javamail例子

javamail收邮件示例：
需要包javamail.jar，activation.jar

列子：
package com.acestek.lbs.terminal;
import java.io.*;
import java.text.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

import org.apache.log4j.Logger;


public class CheckMail {

/**
* Logger for this class
*/
private static final Logger logger = Logger
.getLogger(CheckMail.class);

    private MimeMessage mimeMessage = null;
    private String saveAttachPath = "d:\\";          //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 CheckMail(){}
    public CheckMail(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="d:\\";
        }else{
            separator = "/";
            storedir = "/mail";
        }
        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();
            }
            logger.info("附件已保存到"+storedir);
        }catch(Exception exception){
            exception.printStackTrace();
            throw new Exception("文件保存失败!");
        }finally{
            bos.close();
            bis.close();
        }
    }

  /**

     * delete mail

     */

    public static void deleteMail()
    {
        String host = "pop3.sina.com";
        String userName = "xingui5624";
        String passWord = "******";

        Properties props = new Properties();
        //Properties props = System.getProperties();这种方法创建 Porperties 同上

        Session session = Session.getDefaultInstance(props);
        session.setDebug(true);
        try {
            System.out.println("begin delete ...........");
            Store store = session.getStore("pop3");
            store.connect(host, userName, passWord);//验证邮箱
            Folder folder = store.getFolder("INBOX");
            folder.open(Folder.READ_WRITE);//设置我读写方式打开
            int countOfAll = folder.getMessageCount();//取得邮件个数
            int unReadCount = folder.getUnreadMessageCount();//已读个数
            int newOfCount = folder.getNewMessageCount();//未读个数
            System.out.println("总个数：" +countOfAll);
            System.out.println("已读个数：" +unReadCount);
            System.out.println("未读个数：" +newOfCount);
            for(int i=1; i<=countOfAll; i++)
            {
                Message message = folder.getMessage(i);
                message.setFlag(Flags.Flag.DELETED, true);//设置已删除状态为true
                if(message.isSet(Flags.Flag.DELETED))
                    System.out.println("已经删除第"+i+"邮件。。。。。。。。。");
            }
            folder.close(true);
            store.close();
            System.out.println("delete ok.................................");
        } catch (NoSuchProviderException e) {
            e.printStackTrace();
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }


}


调用示例：
  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]);
        }
    }
}
/***************************/
public boolean  getMail()
{
boolean hasAttach =false;
try{

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("共有: "+message.length+"封邮件");
        CheckMail pmm = null;
        for(int i=0;i<message.length;i++){
        if(i==(message.length-1))
        {
            pmm = new CheckMail((MimeMessage)message[i]);
            System.out.println("Message "+i+" 主题: "+pmm.getSubject());
            System.out.println("Message "+i+" 发送日期: "+pmm.getSentDate());
           // System.out.println("Message "+i+" 是否需要回执: "+pmm.getReplySign());
           // System.out.println("Message "+i+" 是否已读: "+pmm.isNew());
            System.out.println("Message "+i+" 是否有附件: "+pmm.isContainAttach((Part)message[i]));
            System.out.println("Message "+i+" 发件人: "+pmm.getFrom());
            //System.out.println("Message "+i+" 收件人: "+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+" 发送日期: "+pmm.getSentDate());
            //System.out.println("Message "+i+" Message-ID: "+pmm.getMessageId());
           // pmm.getMailContent((Part)message[i]);
           // System.out.println("Message "+i+" 正文: \r\n"+pmm.getBodyText());
            pmm.setAttachPath("d:\\");
            pmm.saveAttachMent((Part)message[i]);
            if(pmm.isContainAttach((Part)message[i]))
            {
            hasAttach=true;
            }
        }
        }
        return hasAttach;
}
catch(Exception e)
{
return false;
}
}