java Mail邮件接收工具类

下面是一个邮件接收的工具类，有点长！！！

public class ReciveMail {
 private MimeMessage msg = null;
  private String saveAttchPath = "";
  private StringBuffer bodytext = new StringBuffer();
  private String dateformate = "yy-MM-dd HH:mm"; 

  public ReciveMail(MimeMessage msg){
    this.msg = msg;
    }
  public void setMsg(MimeMessage msg) {
    this.msg = msg;
  } 

  /**
   * 获取发送邮件者信息
   * @return
   * @throws MessagingException
   */
  public String getFrom() throws MessagingException{
    InternetAddress[] address = (InternetAddress[]) msg.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;
  } 

  /**
   * 获取邮件收件人，抄送，密送的地址和信息。根据所传递的参数不同 "to"-->收件人,"cc"-->抄送人地址,"bcc"-->密送地址
   * @param type
   * @return
   * @throws MessagingException
   * @throws UnsupportedEncodingException
   */
  public String getMailAddress(String type) throws MessagingException, UnsupportedEncodingException{
    String mailaddr = "";
    String addrType = type.toUpperCase();
    InternetAddress[] address = null; 

    if(addrType.equals("TO")||addrType.equals("CC")||addrType.equals("BCC")){
      if(addrType.equals("TO")){
        address = (InternetAddress[]) msg.getRecipients(Message.RecipientType.TO);
      }
      if(addrType.equals("CC")){
        address = (InternetAddress[]) msg.getRecipients(Message.RecipientType.CC);
      }
      if(addrType.equals("BCC")){
        address = (InternetAddress[]) msg.getRecipients(Message.RecipientType.BCC);
      }
      if(address != null){
        for(int i=0;i<address.length;i++){
          String mail = address[i].getAddress();
          if(mail == null){
            mail = "";
          }else{
            mail = MimeUtility.decodeText(mail);
          }
          String personal = address[i].getPersonal();
          if(personal == null){
            personal = "";
          }else{
            personal = MimeUtility.decodeText(personal);
          }
          String compositeto = personal +"<"+mail+">";
          mailaddr += ","+compositeto;
        }
        mailaddr = mailaddr.substring(1);
      }
    }else{
      throw new RuntimeException("Error email Type!");
    }
    return mailaddr;
  } 

  /**
   * 获取邮件主题
   * @return
   * @throws UnsupportedEncodingException
   * @throws MessagingException
   */
  public String getSubject() throws UnsupportedEncodingException, MessagingException{
    String subject = "";
    subject = MimeUtility.decodeText(msg.getSubject());
    if(subject == null){
      subject = "";
    }
    return subject;
  } 

  /**
   * 获取邮件发送日期
   * @return
   * @throws MessagingException
   */
  public String getSendDate() throws MessagingException{
    Date sendDate = msg.getSentDate();
    SimpleDateFormat smd = new SimpleDateFormat(dateformate);
    return smd.format(sendDate);
  } 

  /**
   * 获取邮件正文内容
   * @return
   */
  public String getBodyText(){
    return bodytext.toString();
  } 

  /**
   * 解析邮件，将得到的邮件内容保存到一个stringBuffer对象中，
   * 解析邮件 主要根据MimeType的不同执行不同的操作，一步一步的解析
   * @param part
   * @throws MessagingException
   * @throws IOException
   */
  public void getMailContent(Part part) throws MessagingException, IOException{ 

    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 count = multipart.getCount();
      for(int i=0;i<count;i++){
        getMailContent(multipart.getBodyPart(i));
      }
    }else if(part.isMimeType("message/rfc822")){
      getMailContent((Part) part.getContent());
    } 

  } 

  /**
   * 判断邮件是否需要回执，如需回执返回true，否则返回false
   * @return
   * @throws MessagingException
   */
  public boolean getReplySign() throws MessagingException{
    boolean replySign = false;
    String needreply[] = msg.getHeader("Disposition-Notification-TO");
    if(needreply != null){
      replySign = true;
    }
    return replySign;
  } 

  /**
   * 获取此邮件的message-id
   * @return
   * @throws MessagingException
   */
  public String getMessageId() throws MessagingException{
    return msg.getMessageID();
  } 

  /**
   * 判断此邮件是否已读，如果未读则返回false，已读返回true
   * @return
   * @throws MessagingException
   */
  public boolean isNew() throws MessagingException{
    boolean isnew = false;
    Flags flags = ((Message)msg).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;
  } 

  /**
   * 判断是是否包含附件
   * @param part
   * @return
   * @throws MessagingException
   * @throws IOException
   */
  public boolean isContainAttch(Part part) throws MessagingException, IOException{
    boolean flag = false; 

    //String contentType = part.getContentType();
    if(part.isMimeType("multipart/*")){
      Multipart multipart = (Multipart) part.getContent();
      int count = multipart.getCount();
      for(int i=0;i<count;i++){
        BodyPart bodypart = multipart.getBodyPart(i);
        String dispostion = bodypart.getDisposition();
        if((dispostion != null)&&(dispostion.equals(Part.ATTACHMENT)||dispostion.equals(Part.INLINE))){
          flag = true;
        }else if(bodypart.isMimeType("multipart/*")){
          flag = isContainAttch(bodypart);
        }else{
          String conType = bodypart.getContentType();
          if(conType.toLowerCase().indexOf("appliaction")!=-1){
            flag = true;
          }
          if(conType.toLowerCase().indexOf("name")!=-1){
            flag = true;
          }
        }
      }
    }else if(part.isMimeType("message/rfc822")){
      flag = isContainAttch((Part) part.getContent());
    } 

    return flag;
  } 

  /**
   * 保存附件
   * @param part
   * @throws MessagingException
   * @throws IOException
   */
  public void saveAttchMent(Part part) throws MessagingException, IOException{
    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 dispostion = mpart.getDisposition();
        if((dispostion != null)&&(dispostion.equals(Part.ATTACHMENT)||dispostion.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/*")){
          saveAttchMent(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")){
      saveAttchMent((Part) part.getContent());
    }
  }
  /**
   * 获得保存附件的地址
   * @return
   */
  public String getSaveAttchPath() {
    return saveAttchPath;
  }
  /**
   * 设置保存附件地址
   * @param saveAttchPath
   */
  public void setSaveAttchPath(String saveAttchPath) {
    this.saveAttchPath = saveAttchPath;
  }
  /**
   * 设置日期格式
   * @param dateformate
   */
  public void setDateformate(String dateformate) {
    this.dateformate = dateformate;
  }
  /**
   * 保存文件内容
   * @param filename
   * @param inputStream
   * @throws IOException
   */
  private void saveFile(String filename, InputStream inputStream) throws IOException {
    String osname = System.getProperty("os.name");
    String storedir = getSaveAttchPath();
    String sepatror = "";
    if(osname == null){
      osname = "";
    } 

    if(osname.toLowerCase().indexOf("win")!=-1){
      sepatror = "//";
      if(storedir==null||"".equals(storedir)){
        storedir = "d://temp";
      }
    }else{
      sepatror = "/";
      storedir = "/temp";
    } 

    File storefile = new File(storedir+sepatror+filename);
    System.out.println("storefile's path:"+storefile.toString()); 

    BufferedOutputStream bos = null;
    BufferedInputStream bis = null; 

    try {
      bos = new BufferedOutputStream(new FileOutputStream(storefile));
      bis = new BufferedInputStream(inputStream);
      int c;
      while((c= bis.read())!=-1){
        bos.write(c);
        bos.flush();
      }
    } catch (FileNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }finally{
      bos.close();
      bis.close();
    } 

  } 

  public void recive(Part part,int i) throws MessagingException, IOException{
    System.out.println("------------------START-----------------------");
    System.out.println("Message"+i+" subject:" + getSubject());
    System.out.println("Message"+i+" from:" + getFrom());
    System.out.println("Message"+i+" isNew:" + isNew());
    boolean flag = isContainAttch(part);
    System.out.println("Message"+i+" isContainAttch:" +flag);
    System.out.println("Message"+i+" replySign:" + getReplySign());
    getMailContent(part);
    System.out.println("Message"+i+" content:" + getBodyText());
    setSaveAttchPath("c://temp//"+i);
    if(flag){
      saveAttchMent(part);
    }
    System.out.println("------------------END-----------------------");
  }

}

邮件接收与工具类的使用，有好几种邮件接收的写法！：

看了很多网上其他代码，pop3Server的值是pop.mail.163.com，但是试了试不成功，还有 user的值既可以是带有 username@...com也可以是username。

如果收件邮箱是163邮箱，必须先登陆163邮箱中设置，开启pop3服务。至于别的邮箱暂不知道。

public static void main(String[] args) throws Exception {
    // 连接pop3服务器的主机名、协议、用户名、密码
    String pop3Server = "pop.163.com";
    String protocol = "pop3";
    String user = "username";
    String pwd = "password"; 

    // 创建一个有具体连接信息的Properties对象
    Properties props = new Properties();
    props.setProperty("mail.store.protocol", protocol);
    props.setProperty("mail.pop3.host", pop3Server); 

    // 使用Properties对象获得Session对象
    Session session = Session.getInstance(props);
    session.setDebug(true); 

    // 利用Session对象获得Store对象，并连接pop3服务器
    Store store = session.getStore();
    store.connect(pop3Server, user, pwd); 

    // 获得邮箱内的邮件夹Folder对象，以"只读"打开
    Folder folder = store.getFolder("inbox");
    folder.open(Folder.READ_ONLY); 

    // 获得邮件夹Folder内的所有邮件Message对象
    Message [] messages = folder.getMessages();
    ReciveMail rm = null;
    for(int i=0;i< messages.size() ;i++){
      rm = new ReciveMail((MimeMessage) messages[i]);
      rm.recive(messages[i],i);;
    }
     folder.close(false);
    store.close();
}