pop邮件接收协议

javax.mail mail 1.4.7 package cn.tisson.testin.one.collector;

import cn.tisson.testin.model.collector.PopParam;
import cn.tisson.testin.model.collector.PopResult;

import javax.mail.;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;
import java.io.;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;

/**

• Created by wuyujing on 2018/3/12.
  */
  public class PopDriver {
  public static PopResult receive(PopParam param) {
  Properties props = new Properties();
  switch (param.getType()){
  case 0: //QQ邮箱
  props.setProperty(“mail.pop3.host”, “pop.qq.com”); // 按需要更改
  props.setProperty(“mail.pop3.port”, “995”);
  // SSL安全连接参数
  props.setProperty(“mail.pop3.socketFactory.class”, “javax.net.ssl.SSLSocketFactory”);
  props.setProperty(“mail.pop3.socketFactory.fallback”, “true”);
  props.setProperty(“mail.pop3.socketFactory.port”, “995”);
  break;
  case 1: //163邮箱
  props.setProperty(“mail.store.protocol”, “pop3”); // 协议
  props.setProperty(“mail.pop3.port”, “110”); // 端口
  props.setProperty(“mail.pop3.host”, “pop.163.com”); // pop3服务器
  break;
  default:
  throw new RuntimeException(“找不到该邮箱类型”);
  }

   Session session = Session.getDefaultInstance(props, null);
   Store store = null;
   try {
       store = session.getStore("pop3");
       store.connect(param.getUsername(), param.getPassword());  //密码需要邮箱授权的验证码
       Folder folder = store.getFolder("INBOX");
       folder.open(Folder.READ_WRITE);
       Message message[] = folder.getMessages();
       System.out.println("邮件数量:　" + message.length);
       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();
   } catch (Exception e) {
       e.printStackTrace();
   }
   return null;
  

  }
  /**

  • 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

  • @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

  • @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 www.2cto.com
  • @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; 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
    */
    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
    */
    public static String decodeText(String encodeText) throws UnsupportedEncodingException {
    if (encodeText == null || “”.equals(encodeText)) {
    return “”;
    } else {
    return MimeUtility.decodeText(encodeText);
    }
    }
    }
    原文：https://blog.csdn.net/qq_33314107/article/details/79538106