyPart(i);
    String disposition = mpart.getDisposition();
    if((disposition != null) &&((disposition.equals(Part.ATTACHMENT)) ||(disposition.equals(Part.INLINE)))){
     fileName = mpart.getFileName();
     if(fileName.toLowerCase().indexOf("gb2312") != -1){
       fileName = MimeUtility.decodeText(fileName);
     }
                                         saveFile(fileName,mpart.getInputStream());
 }else if(mpart.isMimeType("multipart/*")){
 saveAttachMent(mpart);
 }else{
  fileName = mpart.getFileName();
  if((fileName != null) && (fileName.toLowerCase().indexOf("GB2312") != -1)){
    fileName=MimeUtility.decodeText(fileName);
    saveFile(fileName,mpart.getInputStream());
  }
 }
}
}else if(part.isMimeType("message/rfc822")){
  saveAttachMent((Part)part.getContent());
}
}
    
/**
 * 【设置附件存放路径】
 */

 public void setAttachPath(String attachpath){
  this.saveAttachPath = attachpath;
 }
    
/**
 * 【设置日期显示格式】
 */

 public void setDateFormat(String format)throws Exception{
   this.dateformat = format;
 }
    
/**
 * 【获得附件存放路径】
 */

 public String getAttachPath(){
   return saveAttachPath;
 }
    
/**
 * 【真正的保存附件到指定目录里】
 */

 private void saveFile(String fileName,InputStream in)throws Exception{
  String osName = System.getProperty("os.name");
  String storedir = getAttachPath();
  String separator = "";
  if(osName == null) osName="";
  if(osName.toLowerCase().indexOf("win") != -1){
    separator = "//"
  if(storedir == null || storedir.equals("")) storedir="c://tmp";
  }else{
   separator = "/";
   storedir = "/tmp";
  }
  File storefile = new File(storedir+separator+fileName);
  System.out.println("storefile's path: "+storefile.toString());
 //for(int i=0;storefile.exists();i++){
 //storefile = new File(storedir+separator+fileName+i);
 //}
 BufferedOutputStream bos = null;
 BufferedInputStream  bis = null;
 try{
  bos = new BufferedOutputStream(new FileOutputStream(storefile));
  bis = new BufferedInputStream(in);
  int c;
  while((c=bis.read()) != -1){
    bos.write(c);
    bos.flush();
  }
 }catch(Exception exception){
   exception.printStackTrace();
   throw new Exception("文件保存失败!");
 }finally{
   bos.close();
   bis.close();
 }
}
   
/**
 * PraseMimeMessage类测试
 */

 public static void main(String args[])throws Exception{
  String host = "主机名/ip";     //【pop.mail.yahoo.com.cn】
  String username ="用户名";     //【wwp_1124】
  String password ="密码";       //【........】
  Properties props = new Properties();
  Session session = Session.getDefaultInstance(props, null);
  Store store = session.getStore("pop3");
  store.connect(host, username, password);
  Folder folder = store.getFolder("INBOX");
  folder.open(Folder.READ_ONLY);
  Message message[] = folder.getMessages();
  System.out.println("Messages's length: "+message.length);
  PraseMimeMessage pmm = null;
  for(int i=0;i<message.length;i++){
   pmm = new PraseMimeMessage((MimeMessage)message[i]);
   System.out.println("Message "+i+" subject: "+pmm.getSubject());
   System.out.println("Message "+i+" sentdate: "+pmm.getSentDate());
   System.out.println("Message "+i+" replysign: "+pmm.getReplySign());
   System.out.println("Message "+i+" hasRead: "+pmm.isNew());
   System.out.println("Message "+i+"  containAttachment: "+pmm.isContainAttach((Part)message[i]));
   System.out.println("Message "+i+" form: "+pmm.getFrom());
   System.out.println("Message "+i+" to: "+pmm.getMailAddress("to"));
   System.out.println("Message "+i+" cc: "+pmm.getMailAddress("cc"));
   System.out.println("Message "+i+" bcc: "+pmm.getMailAddress("bcc"));
   pmm.setDateFormat("yy年MM月dd日 HH:mm");
   System.out.println("Message "+i+" sentdate: "+pmm.getSentDate());
   System.out.println("Message "+i+" Message-ID: "+pmm.getMessageId());
   pmm.getMailContent((Part)message[i]);
   System.out.println("Message "+i+" bodycontent: /r/n"+pmm.getBodyText());
   pmm.setAttachPath("c://tmp//coffeecat1124");
   pmm.saveAttachMent((Part)message[i]);
  }
 }
} 

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