javamail定时读取邮箱的未读邮件（imap）
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为啥不用pop3而用imap，是因为imap能把邮件设置为已读，而pop3不能；
使用javamail mail.imap读取邮箱的邮件，综合网上的例子，贴出自己实际使用的代码供大家参考：
步骤： 1、设置被读取邮箱的安全性，允许我们的系统读取邮件，例如：网易邮箱，当读取邮件的时候，网易的邮箱会受到一封标题为“网易邮箱提醒：阻止了一次不安全的收信请求“的邮件
第二部：读取邮件和附件，每次读取未读的邮件，读完后，把邮件设为未读，我的这个需求不会考虑人工登录邮箱，读取邮件的情况，如果需要考虑，请略作修改
package com.ch.service.imp;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.util.Date;import java.util.Properties;import javax.annotation.Resource;import javax.mail.Address;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.internet.InternetAddress;import javax.mail.internet.MimeMessage;import javax.mail.internet.MimeMultipart;import javax.mail.internet.MimeUtility;import org.springframework.stereotype.Service;import com.ch.dao.DocInfoMapper;import com.ch.dao.EmailInfoMapper;import com.ch.entity.DocInfo;import com.ch.entity.EmailInfo;import com.ch.service.MailInfoService;import com.ch.util.Constant;import com.ch.util.RmdeskConfig;import com.ch.util.TypeCastUtil;import com.sun.mail.imap.IMAPFolder;import com.sun.mail.imap.IMAPStore;@Service("mailInfoService")public class MailInfoServiceImpl implements MailInfoService{ @Resource private DocInfoMapper infoMapper; @Resource private EmailInfoMapper emailInfoMapper; @Overridepublic void readMail(){try {Properties prop = System.getProperties();prop.put("mail.store.protocol", RmdeskConfig.mailstoreprotocol);prop.put("mail.imap.host", RmdeskConfig.mailimaphost);Session session = Session.getInstance(prop);IMAPStore store = (IMAPStore) session.getStore(RmdeskConfig.mailstoreprotocol); // 使用imap会话机制，连接服务器store.connect(RmdeskConfig.euser, RmdeskConfig.epassword);IMAPFolder folder = (IMAPFolder) store.getFolder("INBOX"); // 收件箱folder.open(Folder.READ_WRITE);//获取未读邮件Message[] messages = folder.getMessages(folder.getMessageCount()-folder.getUnreadMessageCount()+1,folder.getMessageCount());parseMessage(messages); //解析邮件//释放资源if (folder != null) folder.close(true);if (store != null) store.close();System.out.println("读取成功。。。。。。。。。。。。");} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}} /** * 解析邮件 * @param messages 要解析的邮件列表 */ private void parseMessage(Message ...messages) throws MessagingException, IOException { if (messages == null || messages.length < 1) throw new MessagingException("未找到要解析的邮件!"); // 解析所有邮件 for (int i = 0, count = messages.length; i < count; i++) { MimeMessage msg = (MimeMessage) messages[i]; msg.setFlag(Flags.Flag.SEEN, true); //存储邮件信息 EmailInfo emaininfo = new EmailInfo(); emaininfo.setEmailcode(msg.getMessageID()); //ID InternetAddress address = getFrom(msg); emaininfo.setSender(address.getPersonal()+"<" + address.getAddress() + ">");//张三<zhangsan@163.com> emaininfo.setTitle(decodeText(msg.getSubject()));//转码后的标题 emaininfo.setReceiver(getReceiveAddress(msg, null));//收件人 emaininfo.setAccepttime(msg.getSentDate());//收件日期 emaininfo.setCheckstatus(Constant.CHECK_STATUS_NO); try { emailInfoMapper.insert(emaininfo);} catch (Exception e) {// TODO: handle exceptione.printStackTrace();System.out.println("----邮件信息存入数据库失败了。。。。。");} if (isContainAttachment(msg)) {//保存附件 saveAttachment(msg, RmdeskConfig.filepath,address.getAddress(),address.getPersonal()); } } } /** * 获得邮件发件人 * @param msg 邮件内容 * @return 地址 * @throws MessagingException * @throws UnsupportedEncodingException */ private InternetAddress getFrom(MimeMessage msg) throws MessagingException, UnsupportedEncodingException { Address[] froms = msg.getFrom(); if (froms.length < 1) throw new MessagingException("没有发件人!"); return (InternetAddress) froms[0]; } /** * 根据收件人类型，获取邮件收件人、抄送和密送地址。如果收件人类型为空，则获得所有的收件人 * <p>Message.RecipientType.TO 收件人</p> * <p>Message.RecipientType.CC 抄送</p> * <p>Message.RecipientType.BCC 密送</p> * @param msg 邮件内容 * @param type 收件人类型 * @return 收件人1 <邮件地址1>, 收件人2 <邮件地址2>, ... * @throws MessagingException */ private String getReceiveAddress(MimeMessage msg, Message.RecipientType type) throws MessagingException { StringBuffer receiveAddress = new StringBuffer(); Address[] addresss = null; if (type == null) { addresss = msg.getAllRecipients(); } else { addresss = msg.getRecipients(type); } if (addresss == null || addresss.length < 1) throw new MessagingException("没有收件人!"); for (Address address : addresss) { InternetAddress internetAddress = (InternetAddress)address; receiveAddress.append(internetAddress.toUnicodeString()).append(","); } receiveAddress.deleteCharAt(receiveAddress.length()-1); //删除最后一个逗号 return receiveAddress.toString(); } /** * 判断邮件中是否包含附件 * @param msg 邮件内容 * @return 邮件中存在附件返回true，不存在返回false * @throws MessagingException * @throws IOException */ private boolean isContainAttachment(Part part) throws MessagingException, IOException { boolean flag = false; if (part.isMimeType("multipart/*")) { MimeMultipart multipart = (MimeMultipart) part.getContent(); int partCount = multipart.getCount(); for (int i = 0; i < partCount; i++) { BodyPart bodyPart = multipart.getBodyPart(i); String disp = bodyPart.getDisposition(); if (disp != null && (disp.equalsIgnoreCase(Part.ATTACHMENT) || disp.equalsIgnoreCase(Part.INLINE))) { flag = true; } else if (bodyPart.isMimeType("multipart/*")) { flag = isContainAttachment(bodyPart); } else { String contentType = bodyPart.getContentType(); if (contentType.indexOf("application") != -1) { flag = true; } if (contentType.indexOf("name") != -1) { flag = true; } } if (flag) break; } } else if (part.isMimeType("message/rfc822")) { flag = isContainAttachment((Part)part.getContent()); } return flag; } /** * 保存附件 * @param part 邮件中多个组合体中的其中一个组合体 * @param destDir 附件保存目录 * @throws UnsupportedEncodingException * @throws MessagingException * @throws FileNotFoundException * @throws IOException */ private void saveAttachment(Part part, String destDir,String email,String sendName) throws UnsupportedEncodingException, MessagingException, FileNotFoundException, IOException { if (part.isMimeType("multipart/*")) { Multipart multipart = (Multipart) part.getContent(); //复杂体邮件 //复杂体邮件包含多个邮件体 int partCount = multipart.getCount(); for (int i = 0; i < partCount; i++) { //获得复杂体邮件中其中一个邮件体 BodyPart bodyPart = multipart.getBodyPart(i); //某一个邮件体也有可能是由多个邮件体组成的复杂体 String disp = bodyPart.getDisposition(); if (disp != null && (disp.equalsIgnoreCase(Part.ATTACHMENT) || disp.equalsIgnoreCase(Part.INLINE))) { InputStream is = bodyPart.getInputStream(); this.saveFile(is, destDir, decodeText(bodyPart.getFileName()),email,sendName); } else if (bodyPart.isMimeType("multipart/*")) { saveAttachment(bodyPart,destDir,email,sendName); } else { String contentType = bodyPart.getContentType(); if (contentType.indexOf("name") != -1 || contentType.indexOf("application") != -1) { this.saveFile(bodyPart.getInputStream(), destDir, decodeText(bodyPart.getFileName()),email,sendName); } } } } else if (part.isMimeType("message/rfc822")) { saveAttachment((Part) part.getContent(),destDir,email,sendName); } } /** * 读取输入流中的数据保存至指定目录 * @param is 输入流 * @param fileName 文件名 * @param destDir 文件存储目录 * @throws FileNotFoundException * @throws IOException */ private void saveFile(InputStream is, String destDir, String fileName,String email,String sendName) throws FileNotFoundException, IOException { //附件格式过滤 if(!TypeCastUtil.equals(RmdeskConfig.extname, TypeCastUtil.getFileDot(fileName))){ return; } DocInfo doc = new DocInfo(); doc.setDocName(fileName); String uuidFilename = TypeCastUtil.getUUIDFileName(fileName); doc.setUrl(uuidFilename); doc.setBusinessLine("测试"); doc.setReceivedMode(Constant.OWNER_TYPE_EMAIL); doc.setReceivedTime(new Date()); doc.setOwnerEmail(email); doc.setOwnerName(sendName); //TODO:入库 try { infoMapper.insert(doc);} catch (Exception e) {e.printStackTrace();System.out.println("----附件存入数据库失败了。。。。。");} BufferedInputStream bis = new BufferedInputStream(is); BufferedOutputStream bos = new BufferedOutputStream( new FileOutputStream(new File(destDir + uuidFilename))); int len = -1; while ((len = bis.read()) != -1) { bos.write(len); bos.flush(); } bos.close(); bis.close(); } /** * 文本解码 * @param encodeText 解码MimeUtility.encodeText(String text)方法编码后的文本 * @return 解码后的文本 * @throws UnsupportedEncodingException */ private String decodeText(String encodeText) throws UnsupportedEncodingException { if (encodeText == null || "".equals(encodeText)) { return ""; } else { return MimeUtility.decodeText(encodeText); } } }3、定时器以及项目启动时启动定时器
package com.ch.util;import java.util.Timer;import java.util.TimerTask;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;import com.ch.service.MailInfoService;public class RmdeskServletContextListener implements ServletContextListener {@Overridepublic void contextInitialized(ServletContextEvent arg0) {System.out.println("-------------进入---ServletContextEvent----------------");Timer timer = new Timer();//ApplicationContext context = new ClassPathXmlApplicationContext("classpath:resources/conf/application-*.xml");final MailInfoService service = SpringContextUtil.getBean("mailInfoService");//(MailInfoService)context.getBean("mailInfoService");timer.schedule(new TimerTask() {@Overridepublic void run() {// TODO Auto-generated method stubservice.readMail();}}, 1000,1000*60*60*24);//1000*60*60*24}@Overridepublic void contextDestroyed(ServletContextEvent args) {// TODO Auto-generated method stub}}web.xml
<listener> <listener-class>com.ch.util.RmdeskServletContextListener</listener-class> </listener>
IMAPMessage imapMessage =(IMAPMessage)message;MimeMessage cmsg = new MimeMessage((MimeMessage) imapMessage); System.out.println("内容：" + cmsg.getContent());另：摘抄网上的读取文件内容，我自己的项目中用不到，供大家参考
/** * 获得邮件文本内容 * @param part 邮件体 * @param content 存储邮件文本内容的字符串 * @throws MessagingException * @throws IOException */ public static void getMailTextContent(Part part, StringBuffer content) throws MessagingException, IOException { //如果是文本类型的附件，通过getContent方法可以取到文本内容，但这不是我们需要的结果，所以在这里要做判断 boolean isContainTextAttach = part.getContentType().indexOf("name") > 0; if (part.isMimeType("text/*") && !isContainTextAttach) { content.append(part.getContent().toString()); } else if (part.isMimeType("message/rfc822")) { getMailTextContent((Part)part.getContent(),content); } else if (part.isMimeType("multipart/*")) { Multipart multipart = (Multipart) part.getContent(); int partCount = multipart.getCount(); for (int i = 0; i < partCount; i++) { BodyPart bodyPart = multipart.getBodyPart(i); getMailTextContent(bodyPart,content); } } } 暂时就到这里了，有疑问欢迎大家随时沟通！
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