1，邮箱协议设置

1，邮箱的读取需要先配置邮箱协议，主要有两种，第一个是pop3协议，第二个是imap协议，两者之间的区别在于imap是可以区分邮件是否已读取，而pop可以通过SearchTerm查询条件过滤邮件，关于两者的配置QQ邮箱可以直接点下方QQ官方链接设置，
https://service.mail.qq.com/cgi-bin/help?subtype=1&&id=28&&no=1001256

2，腾讯企业邮箱到不需要配置，因为他默认是已经开启了pop3、imap协议的，可以直接通过账号以及密码登录连接的，但是你也可以配置专用密码进行连接，方法如下图
1，开启前

2，开启后

2，java代码实现

1，两者之前的代码实际上都差不多，区别在于邮箱服务器的配置

imap
1，QQ邮箱服务器：imap.qq.com
2，腾讯企业邮箱服务器：imap.exmail.qq.com
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pop
1,QQ邮箱服务器：pop.qq.com
2,腾讯企业邮箱服务器：pop.exmail.qq.com
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//涉及pom jar
<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.7</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.12.0</version>
</dependency>
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package com.example.demo.utils;

import org.apache.commons.lang3.StringUtils;

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;

/**
 * @author:Deng
 * @date: 2021-04-14 17:30
 * @remark:  腾讯邮件读取
 */
public class EmailUtils {

    public static void readEmail() {
        Properties props = new Properties();
        props.put("mail.imap.host", "imap.exmail.qq.com");//QQ邮箱为：imap.qq.com
        props.put("mail.imap.auth", "true");
        props.setProperty("mail.store.protocol", "imap");
        props.put("mail.imap.starttls.enable", "true");
        Session session = Session.getInstance(props);
        try {
            Store store = session.getStore();
             //企业邮箱如果开启了安全登录，密码需要使用专用密码，没有开启使用账号密码即可
           store.connect("imap.exmail.qq.com", "xxx@xx.com", "xxxxx");
           //store.connect("imap.qq.com", "xxx@xx.com", "授权码");//QQ邮箱需要设置授权码
            Folder folder = store.getFolder("Inbox");
            //邮箱打开方式
            folder.open(Folder.READ_WRITE);
            //收取未读邮件
            Message[] messages = folder.getMessages(folder.getMessageCount() - folder.getUnreadMessageCount() + 1, folder.getMessageCount());

            System.out.println("邮件总数: " + folder.getMessageCount());
            //解析的邮件的方法，就粘贴了网上的了，有需要的直接点击参考文档的链接
            parseFileMessage(messages);
            folder.setFlags(messages, new Flags(Flags.Flag.SEEN), true);
        }catch (Exception e){
            System.out.println("异常： " + e);
        }
    }

  public static void readEmailPop() throws Exception {
        Properties props = new Properties();
        props.put("mail.pop3.host", "pop.exmail.qq.com");
        props.put("mail.pop3.auth", "true");
        props.setProperty("mail.store.protocol", "pop3");
        props.put("mail.pop3.starttls.enable", "true");
        Session session = Session.getInstance(props);
        Store store = session.getStore("pop3");
        store.connect("pop.exmail.qq.com", "xxx@xxx.net", "xxxx");
        Folder folder = store.getFolder("Inbox");
        //邮箱打开方式
        folder.open(Folder.READ_WRITE);
        //昨天零点时间
        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.DATE, -1);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        Date mondayDate = cal.getTime();
        //昨天零点到当前时间的邮件
        SearchTerm comparisonTermGe = new SentDateTerm(ComparisonTerm.GE, mondayDate);
        SearchTerm comparisonTermLe = new SentDateTerm(ComparisonTerm.LE, new Date());
        SearchTerm comparisonAndTerm = new AndTerm(comparisonTermGe, comparisonTermLe);
        //条件查询只能通过pop协议的方式才生效
        Message[] messages = folder.search(comparisonAndTerm);
        //  Message[] messages = folder.getMessages();
        System.out.println("读取的邮件总数: " + messages.length);
        parseFileMessage(messages);
        // folder.setFlags(messages, new Flags(Flags.Flag.SEEN), true);
        System.out.println("邮件解析任务执行完毕");
    }

    public static void parseFileMessage(Message... messages) throws Exception {
        if (messages == null || messages.length < 1){
            System.out.println("没有可读取邮件");
            return;
        }
        // 解析读取到的邮件
        for (Message message : messages) {
            MimeMessage msg = (MimeMessage) message;
            System.out.println("------------------解析第" + msg.getMessageNumber() + "封邮件-------------------- ");
            System.out.println("主题: " + MimeUtility.decodeText(msg.getSubject()));
            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");
            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();
            boolean isContainerAttachment = isContainAttachment(msg);
            System.out.println("是否包含附件：" + isContainerAttachment);
            if (isContainerAttachment) {
                saveAttachment(msg, "D:\data\emailFile\", msg.getFileName()); //保存附件
            }
            System.out.println("------------------第" + msg.getMessageNumber() + "封邮件解析结束-------------------- ");
        }
    }
    /**
     * 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;
    }
    /**
     * 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.contains("1") || headerPriority.contains("High"))
                priority = "紧急";
            else if (headerPriority.contains("5") || headerPriority.contains("Low"))
                priority = "低";
            else
                priority = "普通";
        }
        return priority;
    }
    /**
     * 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 {
        StringBuilder receiveAddress = new StringBuilder();
        Address[] addresss;
        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();
    }

    /**
     * 判断邮件中是否包含附件
     *
     * @return 存在附件返回true，不存在返回false
     */
    public static boolean isContainAttachment(Part part) throws Exception {
        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.contains("application")) {
                        flag = true;
                    }

                    if (contentType.contains("name")) {
                        flag = true;
                    }
                }

                if (flag) break;
            }
        } else if (part.isMimeType("message/rfc822")) {
            flag = isContainAttachment((Part) part.getContent());
        }
        return flag;
    }

    /**
     * 保存文件
     *
     * @param destDir  文件目录
     * @param fileName 文件名
     * @throws Exception 异常
     */
    public static void saveAttachment(Part part, String destDir, String fileName) throws Exception {
        if (part.isMimeType("multipart/*")) {
            //复杂体邮件
            Multipart multipart = (Multipart) part.getContent();
            //复杂体邮件包含多个邮件体
            int partCount = multipart.getCount();
            for (int i = 0; i < partCount; i++

                        

                        

                          

                            

                            
阅读：448 次
 日期：2021-04-24

                              

                            
                          

                            

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