java使用javamail读取邮箱（收件箱为例）

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Properties;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.MimeUtility;/** * @author yh *  */public class ShowMail {private MimeMessage mimeMessage = null;private String saveAttachPath = ""; // 附件下载后的存放目录private StringBuffer bodyText = new StringBuffer(); // 存放邮件内容的StringBuffer对象private String dateFormat = "yy-MM-dd HH:mm"; // 默认的日前显示格式/** * 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 　 */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 　 */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 　 */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 　 */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 　 */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 　　 */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/rfc822getMailContent((Part) part.getContent());} else {}}/** * 　　*　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[] = 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 　　 */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 */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("seen email...");// break;}}return isNew;}/** * 判断此邮件是否包含附件 */public boolean isContainAttach(Part part) throws Exception {boolean attachFlag = false;// String contentType = part.getContentType();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 　 */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 */public void setAttachPath(String attachPath) {this.saveAttachPath = attachPath;}/** * 　*　设置日期显示格式 　 */public void setDateFormat(String format) throws Exception {this.dateFormat = format;}/** * 　*　获得附件存放路径 　 */public String getAttachPath() {return saveAttachPath;}/** * 　*　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 = 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());// for(int　i=0;storefile.exists();i++){// storefile　=　new　File(storedir+separator+fileName+i);// }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();}}/** *　ReceiveEmail类测试 */public static void main(String args[]) throws Exception {String host = "pop.sina.com";String username = "***";String password = "***";Properties props = new Properties();Session session = Session.getDefaultInstance(props, null);Store store = session.getStore("pop3");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;for (int i = 0; i < message.length; i++) {re = new ShowMail((MimeMessage) message[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("e:\\");re.saveAttachMent((Part) message[i]);}}}

javamail.jar   下载链接