Java mail接收邮件 回复邮件 转发邮件
来源：互联网 发布：淘宝网卧室台灯 编辑：程序博客网 时间：2024/05/29 14:36
下面的代码在很多别的博客上都有，我只是copy过来学习了下，并且做了少许的修改，但大多数用的都是POP3协议去接收邮件，如果你实际验证过就应该会发现至少从昨天开始是不能获取邮件的内容的，所以需要用IMAP协议。
具体的各种API可以参照上篇文章里给出的链接。
下面的代码逻辑其实很不好，所有receiveMail函数应该全部在init里面实现的，所以写的不好。
其中代码有些部分还是没有理解的很明白。如果有需要可以找我交流。
下面的代码是完全可以运行的，只要换成你自己的邮箱和密码就可以了。
package com.mail;import java.io.*;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Properties;import javax.mail.Authenticator;import javax.mail.BodyPart;import javax.mail.FetchProfile;import javax.mail.Flags;import javax.mail.Folder;import javax.mail.Message;import javax.mail.Message.RecipientType;import javax.mail.MessagingException;import javax.mail.Multipart;import javax.mail.Part;import javax.mail.PasswordAuthentication;import javax.mail.Session;import javax.mail.Store;import javax.mail.Transport;import javax.mail.internet.AddressException;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeBodyPart;import javax.mail.internet.MimeMessage;import javax.mail.internet.MimeMultipart;import javax.mail.internet.MimeUtility;public class ReceiveMailUtil {private static final String dateformat = "yyyy-MM-dd HH:mm";private static final String saveAttachPath = "D:\\JS";private static final String sendFrom = "******@qq.com";private static final String receiveAddress = "******@163.com";private static final String smtpHost = "smtp.qq.com";private StringBuffer bodyText = new StringBuffer();private String host;private String username;private String password;private Message message[];private Store store = null;private Folder folder = null;private MimeMessage mimeMsg = null;ReceiveMailUtil(String host,String username,String password) throws Exception{this.host = host;this.username = username;this.password = password;init();}ReceiveMailUtil(MimeMessage msg){this.mimeMsg = msg;}private void forwardMail(Session session,ReceiveMailUtil mail) throws Exception, MessagingException{//转发邮件session.setDebug(true);MimeMessage fordward = new MimeMessage(session);fordward.setFrom(new InternetAddress(sendFrom));fordward.setSubject(mail.getSubject());fordward.setRecipients(Message.RecipientType.TO, InternetAddress.parse(receiveAddress));Multipart mp = new MimeMultipart();MimeBodyPart mbp = new MimeBodyPart(); mail.getMailContent((Part)mail.mimeMsg); mbp.setContent("<meta http-equiv=Content-Type content=text/html; charset=GBK>"+ mail.getBodyText(), "text/html;charset=gb2312"); mp.addBodyPart(mbp); fordward.setContent(mp); //Multipart加入到信件 fordward.setSentDate(new Date()); //设置信件头的发送日期 //发送信件 fordward.saveChanges(); Transport.send(fordward); }private void replyMail(Session session,ReceiveMailUtil mail) throws Exception{//回复邮件MimeMessage msg = (MimeMessage) mail.mimeMsg.reply(false);msg.setFrom(new InternetAddress(sendFrom));msg.setRecipients(RecipientType.TO, mail.getFrom());Multipart mp = new MimeMultipart();MimeBodyPart mbp = new MimeBodyPart();mbp.setContent("<meta http-equiv=Content-Type content=text/html; charset=GBK>"+ "您好，您的邮件已经收到，谢谢！", "text/html;charset=gb2312");mp.addBodyPart(mbp);msg.setContent(mp);msg.setSentDate(new Date());msg.saveChanges();Transport trans = session.getTransport("smtp");trans.connect(smtpHost, username, password);trans.sendMessage(msg, msg.getAllRecipients());trans.close();}private static class Email_Autherticatorbean extends Authenticator {//认证private String m_username = null;private String m_userpass = null;public Email_Autherticatorbean(String username, String userpass) {super();setUsername(username);setUserpass(userpass);}public PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication(m_username, m_userpass);}public void setUsername(String username) {m_username = username;}public void setUserpass(String userpass) {m_userpass = userpass;}}private static String base64Decoder(String s) throws Exception {sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();byte[] b = decoder.decodeBuffer(s);return (new String(b,"GBK"));} private void init() throws Exception{Properties props = new Properties();props.setProperty("mail.store.protocol", "imap");props.setProperty("mail.imap.host", host);props.setProperty("mail.transport.protocol","smtp");props.setProperty("mail.smtp.host", smtpHost);props.setProperty("mail.smtp.auth", "true");System.out.println("1"+username+password);Email_Autherticatorbean Auth = new Email_Autherticatorbean(username,password);Session session = Session.getDefaultInstance(props,Auth);store = session.getStore("imap");//session.setDebug(true);store.connect(host,username,password);//Folder folder1 = store.getDefaultFolder();//System.out.println("Default Folder :: " + folder1.getName());//Folder []folders = folder1.list();//System.out.println(folders.length);//for(int i = 0 ; i < folders.length ; i ++){//System.out.println("Folder is ::: " + folders[i].getName());//if(folders[i].getName().equals("Sent Messages") == false//&&folders[i].getName().equals("Deleted Messages") == false)//System.out.println("Length::" + folders[i].getMessageCount()); //}folder = store.getFolder("INBOX");folder.open(Folder.READ_WRITE);//FetchProfile profile = new FetchProfile(); // profile.add(FetchProfile.Item.ENVELOPE);this.message = folder.getMessages();//folder.fetch(message, profile); System.out.println("收件箱的邮件数：" + message.length); System.out.println("未读邮件数：" + folder.getUnreadMessageCount()); System.out.println("新邮件数：" + folder.getNewMessageCount()); int len = message.length; for(int i = len - 1 ; i < len; i ++){ReceiveMailUtil mail = new ReceiveMailUtil((MimeMessage)(message[i])); forwardMail(session,mail);//转发邮件replyMail(session,mail);//回复邮件 }}private String getSubject() throws Exception{String tempSubject = "";tempSubject = MimeUtility.decodeText(mimeMsg.getSubject()); return tempSubject;}private String getSendDate() throws Exception{ Date sentdate = mimeMsg.getSentDate(); SimpleDateFormat format = new SimpleDateFormat(dateformat); return format.format(sentdate); }private String getFrom() throws Exception{InternetAddress address[] = (InternetAddress[]) mimeMsg.getFrom(); String from = address[0].getAddress(); if (from == null) from = ""; return from; }private String getFromandName() throws Exception{InternetAddress address[] = (InternetAddress[]) mimeMsg.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 * @throws Exception */ private 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[]) mimeMsg.getRecipients(Message.RecipientType.TO); }else if (addType.equals("CC")) { address = (InternetAddress[]) mimeMsg.getRecipients(Message.RecipientType.CC); }else { address = (InternetAddress[]) mimeMsg.getRecipients(Message.RecipientType.BCC); } if(address != null){for(int i = 0 ; i < address.length ; i ++){String email = address[i].getAddress();email = (email == null ? "":MimeUtility.decodeText(email));String personal = address[i].getPersonal();personal = (personal == null ? "" : MimeUtility.decodeText(personal));mailAddr += personal + " <"+email+">";}}}return mailAddr;}/** * * 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[] = mimeMsg.getHeader("Disposition-Notification-To"); if (needreply != null) { replysign = true; } return replysign; } /** * * 【判断此邮件是否已读，如果未读返回返回false,反之返回true】 */ private boolean isNew() throws MessagingException { boolean isnew = false; Flags flags = ((Message) mimeMsg).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 */private boolean isContainAttach(Part part) throws Exception { boolean attachflag = false; if(part.isMimeType("multipart/*")){ Multipart mp = (Multipart) part.getContent(); for (int i = 0; i < mp.getCount(); i++) { BodyPart mpart = mp.getBodyPart(i); /**是否存在附件*/ 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++) { System.out.println("multi:: " + i); BodyPart mpart = mp.getBodyPart(i); String disposition = mpart.getDisposition(); if ((disposition != null) && ((disposition.equals(Part.ATTACHMENT)) || (disposition .equals(Part.INLINE)))) { fileName = mpart.getFileName(); System.out.println("mpartFilename::"+fileName); //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){// System.out.println("Filename::"+fileName);// if(fileName.indexOf("?=") != -1){// String s = fileName.substring(8,fileName.indexOf("?="));// s = base64Decoder(s);// System.out.println("SFileName is ::: " + s);// } fileName = MimeUtility.decodeText(fileName); System.out.println("Filename::"+fileName); saveFile(fileName, mpart.getInputStream()); }// if ((fileName != null) // && (fileName.toLowerCase().indexOf("gb2312") != -1)) { // fileName = MimeUtility.decodeText(fileName); // System.out.println("NO");// saveFile(fileName, mpart.getInputStream()); // } } } } else if (part.isMimeType("message/rfc822")) { saveAttachMent((Part) part.getContent()); } } /** * * 【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 = saveAttachPath; 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(); } } public String getBodyText() { return bodyText.toString(); } /** * * 获得此邮件的Message-ID */ public String getMessageId() throws MessagingException { return mimeMsg.getMessageID(); } 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) { /**纯文本邮件*/ bodyText.append((String) part.getContent()); } else if (part.isMimeType("text/html") && !conname) { /**HTML格式邮件*/ bodyText.append((String ) part.getContent()); } else if (part.isMimeType("multipart/*")) { /**multipart邮件*/ 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()); } } public void receiveMail() throws Exception{int len = message.length;System.out.println("Size::: "+len);for(int i = len - 1 ; i < len; i ++){ReceiveMailUtil mail = new ReceiveMailUtil((MimeMessage)(message[i])); //fordwardMail(session,mail);System.out.println("Message " + i + " subject: " + mail.getSubject()); System.out.println("Message " + i + " sentdate: " + mail.getSendDate()); System.out.println("Message " + i + " replysign: " + mail.getReplySign()); System.out.println("Message " + i + " hasRead: " + mail.isNew()); boolean attachFlag = mail.isContainAttach((Part) message[i]); System.out.println("Message " + i + " containAttachment: " + attachFlag); if(attachFlag == true) { System.out.println("attach"); mail.saveAttachMent((Part) message[i]); } System.out.println("Message " + i + " from: " + mail.getFromandName()); System.out.println("Message " + i + " to: " + mail.getMailAddress("to")); System.out.println("Message " + i + " cc: " + mail.getMailAddress("cc")); System.out.println("Message " + i + " bcc: " + mail.getMailAddress("bcc")); System.out.println("Message " + i + " Message-ID: " + mail.getMessageId()); mail.getMailContent((Part) message[i]); System.out.println("Message " + i + " bodycontent: \r\n" + mail.getBodyText());}store.close();}public static void main(String[] args) throws Exception {// TODO Auto-generated method stub//String host = "imap.163.com";//String username = "******@163.com";//String password = "******";String host = "imap.qq.com";String username = "******@qq.com";String password = "******";ReceiveMailUtil mail = new ReceiveMailUtil(host,username,password);//mail.receiveMail();}}- Java mail接收邮件 回复邮件 转发邮件
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