邮件下载及发送，获取邮件数各种数据

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());
        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 = "pop3.163.com"; // 【pop.mail.yahoo.com.cn】
        String username = "***@163.com"; 
        String password = "***";
         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 + "  containAttachment: "+ 
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　pmm.isContainAttach((Part) message[i]));
            System.out.println("Message " + i + " form: " + pmm.getFrom());
            System.out.println("Message " + i + " to: "+ pmm.getMailAddress("to"));
            pmm.setDateFormat("yy年MM月dd日 HH:mm");
            pmm.getMailContent((Part) message[i]);
            System.out.println("Message " + i + " bodycontent: 
"+ pmm.getBodyText());
            File file = new File("e:\tmp\");
             if (!file.exists()) {
                file.mkdirs();
            }
            pmm.setAttachPath(file.toString());
            pmm.saveAttachMent((Part) message[i]);
        }
    }
    
    
    /***************下载邮件保存到本地*******************/  
    /**305      * @param date
     * @return
     * @throws MessagingException
     * @throws FileNotFoundException 
     */
    public MimeMessage getEmailInstance(Date date, String path, String from, String to, String subjects, String cc) throws Exception{
        MimeMessage msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(from)); 
        msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to)) ; 
        if(null!=cc&&!"".equals(cc)){
            msg.setRecipients(Message.RecipientType.CC, InternetAddress.parse(cc)); 
        }
        msg.setRecipients(Message.RecipientType.BCC, InternetAddress.parse(bcc)) ;
        subjects = transferChinese(subjects);
        msg.setSubject(subjects);  
        // 构造Multipart  
        Multipart mp =  getMultipartEmailInstance();
        // 向Multipart添加MimeMessage
        msg.setContent(mp);  
        msg.setSentDate(date);  
        File file = new File(path);
        FileOutputStream fs = new FileOutputStream(file);
        msg.writeTo(fs);
        fs.close();
        return msg;
    }
    //处理附件
    public Multipart getMultipartEmailInstance(){
        Multipart mp = new MimeMultipart();  
        try{
            // 向Multipart添加正文  
            MimeBodyPart mbpContent = new MimeBodyPart();  
            mbpContent.setContent(contents, "text/html;charset=utf-8");  
            // 向MimeMessage添加（Multipart代表正文）  
            mp.addBodyPart(mbpContent);  
            // 向Multipart添加附件  
            Enumeration<String> efile = file.elements();  
            while (efile.hasMoreElements()) {  

                MimeBodyPart mbpFile = new MimeBodyPart();  
                filename = efile.nextElement().toString();  
                FileDataSource fds = new FileDataSource(filename);  
                mbpFile.setDataHandler(new DataHandler(fds));  
               // <span style="color: #ff0000;">//这个方法可以解决附件乱码问题。</span>    
                String filename= new String(MimeUtility.encodeText(new String(fds.getName().getBytes(),"GB2312"), "GB2312", "B"));  
                mbpFile.setFileName(filename);  
                // 向MimeMessage添加（Multipart代表附件）  
                mp.addBodyPart(mbpFile);  
            }  
            file.removeAllElements();  
        }catch(Exception ce){
            log.error("==========邮件附件异常=================="+ce.getMessage());
        }
        return mp;
    }
    
    //处理抄送信息
    public String formatAddress(Address[] addr) {
        StringBuffer sb = new StringBuffer();
        if (addr == null) {
            return "";
        }
        for (int i = 0; i < addr.length; i++) {
            Address a = addr[i];
            if (a instanceof InternetAddress) {
                InternetAddress ia = (InternetAddress)a;
                sb.append(ia.getPersonal() + "<" + ia.getAddress() + ">,");
            } else {
                sb.append(a.toString());
            }
        }
        if (sb.length() != 0) {
            return sb.substring(0,sb.length()-1);
        }
        return "";
    }
/************************************************/ 
}

不通过服务，通过 cmd 命令打开，用 java 实现

Runtime.getRuntime().exec("cmd/C" + path);  //path 根据文件实际路径设置