java mail 获取邮件内容以及解析邮件内容

pom依赖

　　<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>jakarta.servlet</groupId>
            <artifactId>jakarta.servlet-api</artifactId>
            <version>6.0.0</version>
        </dependency>

        <dependency>
            <groupId>jakarta.activation</groupId>
            <artifactId>jakarta.activation-api</artifactId>
            <version>2.1.2</version>
        </dependency>

        <dependency>
            <groupId>com.sun.mail</groupId>
            <artifactId>jakarta.mail</artifactId>
            <version>2.0.1</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.angus</groupId>
            <artifactId>angus-mail</artifactId>
            <version>2.0.2</version>
        </dependency>

        <dependency>
            <groupId>org.eclipse.angus</groupId>
            <artifactId>angus-activation</artifactId>
            <version>2.0.1</version>
        </dependency>

    </dependencies>

　　

 

Java 案例

package com.example.receiveemail.two;

import jakarta.mail.Address;
import jakarta.mail.BodyPart;
import jakarta.mail.Flags;
import jakarta.mail.Folder;
import jakarta.mail.Message;
import jakarta.mail.MessagingException;
import jakarta.mail.Multipart;
import jakarta.mail.Part;
import jakarta.mail.Session;
import jakarta.mail.Store;
import jakarta.mail.internet.InternetAddress;
import jakarta.mail.internet.MimeMessage;
import jakarta.mail.internet.MimeMultipart;
import jakarta.mail.internet.MimeUtility;
import jakarta.mail.search.AndTerm;
import jakarta.mail.search.DateTerm;
import jakarta.mail.search.FlagTerm;
import org.eclipse.angus.mail.imap.IMAPStore;

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.HashMap;
import java.util.Map;
import java.util.Properties;

public class StoreMail {
    final static String USER = "yl18319014845@163.com"; // 用户名
    final static String PASSWORD = "RJMFEEMNZPDDZTIP"; // 密码
    public final static String MAIL_SERVER_HOST = "imap.163.com"; // 邮箱服务器

    public static void main(String[] args) throws Exception {
        long startTime = System.currentTimeMillis();
        // 创建一个有具体连接信息的Properties对象
        Properties prop = new Properties();
        prop.setProperty("mail.debug", "true");
        prop.setProperty("mail.store.protocol", "imap");
        prop.setProperty("mail.imap.host", MAIL_SERVER_HOST);
        // 1、创建session
        Session session = Session.getInstance(prop);
        // 2、通过session得到Store对象
        Store store = session.getStore();
        // 3、连上邮件服务器
        store.connect(MAIL_SERVER_HOST, USER, PASSWORD);
        // 4、获得邮箱内的邮件夹
        Folder folder = store.getFolder("inbox");

        Map<String, String> idMap = new HashMap<String, String>();
        idMap.put("name", "abel");// 这里是一个姓名，可以随便写
        idMap.put("version", "7.26");
        idMap.put("os", "windows");
        idMap.put("os-version", "6.1");
        idMap.put("vendor", "***");// 随便写
        idMap.put("contact", "***");// 是一个邮箱
        IMAPStore imapStore = (IMAPStore) store;
        imapStore.id(idMap);
        //只读
        folder.open(Folder.READ_ONLY);
        //读写
//        folder.open(Folder.READ_WRITE);
        // 获得邮件夹Folder内的所有邮件Message对象
        //1617869155000  =====> 2021-04-08 16:05:55
        DateTerm dateTerm = new DateTerm(3, new Date()) {
            @Override
            public boolean match(Message msg) {
                try {
                    return this.date.before(msg.getSentDate());
                } catch (MessagingException e) {
                    e.printStackTrace();
                }
                return false;
            }
        };
        // FlagTerm ft = new FlagTerm(new Flags(Flags.Flag.SEEN), false); //false代表未读，true代表已读
        FlagTerm flagTerm = new FlagTerm(new Flags(Flags.Flag.SEEN), true);
//        FlagTerm flagTerm = new FlagTerm(new Flags(Flags.Flag.USER), true);
        AndTerm andTerm = new AndTerm(dateTerm, flagTerm);
        Message[] search = folder.search(andTerm);
        //根据条件过滤
        Message[] messages = folder.getMessages();
//        Message[] messages = folder.getMessages();
        // 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);
            //设置当前邮件状态为已读
//            msg.setFlag(Flags.Flag.SEEN, true);
            StringBuffer content = new StringBuffer(30);
            getMailTextContent(msg, content);
//            System.out.println("邮件正文：" + content);
//            System.out.println("------------------第" + msg.getMessageNumber() + "封邮件解析结束-------------------- ");
//            System.out.println();

        }
        // 5、关闭
        folder.close(true);
        store.close();

        System.out.println("耗时：" + (System.currentTimeMillis() - startTime) + "ms");
    }

    /**
     * 删除邮件
     *
     * @param messages 要解析的邮件列表
     */
    public static void deleteMessage(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++) {

            /**
             *   邮件删除
             */
            Message message = messages[i];
            String subject = message.getSubject();
            // set the DELETE flag to true
            message.setFlag(Flags.Flag.DELETED, true);
//            System.out.println("Marked DELETE for message: " + subject);


        }
    }

    /**
     * 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
     *
     * @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; 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);
        }
    }
}