package com.iot.daily.module.web; import javax.mail.*; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import javax.mail.internet.MimeUtility; import java.io.*; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.Properties; /** * <p>ShowMail 此类用于:日报添加控制器</p> * <p>@author:hujm</p> * <p>@date:2021年04月07日 8:45</p> * <p>@remark:</p> */ public class ShowMail { private MimeMessage mimeMessage = null; /** * 附件下载后的存放目录 */ private String saveAttachPath = ""; /** * 存放邮件内容的StringBuffer对象 */ private final StringBuffer bodyText = new StringBuffer(); /** * 默认的日前显示格式 */ private String dateFormat = "yy-MM-dd HH:mm"; /** * 构造函数,初始化一个MimeMessage对象 */ public ShowMail() { } public ShowMail(MimeMessage mimeMessage) { this.mimeMessage = mimeMessage; System.out.println("创建一个ReceiveEmail对象...."); } public void setMimeMessage(MimeMessage mimeMessage) { this.mimeMessage = mimeMessage; System.out.println("设置一个MimeMessage对象..."); } /** * 获得发件人的地址和姓名 * * @throws Exception */ public String getFrom() throws Exception { InternetAddress[] address = (InternetAddress[]) mimeMessage.getFrom(); String from = address[0].getAddress(); if (from == null) { from = ""; System.out.println("无法知道发送者."); } String personal = address[0].getPersonal(); if (personal == null) { personal = ""; System.out.println("无法知道发送者的姓名."); } String fromAddr = null; if (personal != null || from != null) { fromAddr = personal + "<" + from + ">"; System.out.println("发送者是:" + fromAddr); } else { System.out.println("无法获得发送者信息."); } 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 * * @param type * @return * @throws Exception */ 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 emailAddr = address[i].getAddress(); if (emailAddr == null) { emailAddr = ""; } else { System.out.println("转换之前的emailAddr:" + emailAddr); emailAddr = MimeUtility.decodeText(emailAddr); System.out.println("转换之后的emailAddr:" + emailAddr); } String personal = address[i].getPersonal(); if (personal == null) { personal = ""; } else { System.out.println("转换之前的personal:" + personal); personal = MimeUtility.decodeText(personal); System.out.println("转换之后的personal:" + personal); } String compositeto = personal + "<" + emailAddr + ">"; System.out.println("完整的邮件地址:" + compositeto); mailAddr += "," + compositeto; } mailAddr = mailAddr.substring(1); } } else { throw new Exception("错误的电子邮件类型!"); } return mailAddr; } /** * 获得邮件主题 * * @return * @throws MessagingException */ public String getSubject() throws MessagingException { String subject = ""; try { System.out.println("转换前的subject:" + mimeMessage.getSubject()); subject = MimeUtility.decodeText(mimeMessage.getSubject()); System.out.println("转换后的subject:" + mimeMessage.getSubject()); if (subject == null) { subject = ""; } } catch (Exception exce) { exce.printStackTrace(); } return subject; } /** * 获得邮件发送日期 * * @return * @throws Exception */ public String getSentDate() throws Exception { Date sentDate = mimeMessage.getSentDate(); System.out.println("发送日期原始类型:" + dateFormat); SimpleDateFormat format = new SimpleDateFormat(dateFormat); String strSentDate = format.format(sentDate); System.out.println("发送日期可读类型:" + strSentDate); return strSentDate; } /** * 获得邮件正文内容 * * @return */ 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 * * @param part * @throws Exception */ public void getMailContent(Part part) throws Exception { String contentType = part.getContentType(); //获得邮件的MimeType类型 System.out.println("邮件的MimeType类型:" + contentType); int nameIndex = contentType.indexOf("name"); boolean conName = false; if (nameIndex != -1) { conName = true; } System.out.println("邮件内容的类型: " + contentType); if (part.isMimeType("text/plain") && conName == false) { //text/plain类型 bodyText.append((String) part.getContent()); } else if (part.isMimeType("text/html") && conName == false) { //text/html类型 bodyText.append((String) part.getContent()); } else if (part.isMimeType("multipart/*")) { //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")) { //message/rfc822 getMailContent((Part) part.getContent()); } else { System.out.println(""); } } /** * 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" * * @return * @throws MessagingException */ public boolean getReplySign() throws MessagingException { boolean replySign = false; String[] needReply = mimeMessage.getHeader("Disposition-Notification-To"); if (needReply != null) { replySign = true; } if (replySign) { System.out.println("该邮件需要回复"); } else { System.out.println("该邮件不需要回复"); } return replySign; } /** * 获得此邮件的Message-ID * * @return * @throws MessagingException */ public String getMessageId() throws MessagingException { String messageID = mimeMessage.getMessageID(); System.out.println("邮件ID:" + messageID); return messageID; } /** * 判断此邮件是否已读,如果未读返回false,反之返回true * * @return * @throws MessagingException */ public boolean isNew() throws MessagingException { boolean isNew = false; Flags flags = ((Message) mimeMessage).getFlags(); Flags.Flag[] flag = flags.getSystemFlags(); System.out.println("flags的长度: " + flag.length); for (int i = 0; i < flag.length; i++) { if (flag[i] == Flags.Flag.SEEN) { isNew = true; System.out.println("seenemail..."); //break; } } return isNew; } /** * 判断此邮件是否包含附件 * * @param part * @return * @throws Exception */ public 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); 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 * * @param part * @throws Exception */ 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 * * @param attachPath */ public void setAttachPath(String attachPath) { this.saveAttachPath = attachPath; } /** * 设置日期显示格式 * * @param format * @throws Exception */ public void setDateFormat(String format) throws Exception { this.dateFormat = format; } /** * 获得附件存放路径 * * @return */ public String getAttachPath() { return saveAttachPath; } /** * 真正的保存附件到指定目录里 * * @param fileName * @param in * @throws Exception */ 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("附件的保存地址: " + 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(); } } }
测试类
/** * ReceiveEmail类测试 * * @param args * @throws Exception */ public static void main(String[] args) throws Exception { // 邮件的服务器主机类型,改成你自己的 String host = "imap.****.com"; // 邮箱的账号和密码,改成你自己的 String username = "zhangsan@****.com"; String password = "*****"; Properties props = new Properties(); Session session = Session.getDefaultInstance(props, null); Store store = session.getStore("imap"); store.connect(host, username, password); Folder folder = store.getFolder("INBOX"); folder.open(Folder.READ_ONLY); Message[] message = folder.getMessages(); System.out.println("邮件数量: " + message.length); ShowMail re = null; List<ShowMail> showMailList = new ArrayList<>(); for (Message value : message) { re = new ShowMail((MimeMessage) value); String subject = re.getSubject(); if (subject.contains("官网")) { showMailList.add(re); } } System.out.println("总共包含 " + showMailList.size() + " 个邮件"); for (int i = 0; i < showMailList.size(); i++) { System.out.println("邮件 " + i + " 主题: " + showMailList.get(i).getSubject()); System.out.println("邮件 " + i + " 发送时间: " + showMailList.get(i).getSentDate()); System.out.println("邮件 " + i + " 是否需要回复: " + showMailList.get(i).getReplySign()); System.out.println("邮件 " + i + " 是否已读: " + showMailList.get(i).isNew()); System.out.println("邮件 " + i + " 是否包含附件: " + showMailList.get(i).isContainAttach((Part) message[i])); System.out.println("邮件 " + i + " 发送人地址: " + showMailList.get(i).getFrom()); System.out.println("邮件 " + i + " 收信人地址: " + showMailList.get(i).getMailAddress("to")); System.out.println("邮件 " + i + " 抄送: " + showMailList.get(i).getMailAddress("cc")); System.out.println("邮件 " + i + " 暗抄: " + showMailList.get(i).getMailAddress("bcc")); showMailList.get(i).setDateFormat("yy年MM月dd日 HH:mm"); System.out.println("邮件 " + i + " 发送时间: " + showMailList.get(i).getSentDate()); System.out.println("邮件 " + i + " 邮件ID: " + showMailList.get(i).getMessageId()); showMailList.get(i).getMailContent((Part) message[i]); System.out.println("邮件 " + i + " 正文内容: \r\n" + showMailList.get(i).getBodyText()); showMailList.get(i).saveAttachMent((Part) message[i]); } /*for (int i = 0; i < showMailList.size(); i++) { System.out.println("邮件 " + i + " 主题: " + re.getSubject()); System.out.println("邮件 " + i + " 发送时间: " + re.getSentDate()); System.out.println("邮件 " + i + " 是否需要回复: " + re.getReplySign()); System.out.println("邮件 " + i + " 是否已读: " + re.isNew()); System.out.println("邮件 " + i + " 是否包含附件: " + re.isContainAttach((Part) message[i])); System.out.println("邮件 " + i + " 发送人地址: " + re.getFrom()); System.out.println("邮件 " + i + " 收信人地址: " + re.getMailAddress("to")); System.out.println("邮件 " + i + " 抄送: " + re.getMailAddress("cc")); System.out.println("邮件 " + i + " 暗抄: " + re.getMailAddress("bcc")); re.setDateFormat("yy年MM月dd日 HH:mm"); System.out.println("邮件 " + i + " 发送时间: " + re.getSentDate()); System.out.println("邮件 " + i + " 邮件ID: " + re.getMessageId()); re.getMailContent((Part) message[i]); System.out.println("邮件 " + i + " 正文内容: \r\n" + re.getBodyText()); // re.setAttachPath("h:/123"); re.saveAttachMent((Part) message[i]); }*/ }
注意事项:
// 邮件的服务器主机类型,改成你自己的,从邮箱即可查看
String host = "imap.****.com";
// 邮箱的账号和密码,改成你自己的
String username = "zhangsan@****.com";
String password = "*****";
如果想要根据时间段来筛选:则可以在获取全量邮件之前添加筛选条件
// 以下为添加根据时间筛选邮件的条件 Calendar calendar = Calendar.getInstance(); // 搜索3天前到今天收到的的所有邮件,根据时间筛选邮件 calendar.add(Calendar.DAY_OF_MONTH, -3); // 创建ReceivedDateTerm对象,ComparisonTerm.GE(大于等于),Date类型的时间 new Date(calendar.getTimeInMillis())----(表示3天前) ReceivedDateTerm term = new ReceivedDateTerm(ComparisonTerm.GE, new Date(calendar.getTimeInMillis())); // 把时间筛选条件添加到收件箱文件夹里,得到3天前到今天的所有邮件 Message[] message = folder.search(term); // Message[] message = folder.getMessages(); 这个是获取收件箱里所有邮件
有可能出现的报错可以查看另一篇博客:【Java异常】Caused by: com.sun.mail.iap.BadCommandException: A3 BAD invalid command or parameters的解决方案
完结!