JavaMail学习笔记（四）使用POP3协议接收并解析电子邮件
来源：互联网 发布：it资产管理系统源码 编辑：程序博客网 时间：2024/06/11 19:18
- package org.yangxin.study.jm;
- 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.text.SimpleDateFormat;
- import java.util.Date;
- import java.util.Properties;
- 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.Store;
- import javax.mail.internet.InternetAddress;
- import javax.mail.internet.MimeMessage;
- import javax.mail.internet.MimeMultipart;
- import javax.mail.internet.MimeUtility;
- /**
- * 使用POP3协议接收邮件
- */
- public class POP3ReceiveMailTest {
- public staticvoid main(String[] args) throws Exception {
- receive();
- }
- /**
- * 接收邮件
- */
- public staticvoid receive() throws Exception {
- // 准备连接服务器的会话信息
- Properties props = new Properties();
- props.setProperty("mail.store.protocol","pop3"); // 协议
- props.setProperty("mail.pop3.port","110"); // 端口
- props.setProperty("mail.pop3.host","pop3.163.com"); // pop3服务器
- // 创建Session实例对象
- Session session = Session.getInstance(props);
- Store store = session.getStore("pop3");
- store.connect("xyang0917@163.com","123456abc");
- // 获得收件箱
- Folder folder = store.getFolder("INBOX");
- /* Folder.READ_ONLY：只读权限
- * Folder.READ_WRITE：可读可写（可以修改邮件的状态）
- */
- folder.open(Folder.READ_WRITE); //打开收件箱
- // 由于POP3协议无法获知邮件的状态,所以getUnreadMessageCount得到的是收件箱的邮件总数
- System.out.println("未读邮件数: " + folder.getUnreadMessageCount());
- // 由于POP3协议无法获知邮件的状态,所以下面得到的结果始终都是为0
- System.out.println("删除邮件数: " + folder.getDeletedMessageCount());
- System.out.println("新邮件: " + folder.getNewMessageCount());
- // 获得收件箱中的邮件总数
- System.out.println("邮件总数: " + folder.getMessageCount());
- // 得到收件箱中的所有邮件,并解析
- Message[] messages = folder.getMessages();
- parseMessage(messages);
- //释放资源
- folder.close(true);
- store.close();
- }
- /**
- * 解析邮件
- * @param messages 要解析的邮件列表
- */
- public staticvoid 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];
- System.out.println("------------------解析第" + msg.getMessageNumber() +"封邮件-------------------- ");
- System.out.println("主题: " + getSubject(msg));
- System.out.println("发件人: " + getFrom(msg));
- System.out.println("收件人：" + getReceiveAddress(msg,null));
- System.out.println("发送时间：" + getSentDate(msg,null));
- System.out.println("是否已读：" + isSeen(msg));
- System.out.println("邮件优先级：" + getPriority(msg));
- System.out.println("是否需要回执：" + isReplySign(msg));
- System.out.println("邮件大小：" + msg.getSize() *1024 + "kb");
- boolean isContainerAttachment = isContainAttachment(msg);
- System.out.println("是否包含附件：" + isContainerAttachment);
- if (isContainerAttachment) {
- saveAttachment(msg, "c:\\mailtmp\\"+msg.getSubject() + "_");//保存附件
- }
- StringBuffer content = new StringBuffer(30);
- getMailTextContent(msg, content);
- System.out.println("邮件正文：" + (content.length() >100 ? content.substring(0,100) +"..." : content));
- System.out.println("------------------第" + msg.getMessageNumber() +"封邮件解析结束-------------------- ");
- System.out.println();
- }
- }
- /**
- * 获得邮件主题
- * @param msg 邮件内容
- * @return 解码后的邮件主题
- */
- public static String getSubject(MimeMessage msg)throws UnsupportedEncodingException, MessagingException {
- return MimeUtility.decodeText(msg.getSubject());
- }
- /**
- * 获得邮件发件人
- * @param msg 邮件内容
- * @return 姓名 <Email地址>
- * @throws MessagingException
- * @throws UnsupportedEncodingException
- */
- public static String getFrom(MimeMessage msg)throws MessagingException, UnsupportedEncodingException {
- String from = "";
- Address[] froms = msg.getFrom();
- if (froms.length < 1)
- throw new MessagingException("没有发件人!");
- InternetAddress address = (InternetAddress) froms[0];
- String person = address.getPersonal();
- if (person != null) {
- person = MimeUtility.decodeText(person) + " ";
- } else {
- person = "";
- }
- from = person + "<" + address.getAddress() +">";
- return from;
- }
- /**
- * 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
- */
- public static 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();
- }
- /**
- * 获得邮件发送时间
- * @param msg 邮件内容
- * @return yyyy年mm月dd日 星期X HH:mm
- * @throws MessagingException
- */
- public static String getSentDate(MimeMessage msg, String pattern)throws MessagingException {
- Date receivedDate = msg.getSentDate();
- if (receivedDate == null)
- return "";
- if (pattern == null || "".equals(pattern))
- pattern = "yyyy年MM月dd日 E HH:mm ";
- return new SimpleDateFormat(pattern).format(receivedDate);
- }
- /**
- * 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
- */
- public staticboolean 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;
- }
- /**
- * 判断邮件是否已读
- * @param msg 邮件内容
- * @return 如果邮件已读返回true,否则返回false
- * @throws MessagingException
- */
- public staticboolean isSeen(MimeMessage msg) throws MessagingException {
- return msg.getFlags().contains(Flags.Flag.SEEN);
- }
- /**
- * 判断邮件是否需要阅读回执
- * @param msg 邮件内容
- * @return 需要回执返回true,否则返回false
- * @throws MessagingException
- */
- public staticboolean isReplySign(MimeMessage msg) throws MessagingException {
- boolean replySign = false;
- String[] headers = msg.getHeader("Disposition-Notification-To");
- if (headers != null)
- replySign = true;
- return replySign;
- }
- /**
- * 获得邮件的优先级
- * @param msg 邮件内容
- * @return 1(High):紧急 3:普通(Normal) 5:低(Low)
- * @throws MessagingException
- */
- public static String getPriority(MimeMessage msg)throws MessagingException {
- String priority = "普通";
- String[] headers = msg.getHeader("X-Priority");
- if (headers != null) {
- String headerPriority = headers[0];
- if (headerPriority.indexOf("1") != -1 || headerPriority.indexOf("High") != -1)
- priority = "紧急";
- else if (headerPriority.indexOf("5") != -1 || headerPriority.indexOf("Low") != -1)
- priority = "低";
- else
- priority = "普通";
- }
- return priority;
- }
- /**
- * 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 staticvoid 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);
- }
- }
- }
- /**
- * 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
- */
- public staticvoid saveAttachment(Part part, String destDir)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();
- saveFile(is, destDir, decodeText(bodyPart.getFileName()));
- } else if (bodyPart.isMimeType("multipart/*")) {
- saveAttachment(bodyPart,destDir);
- } else {
- String contentType = bodyPart.getContentType();
- if (contentType.indexOf("name") != -1 || contentType.indexOf("application") != -1) {
- saveFile(bodyPart.getInputStream(), destDir, decodeText(bodyPart.getFileName()));
- }
- }
- }
- } else if (part.isMimeType("message/rfc822")) {
- saveAttachment((Part) part.getContent(),destDir);
- }
- }
- /**
- * 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 staticvoid saveFile(InputStream is, String destDir, String fileName)
- throws FileNotFoundException, IOException {
- BufferedInputStream bis = new BufferedInputStream(is);
- BufferedOutputStream bos = new BufferedOutputStream(
- new FileOutputStream(new File(destDir + fileName)));
- 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
- */
- public static String decodeText(String encodeText)throws UnsupportedEncodingException {
- if (encodeText == null ||"".equals(encodeText)) {
- return "";
- } else {
- return MimeUtility.decodeText(encodeText);
- }
- }
- }
测试结果：
- JavaMail学习笔记（四）、使用POP3协议接收并解析电子邮件（全）
- JavaMail学习笔记（四）、使用POP3协议接收并解析电子邮件
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- JavaMail学习笔记（五）使用IMAP协议接收并解析电子邮件
- 使用POP3协议接收并解析电子邮件（全）
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