谁能提供一个收取邮件的例子（要能解决乱码的！）

这段代码。。。我收取的时判断pmm.isNew()都是false,没有一个true的。
还有收取收取邮件会出现乱码。。。都不知道怎么解决。。。
[code="java"]
package com;
import java.io.*;

import java.text.*;

import java.util.*;

import javax.mail.*;

import javax.mail.internet.*;

import javax.servlet.http.HttpServletRequest;

import com.gdschina.ccu.util.UIDGenerator;

/**

有一封邮件就需要建立一个ReciveMail对象

*/

public class ReciveOneMail {

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

private String dateformat = "yy-MM-dd HH:mm"; //默认的日前显示格式
public ReciveOneMail(MimeMessage mimeMessage) {

this.mimeMessage = mimeMessage;

}
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(); //发件人的姓名 if (personal == null)
  personal = "";
  String fromaddr = personal + "<" + from + ">"; //发件人的地址 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(0);
  }
  } else {
  throw new Exception("Error emailaddr type!");
  }
  return mailaddr;
  }
/**
- 获得有中文字的参数, 转成 UTF-8 encoding, default 为 "" .
- @param request
- @param name
- 参数名.
- @return / public static String setDecodeText( String name) { String tmp = ""; try { tmp = new String( name.getBytes( "ISO-8859-1"), "UTF-8"); } catch (UnsupportedEncodingException e) { } return tmp; } /*
- 获得邮件主题
  
  */
  
  public String getSubject() throws MessagingException {
  
  String subject = "";
  
  try {
  
  subject = mimeMessage.getSubject();
  String header = ((MimeMessage)mimeMessage).getHeader("SUBJECT")[0];
  
  if ((header.toLowerCase().indexOf("=?"))>0)
  
  {
  
  subject = new String((subject.getBytes("iso-8859-1")),"gb2312");
  
  }
```
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);
  } /*
- 获取收件时间
- @return
- @throws Exception */ public String getReceivedDate() throws Exception{ Date receivedDate = mimeMessage.getReceivedDate(); SimpleDateFormat format = new SimpleDateFormat(dateformat); return format.format(receivedDate);
}
/**
- 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("gbk") != -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 = "D:\tmp";
  } else {
  separator = "/";
  storedir = "/tmp";
  } // fileName = UIDGenerator.getUID(); File storefile = new File(MimeUtility.decodeText(storedir) + MimeUtility.decodeText(separator) + MimeUtility.decodeText(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 {
  
  Properties props = System.getProperties();
  
  props.put("mail.smtp.host", " smtp.163.com");
  
  props.put("mail.smtp.auth", "true");
  
  Session session = Session.getDefaultInstance(props, null);
  
  URLName urln = new URLName("pop3", "pop.163.com", 110, null,
  
  "[用户名]", "[密码]");
  
  Store store = session.getStore(urln);
  
  store.connect();
  
  Folder folder = store.getFolder("INBOX");
  
  folder.open(Folder.READ_ONLY);
  
  Message message[] = folder.getMessages();
  
  System.out.println("Messages's length: " + message.length);
  
  ReciveOneMail pmm = null;
  Date sendDate = null;
  Date today = null;
  Date date = new Date();
  Date day = new Date();
  SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd");
  try{
  for (int i = 0; i < message.length; i++) {
  pmm = new ReciveOneMail((MimeMessage) message[i]);
  pmm.setDateFormat("yyyy/MM/dd");
  
  String send_date = pmm.getSentDate();
  sendDate = format.parse(send_date);
  today = format.parse(format.format(day));
  today.compareTo(sendDate);
  today.after(sendDate);
  System.out.println("Message " + i + " 是新邮件: " + pmm.isNew()); //是否是新邮件
  System.out.println("第"+i+"封");
  System.out.println("======================");
  
  System.out.println("Message " + i + " 主题: " + setDecodeText(pmm.getSubject())); //获取主题
  System.out.println("Message " + i + " 发送日期: "+ pmm.getSentDate()); //获取邮件发送日期
  System.out.println("Message " + i + " 是否需要回复: "+ pmm.getReplySign());//
  
  System.out.println("Message " + i + " 是否新邮件: " + pmm.isNew()); //是否是新邮件
  System.out.println("Message " + i + " 是否包含附件: "+ pmm.isContainAttach((Part) message[i])); //是否包含附件
  System.out.println("Message " + i + " 发件人和地: " + pmm.getFrom()); //获取发件人和地址
  System.out.println("Message " + i + " 收件人: "+ pmm.getMailAddress("to")); //收件人
  System.out.println("Message " + i + " 抄送人: "+ pmm.getMailAddress("cc")); //抄送人
  System.out.println("Message " + i + " 密抄送人: "+ pmm.getMailAddress("bcc")); //密抄送人
  // pmm.setDateFormat("yy年MM月dd日 HH:mm");
  
  System.out.println("Message " + i + " 收件时间 "+ pmm.getSentDate());
  
  System.out.println("Message " + i + " 邮件的ID: "+ pmm.getMessageId()); //获取邮件的ID
  // 获得邮件内容===============
  
  // pmm.getMailContent((Part) message[i]);
  
  System.out.println("Message " + i + " 邮件内容: \r\n"
  
  + pmm.getBodyText());
  
  System.out.println("附件的路径"+pmm.getAttachPath());
  pmm.setAttachPath("D:\tmp\");
  
  pmm.saveAttachMent((Part) message[i]);
  today.after(sendDate);
  folder.close(true);
  store.close();
  }
  }catch(Exception e){
  e.printStackTrace();
  }
  }
  
  }
  [/code]
  [b]问题补充：[/b]
  收取的时候，标题，内容附件都会出现乱码，
  而标题和附件的乱码经常会导致转换异常。。。
  pmm.saveAttachMent((Part) message[i]);
  
  这行也经常报异常

改了一下你的代码，用21CN的邮箱试了一下。除非本来是乱码，否则还是正常的，附件也可以正常保存。

[code="java"]

import java.io.*;

import java.text.*;

import java.util.*;

import javax.mail.*;

import javax.mail.internet.*;

/**

有一封邮件就需要建立一个ReciveMail对象

*/

public class ReceiveOneMail {

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

private String dateformat = "yy-MM-dd HH:mm"; //默认的日前显示格式
public ReceiveOneMail(MimeMessage mimeMessage) {

this.mimeMessage = mimeMessage;

}
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(); //发件人的姓名
  if (personal == null)
  personal = "";
  String fromaddr = personal + "<" + from + ">"; //发件人的地址
  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(0);
  }
  } else {
  throw new Exception("Error emailaddr type!");
  }
  return mailaddr;
  }
/**
- 获得有中文字的参数, 转成 UTF-8 encoding, default 为 "" .
- @param request
- @param name
- 参数名.
- @return
  /
  public static String setDecodeText( String name) {
  String tmp = "";
  try {
  tmp = new String( name.getBytes(
  "ISO-8859-1"), "UTF-8");
  } catch (UnsupportedEncodingException e) {
  }
  return tmp;
  }
  /*
- 获得邮件主题
  
  */
  
  public String getSubject() throws MessagingException {
  
  String subject = "";
  
  try {
  
  subject = mimeMessage.getSubject();
  
  String header = ((MimeMessage)mimeMessage).getHeader("SUBJECT")[0];
  
  if ((header.toLowerCase().indexOf("=?"))>0)
  
  {
  
  subject = new String((subject.getBytes("iso-8859-1")),"gb2312");
  
  }
```
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);
  }
  /*
- 获取收件时间
- @return
- @throws Exception
  */
  public String getReceivedDate() throws Exception{
  Date receivedDate = mimeMessage.getReceivedDate();
  SimpleDateFormat format = new SimpleDateFormat(dateformat);
  return format.format(receivedDate);
}

/**
- 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 = true;
  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 = false;
  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("gbk") != -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 = "D:\tmp";
  } else {
  separator = "/";
  storedir = "/tmp";
  }
  // fileName = UIDGenerator.getUID();
  File storefile = new File(MimeUtility.decodeText(storedir) + MimeUtility.decodeText(separator) + MimeUtility.decodeText(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 {
  
  Properties props = System.getProperties();
  
  props.put("mail.smtp.host", " smtp.21cn.com");
  
  props.put("mail.smtp.auth", "true");
  
  Session session = Session.getDefaultInstance(props, null);
  //session.setDebug(true);
  URLName urln = new URLName("pop3", "pop.21cn.com", 110, null,
  
  "[用户名]", "[密码]");
  
  Store store = session.getStore(urln);
  
  store.connect();
  
  Folder folder = store.getFolder("INBOX");
  
  folder.open(Folder.READ_ONLY);
  System.out.println(folder.isOpen());
  Message message[] = folder.getMessages();
  System.out.println("!1folder.isOpen():"+folder.isOpen());
  System.out.println("Messages's length: " + message.length);
  
  ReceiveOneMail pmm = null;
  
  Date sendDate = null;
  
  Date today = null;
  
  Date day = new Date();
  SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd");
  try{
  
  for (int i = 0; i < message.length; i++) {
  
  pmm = new ReceiveOneMail((MimeMessage) message[i]);
  
  pmm.setDateFormat("yyyy/MM/dd");
  System.out.println("!2folder.isOpen():"+folder.isOpen());
  String send_date = pmm.getSentDate();
  
  sendDate = format.parse(send_date);
  
  today = format.parse(format.format(day));
  
  today.compareTo(sendDate);
  
  today.after(sendDate);
  
  System.out.println("Message " + i + " 是新邮件: " + pmm.isNew()); //是否是新邮件
  
  System.out.println("第"+i+"封");
  
  System.out.println("======================");
  
  System.out.println("Message " + i + " 主题: " + pmm.getSubject()); //获取主题
  
  System.out.println("Message " + i + " 发送日期: "+ pmm.getSentDate()); //获取邮件发送日期
  
  System.out.println("Message " + i + " 是否需要回复: "+ pmm.getReplySign());//
  
  System.out.println("Message " + i + " 是否新邮件: " + pmm.isNew()); //是否是新邮件
  
  System.out.println("Message " + i + " 是否包含附件: "+ pmm.isContainAttach((Part) message[i])); //是否包含附件
  
  System.out.println("Message " + i + " 发件人和地: " + pmm.getFrom()); //获取发件人和地址
  
  System.out.println("Message " + i + " 收件人: "+ pmm.getMailAddress("to")); //收件人
  
  System.out.println("Message " + i + " 抄送人: "+ pmm.getMailAddress("cc")); //抄送人
  
  System.out.println("Message " + i + " 密抄送人: "+ pmm.getMailAddress("bcc")); //密抄送人
  
  // pmm.setDateFormat("yy年MM月dd日 HH:mm");
  
  System.out.println("Message " + i + " 收件时间 "+ pmm.getSentDate());
  
  System.out.println("Message " + i + " 邮件的ID: "+ pmm.getMessageId()); //获取邮件的ID
  
  // 获得邮件内容===============
  
  pmm.getMailContent((Part) message[i]);
  
  System.out.println("Message " + i + " 邮件内容: \r\n"
  
  + pmm.getBodyText());
  
  System.out.println("附件的路径"+pmm.getAttachPath());
  
  pmm.setAttachPath("D:\tmp\");
  
  pmm.saveAttachMent((Part) message[i]);
  
  today.after(sendDate);
  
  }
  folder.close(true);
  
  store.close();
  
  }catch(Exception e){
  
  e.printStackTrace();
  
  }
  
  }
  
  }

[/code]

先解决一个问题。

     for (int i = 0; i < flag.length; i++) {       
        if (flag[i] == Flags.Flag.SEEN) { 
            //有一个被看过这isnew就会等于true;
            isnew = true;       
            System.out.println("seen Message.......");       
            break;       
        }       
    }

那么isNew返回false肯定就是表示所有都是新的啦，你的isNew改为isSeen会好点。。

不知道你那一行代码会遇到乱码？