JavaMail 接收邮件及删除

解析读取收件箱中邮件：

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;

/**
 * @ClassName: RecipientMail
 * @Description: 查询收件箱邮件并输出，有附件则将其保存进本地路径，删除邮件测试
 *
 */
public class RecipientMail {
    public static void main(String[] args) throws Exception {
        resceive();
    }

    /**
     * @Title: resceive
     * @Description: 接收邮件，解析，保存附件，删除
     * @throws Exception
     *             void
     */
    public static void resceive() throws Exception {

        // 使用163邮箱,163的 pop3地址是　pop3.163.com,　 端口是　110　　 　　
        String port = "110"; // 端口号
        String servicePath = "pop3.163.com"; // 服务器地址

        // 准备连接服务器的会话信息
        Properties props = new Properties();
        props.setProperty("mail.store.protocol", "pop3"); // 使用pop3协议
        props.setProperty("mail.pop3.port", port); // 端口
        props.setProperty("mail.pop3.host", servicePath); // pop3服务器

        // 创建Session实例对象
        Session session = Session.getInstance(props);
        Store store = session.getStore("pop3");
        store.connect("xxx@163.com", "abc"); // 163邮箱程序登录属于第三方登录所以这里的密码是163给的授权密码而并非普通的登录密码

        // 获得收件箱
        Folder folder = store.getFolder("INBOX");
        /*
         * Folder.READ_ONLY：只读权限 Folder.READ_WRITE：可读可写（可以修改邮件的状态）
         */
        folder.open(Folder.READ_WRITE); // 打开收件箱

        // 由于POP3协议无法获知邮件的状态,所以getUnreadMessageCount得到的是收件箱的邮件总数
        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);

        // 得到收件箱中的所有邮件并且删除邮件
        deleteMessage(messages);

        // 释放资源
        folder.close(true);
        store.close();
    }

    /**
     * @Title: parseMessage
     * @Description: 解析邮件
     * @param messages
     *            要解析的邮件列表
     * @throws MessagingException
     * @throws IOException
     *             void
     */
    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, "d:\\mailTest\\" + msg.getSubject() + "_"
                        + i + "_"); // 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();

        }
    }

    /**
     * @Title: deleteMessage
     * @Description: 解析邮件
     * @param messages
     *            要解析的邮件列表
     * @throws MessagingException
     * @throws IOException
     *             void
     */
    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);

        }
    }

    /**
     * @Title: getSubject
     * @Description: 获得邮件主题
     * @param msg
     *            邮件内容
     * @return 解码后的邮件主题
     * @throws UnsupportedEncodingException
     * @throws MessagingException
     *             String
     */
    public static String getSubject(MimeMessage msg)
            throws UnsupportedEncodingException, MessagingException {
        return MimeUtility.decodeText(msg.getSubject());
    }

    /**
     * @Title: getFrom
     * @Description: 获得邮件发件人
     * @param msg
     *            邮件内容
     * @return 姓名 <Email地址>
     * @throws MessagingException
     * @throws UnsupportedEncodingException
     *             String
     */
    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;
    }

    /**
     * @Title: getReceiveAddress
     * @Description: 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
     *             String
     */
    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();
    }

    /**
     * @Title: getSentDate
     * @Description: 获得邮件发送时间
     * @param msg
     *            邮件内容
     * @param pattern
     *            日期格式
     * @return yyyy年mm月dd日 星期X HH:mm
     * @throws MessagingException
     *             String
     */
    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);
    }

    /**
     * @Title: isContainAttachment
     * @Description: 判断邮件中是否包含附件
     * @param part
     *            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
     *             boolean
     */
    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();
                boolean isHasAttachment = (disp != null && (disp
                        .equalsIgnoreCase(Part.ATTACHMENT) || disp
                        .equalsIgnoreCase(Part.INLINE)));
                if (isHasAttachment) {
                    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;
    }

    /**
     * @Title: isSeen
     * @Description: 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
     *             boolean
     */
    public static boolean isSeen(MimeMessage msg) throws MessagingException {
        return msg.getFlags().contains(Flags.Flag.SEEN);
    }

    /**
     * @Title: isReplySign
     * @Description: 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
     *             boolean
     */
    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;
    }

    /**
     * @Title: getPriority
     * @Description: 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
     *             String
     */
    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;
    }

    /**
     * @Title: getMailTextContent
     * @Description: 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
     *             void
     */
    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);
            }
        }
    }

    /**
     * @Title: saveAttachment
     * @Description: 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
     *             void
     */
    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();
                boolean isHasAttachment = (disp != null && (disp
                        .equalsIgnoreCase(Part.ATTACHMENT) || disp
                        .equalsIgnoreCase(Part.INLINE)));
                if (isHasAttachment) {
                    InputStream is = bodyPart.getInputStream();
                    saveFile(is, destDir, decodeText(bodyPart.getFileName()));
                    System.out.println("----附件："
                            + decodeText(bodyPart.getFileName()) + ","
                            + " 保存路径为" + destDir);
                } 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);
        }
    }

    /**
     * @Title: saveFile
     * @Description: 读取输入流中的数据保存至指定目录
     * @param is
     *            输入流
     * @param destDir
     *            文件存储目录
     * @param fileName
     *            文件名
     * @throws FileNotFoundException
     * @throws IOException
     *             void
     */
    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();
    }

    /**
     * @Title: decodeText
     * @Description: 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
     *             String
     */
    public static String decodeText(String encodeText)
            throws UnsupportedEncodingException {
        if (encodeText == null || "".equals(encodeText)) {
            return "";
        } else {
            return MimeUtility.decodeText(encodeText);
        }
    }
}

解析结果：

附件文件保存进本地路径：

删除测试：

参考:

https://www.cnblogs.com/huangminwen/category/909841.html

https://blog.csdn.net/xyang81/article/details/7675160