JAVAMAil收取邮件为什么不能判断是否是新邮件

代码如下。。。我收取到的邮件判断的都是false,没有一个true的。
这代码收取邮件会出现乱码。。。不知道怎么解决。。。希望能帮帮忙。。。

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();
        }
    }    
}

怎么运行时出现 javax.mail.MessagingException: Connect failed;
  nested exception is:
java.net.SocketException: Connection reset
at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:106)
at javax.mail.Service.connect(Service.java:233)
at javax.mail.Service.connect(Service.java:134)
at javax.mail.Service.connect(Service.java:86)
at myplugin.actions.MailFetcher.listMails(MailFetcher.java:58)
at myplugin.actions.MailFetcher.listMails(MailFetcher.java:40)
at myplugin.actions.MailFetcher.main(MailFetcher.java:131)
这样的错误

pop3不会告诉你是否是新邮件 统统收下来自己判断 imap好像可以 是好像 你去查一下

楼上正解.

怎么不能获得邮件正文内容呢？