内容来自：http://www.oschina.net/bbs/thread/528

以下代码经过测试了的能通过

我在用javaMail做收邮件时怎么邮件内容重复(一种文本格式的,一种html格式的),并且图片无法正常显示:

答：内容重复，因为很多邮件工具在发送HTML邮件的时候，为了防止接收端无法阅读html邮件，都附送了一份纯文本的邮件。解析的时候需要对这种情况进行过滤

这是我用的代码:请高手指教:

package com.espeed.test;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Properties;

import javax.mail.BodyPart;

import javax.mail.Flags;

import javax.mail.Folder;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.Multipart;

import javax.mail.Part;

import javax.mail.Session;

import javax.mail.Store;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

import javax.mail.internet.MimeUtility;

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;

}

public void setMimeMessage(MimeMessage mimeMessage){

this.mimeMessage=mimeMessage;

}

/**

*　获得发件人的地址和姓名

*/

public String getFrom1()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+"";

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

* @throws Exception */

public String getMailAddress(String type){

String mailaddr="";

try {

String addtype=type.toUpperCase();

InternetAddress []address=null;

if(addtype.equals("TO")||addtype.equals("CC")||addtype.equals("BBC")){

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+"";

mailaddr+=","+compositeto;

}

mailaddr=mailaddr.substring(1);

}

}

else{

}

} catch (Exception e) {

// TODO: handle exception

}

return mailaddr;

}

/**

*　获得邮件主题

*/

public String getSubject()

{

String subject="";

try {

subject=MimeUtility.decodeText(mimeMessage.getSubject());

if(subject==null)subject="";

} catch (Exception e) {

// TODO: handle exception

}

return subject;

}

/**

*　获得邮件发送日期

*/

public String getSendDate()throws Exception{

Date senddate=mimeMessage.getSentDate();

SimpleDateFormat format=new SimpleDateFormat(dateformat);

return format.format(senddate);

}

/**

*　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;

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

getMailContent(multipart.getBodyPart(i));

}

}else if(part.isMimeType("message/rfc822")){

getMailContent((Part)part.getContent());

}

else{}

}

/**

*　获得邮件正文内容

*/

public String getBodyText(){

return bodytext.toString();

}

/**

*　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"

* @throws MessagingException */

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

* @throws MessagingException */

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】

* @throws MessagingException */

public boolean isNew() throws MessagingException{

boolean isnew =false;

Flags flags=((Message)mimeMessage).getFlags();

Flags.Flag[]flag=flags.getSystemFlags();

for (int i = 0; i < flag.length; i++) {

if(flag[i]==Flags.Flag.SEEN){

isnew=true;

break;

}

}

return isnew;

}

/**

*　判断此邮件是否包含附件

* @throws MessagingException */

public boolean isContainAttach(Part part) throws Exception{

boolean attachflag=false;

String contentType=part.getContentType();

if(part.isMimeType("multipart/*")){

Multipart mp=(Multipart)part.getContent();

//获取附件名称可能包含多个附件

for(int j=0;j

BodyPart mpart=mp.getBodyPart(j);

String disposition=mpart.getDescription();

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】

* @throws Exception

* @throws IOException

* @throws MessagingException

* @throws Exception */

public void saveAttachMent(Part part) throws Exception {

String fileName="";

if(part.isMimeType("multipart/*")){

Multipart mp=(Multipart)part.getContent();

for(int j=0;j

BodyPart mpart=mp.getBodyPart(j);

String disposition=mpart.getDescription();

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/*")){

fileName=mpart.getFileName();

}

else{

fileName=mpart.getFileName();

if((fileName!=null)){

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){

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){

//如果是window 操作系统

separator="/";

if(storedir==null||storedir.equals(""))storedir="c:\tmp";

}

else{

//如果是其他的系统

separator="/";

storedir="/tmp";

}

File strorefile=new File(storedir+separator+fileName);

BufferedOutputStream bos=null;

BufferedInputStream bis=null;

try {

bos=new BufferedOutputStream(new FileOutputStream(strorefile));

bis=new BufferedInputStream(in);

int c;

while((c=bis.read())!=-1){

bos.write(c);

bos.flush();

}

} catch (Exception e) {

// TODO: handle exception

}finally{

bos.close();

bis.close();

}

}

/**

*　PraseMimeMessage类测试

* @throws Exception */

public static void main(String[] args) throws Exception {

String host="mail.21gmail.com";

String username="fjj0@21gmail.com";

String password="123456789";

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();

PraseMimeMessage pmm=null;

for (int i = 0; i < message.length; i++) {

System.out.println("****************************************第"+(i+1)+"封邮件**********************************");

pmm=new PraseMimeMessage((MimeMessage)message[i]);

System.out.println("主题 :"+pmm.getSubject());

pmm.setDateFormat("yy年MM月dd日 HH:mm");

System.out.println("发送时间 :"+pmm.getSendDate());

System.out.println("是否回执 :"+pmm.getReplySign());

System.out.println("是否包含附件 :"+pmm.isContainAttach((Part)message[i]));

System.out.println("发件人 :"+pmm.getFrom1());

System.out.println("收件人 :"+pmm.getMailAddress("TO"));

System.out.println("抄送地址 :"+pmm.getMailAddress("CC"));

System.out.println("密送地址 :"+pmm.getMailAddress("BCC"));

System.out.println("邮件ID :"+i+":"+pmm.getMessageId());

pmm.getMailContent((Part)message[i]);  //根据内容的不同解析邮件

pmm.setAttachPath("d:/temp");  //设置邮件附件的保存路径

pmm.saveAttachMent((Part)message[i]); //保存附件

System.out.println("邮件正文 :"+pmm.getBodyText());

System.out.println("*********************************第"+(i+1)+"封邮件结束*************************************");

}

}

}