JavaMail学习笔记（四）、使用POP3协议接收并解析电子邮件（全）

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 static void main(String[] args) throws Exception {receive();}/** * 接收邮件 */public static void 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0System.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 static 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];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 * Message.RecipientType.TO 收件人 * Message.RecipientType.CC 抄送 * Message.RecipientType.BCC 密送 * @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 static 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;}/** * 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 static boolean 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 static boolean 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";elsepriority = "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 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);}}}/** * 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 static void 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 static void 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：

辽远或偏僻的地方，而会常常想起这一次的旅行，

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