获取163邮箱的邮件 并下载附件

package ltg.helper; 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 { /** * 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 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"; 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 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 - 1; 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