前段時間一直忙於學校裡面的事情，沒有時間靜下心來寫接收郵件的程序，現在學校裡的事情終於忙完了，可以靜下心裡做自己喜歡做的事情了，這種感覺真的很好！
對我自己而言，剛開始在用JavaMail來編寫收郵件的程序時最重要和最難的要數解析附件和郵件正文的部分，因為Mime類型實在是太多了！下面的這段代碼是我自己學習JavaMail的一段體會，供大家來參考（請高手指教，有什麼更好的辦法，請回復此文章),具體代碼如下：
package coffeecatwebmail;
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 = ""; //附件下載後的存放目錄
private StringBuffer bodytext = new StringBuffer();
//存放郵件內容的StringBuffer對象
private String dateformat = "yy-MM-dd HH:mm"; //默認的日前顯示格式
/**
* 構造函數,初始化一個MimeMessage對象
*/
public PraseMimeMessage(){}
public PraseMimeMessage(MimeMessage mimeMessage){
this.mimeMessage = mimeMessage;
System.out.println("create a PraseMimeMessage object........");
}
public void setMimeMessage(MimeMessage mimeMessage){
this.mimeMessage = mimeMessage;
}
/**
* 獲得發件人的地址和姓名
*/
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;
}
/**
* 獲得郵件的收件人，抄送，和密送的地址和姓名，根據所傳遞的參數的不同
* "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;
}
/**
* 獲得郵件主題
*/
public String getSubject()throws MessagingException{
String subject = "";
try{
subject = MimeUtility.decodeText(mimeMessage.getSubject());
if(subject == null) subject="";
}catch(Exception exce){
}
return subject;
}
/**
* 獲得郵件發送日期
*/
public String getSentDate()throws Exception{
Date sentdate = mimeMessage.getSentDate();
SimpleDateFormat format = new SimpleDateFormat(dateformat);
return format.format(sentdate);
}
/**
* 獲得郵件正文內容
*/
public String getBodyText(){
return bodytext.toString();
}
/**
* 解析郵件，把得到的郵件內容保存到一個StringBuffer對象中，解析郵件
* 主要是根據MimeType類型的不同執行不同的操作，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{}
}
/**
* 判斷此郵件是否需要回執，如果需要回執返回"true",否則返回"false"
*/
public boolean getReplySign()throws MessagingException{
boolean replysign = false;
String needreply[] = mimeMessage.getHeader("Disposition-Notification-To");
if(needreply != null){
replysign = true;
}
return replysign;
}
/**
* 獲得此郵件的Message-ID
*/
public String getMessageId()throws MessagingException{
return mimeMessage.getMessageID();
}
/**
* 【判斷此郵件是否已讀，如果未讀返回返回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;
}
/**
* 判斷此郵件是否包含附件
*/
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());
}
}
/**
* 【設置附件存放路徑】
*/
public void setAttachPath(String attachpath){
this.saveAttachPath = attachpath;
}
/**
* 【設置日期顯示格式】
*/
public void setDateFormat(String format)throws Exception{
this.dateformat = format;
}
/**
* 【獲得附件存放路徑】
*/
public String getAttachPath(){
return saveAttachPath;
}
/**
* 【真正的保存附件到指定目錄裡】
*/
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());
//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("文件保存失敗!");
}finally{
bos.close();
bis.close();
}
}
/**
* PraseMimeMessage類測試
*/
public static void main(String args[])throws Exception{
String host = "主機名/ip"; //【pop.mail.yahoo.com.cn】
String username ="用戶名"; //【wwp_1124】
String password ="密碼"; //【........】
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]);
}
}
}
上面就是用JavaMail來解析MimeMessage的具體程序代碼，具體使用方法參考main方法裡的測試代碼，請大家在看過之余多提寶貴的意見，共同學習，共同成長！！
