邮件发送与接收，支持163邮箱、outlook邮箱、exchange邮箱

邮件发送与接收，支持163邮箱、outlook邮箱、exchange邮箱

依赖的jar包

邮件收发公共服务层实现

package com.example.demo.service.impl;

import com.example.demo.model.EmailMessageBO;
import com.example.demo.model.EmailSendBO;
import com.example.demo.model.FileBean;
import com.example.demo.service.EmailCommonService;
import lombok.extern.slf4j.Slf4j;
import microsoft.exchange.webservices.data.core.ExchangeService;
import microsoft.exchange.webservices.data.core.PropertySet;
import microsoft.exchange.webservices.data.core.enumeration.misc.ExchangeVersion;
import microsoft.exchange.webservices.data.core.enumeration.property.WellKnownFolderName;
import microsoft.exchange.webservices.data.core.enumeration.search.LogicalOperator;
import microsoft.exchange.webservices.data.core.enumeration.search.SortDirection;
import microsoft.exchange.webservices.data.core.exception.service.local.ServiceLocalException;
import microsoft.exchange.webservices.data.core.service.item.EmailMessage;
import microsoft.exchange.webservices.data.core.service.item.Item;
import microsoft.exchange.webservices.data.core.service.schema.EmailMessageSchema;
import microsoft.exchange.webservices.data.core.service.schema.ItemSchema;
import microsoft.exchange.webservices.data.credential.ExchangeCredentials;
import microsoft.exchange.webservices.data.credential.WebCredentials;
import microsoft.exchange.webservices.data.property.complex.Attachment;
import microsoft.exchange.webservices.data.property.complex.FileAttachment;
import microsoft.exchange.webservices.data.property.complex.MessageBody;
import microsoft.exchange.webservices.data.search.FindItemsResults;
import microsoft.exchange.webservices.data.search.ItemView;
import microsoft.exchange.webservices.data.search.filter.SearchFilter;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.URLDataSource;
import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
import javax.mail.*;
import javax.mail.internet.*;
import javax.mail.search.AndTerm;
import javax.mail.search.ComparisonTerm;
import javax.mail.search.SearchTerm;
import javax.mail.search.SentDateTerm;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.*;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.*;

/**
 * @className: EmailCommonServiceImpl
 * @description: 邮件公共服务层
 * @author: wangzb01
 * @version: V1.0
 * @since: V1.0
 * @className: 2020-12-18 8:56
 */
@Slf4j
@Service
public class EmailCommonServiceImpl implements EmailCommonService {

    /**
     * @param user      邮箱地址
     * @param password  邮箱密码
     * @param emailType 邮箱类型
     * @return void
     * @description 发邮件-适用163邮箱、outlook邮箱、exchange邮箱
     * @author wangzb01
     * @date 2020-12-16 15:19
     */
    @Override
    public List<EmailMessageBO> receive(String user, String password, String emailType) {
        try {
            if ("163".equals(emailType)) {
                return receiveEmail163(user, password);
            } else if ("outlook".equals(emailType)) {
                return receiveEmailOutlook(user, password);
            } else if ("exchange".equals(emailType)) {
                return receiveEmailExchange(user, password);
            } else {
                return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
            log.error("邮件接收异常。。。");
            return null;
        }
    }

    @Override
    public void send(EmailSendBO emailSendBO) {
        if ("163".equals(emailSendBO.getEmailType())) {
            this.sendEmail163(emailSendBO);
        } else if ("outlook".equals(emailSendBO.getEmailType())) {
            this.sendEmailOutlook(emailSendBO);
        } else if ("exchange".equals(emailSendBO.getEmailType())) {
            this.sendEmailExchange(emailSendBO);
        }
    }

    /**
     * @param user
     * @param password
     * @return java.util.List<com.kbao.kbcassist.common.bean.EmailInfoBean>
     * @description 163邮箱收件箱
     * @author wangzb01
     * @date 2020-12-16 15:14
     */
    private List<EmailMessageBO> receiveEmail163(String user, String password) throws Exception {
        // 准备连接服务器的会话信息
        Properties props = System.getProperties();
        String protocol = "pop3s";
        props.setProperty("mail.store.protocol", protocol);
        props.setProperty("mail.pop3s.host", "pop.163.com");
        props.setProperty("mail.pop3s.port", "995");
        props.setProperty("mail.pop3s.auth", "true");
        props.setProperty("mail.pop3s.ssl.trust", "*");
        props.setProperty("mail.pop3s.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        // 创建Session实例对象
        Session session = Session.getInstance(props);
        Store store = session.getStore(protocol);
        // 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
        store.connect(user, password);
        // 获得收件箱
        Folder inbox = 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）
        inbox.open(Folder.READ_ONLY);

        // 搜索当天的邮件,得到收件箱中的所有邮件,并解析
        SearchTerm comparisonTermGe = new SentDateTerm(ComparisonTerm.GE, this.getDayStart());
        SearchTerm comparisonTermLe = new SentDateTerm(ComparisonTerm.LE, this.getDayEnd());
        SearchTerm comparisonAndTerm = new AndTerm(comparisonTermGe, comparisonTermLe);
        Message[] messages = inbox.search(comparisonAndTerm);
        // 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
        log.debug("未读邮件数: " + inbox.getUnreadMessageCount());
        // 获得收件箱中的邮件总数
        log.debug("邮件总数: " + inbox.getMessageCount());
        // 解析邮件消息体
        List<EmailMessageBO> emailMessageBOList = 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
        inbox.close(true);
        store.close();
        return emailMessageBOList;
    }

    /**
     * @param
     * @return java.util.Date
     * @description 获取当天开始时间
     * @author wangzb01
     * @date 2020-12-23 10:33
     */
    private Date getDayStart() {
        Calendar calendar = new GregorianCalendar();
        calendar.add(Calendar.DAY_OF_MONTH, 0);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        Date dayStart = calendar.getTime();
        return dayStart;
    }

    /**
     * @param
     * @return java.util.Date
     * @description 获取当天结束时间
     * @author wangzb01
     * @date 2020-12-23 10:33
     */
    private Date getDayEnd() {
        Calendar calendar = new GregorianCalendar();
        calendar.add(Calendar.DAY_OF_MONTH, 0);
        calendar.set(Calendar.HOUR_OF_DAY, 23);
        calendar.set(Calendar.MINUTE, 59);
        calendar.set(Calendar.SECOND, 59);
        calendar.set(Calendar.MILLISECOND, 999);
        Date dayEnd = calendar.getTime();
        return dayEnd;
    }

    /**
     * @param user
     * @param password
     * @return java.util.List<com.kbao.kbcassist.common.bean.EmailInfoBean>
     * @description outlook邮箱收件箱
     * @author wangzb01
     * @date 2020-12-16 15:18
     */
    private List<EmailMessageBO> receiveEmailOutlook(String user, String password) throws Exception {
        // 准备连接服务器的会话信息
        Properties props = System.getProperties();
        String protocol = "imap";
        props.setProperty("mail.store.protocol", protocol);
        props.setProperty("mail.imap.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        //如果我们希望JavaMail只处理SSL的连接, 对于非SSL的连接不做处理, 那么我们最好设置fallback为false
        props.setProperty("mail.imap.socketFactory.fallback", "false");
        props.setProperty("mail.imap.port", "993");
        props.setProperty("mail.imap.socketFactory.port", "993");
        props.setProperty("mail.imap.host", "outlook.office365.com");
        // 创建Session实例对象
        Session session = Session.getInstance(props);
        Store store = session.getStore(protocol);
        // 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
        store.connect(user, password);
        // 获得收件箱
        Folder inbox = 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）
        inbox.open(Folder.READ_ONLY);

        // 搜索当天的邮件,得到收件箱中的所有邮件,并解析
        SearchTerm comparisonTermGe = new SentDateTerm(ComparisonTerm.GE, this.getDayStart());
        SearchTerm comparisonTermLe = new SentDateTerm(ComparisonTerm.LE, this.getDayEnd());
        SearchTerm comparisonAndTerm = new AndTerm(comparisonTermGe, comparisonTermLe);
        Message[] messages = inbox.search(comparisonAndTerm);
        // 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
        log.debug("未读邮件数: " + inbox.getUnreadMessageCount());
        // 获得收件箱中的邮件总数
        log.debug("邮件总数: " + inbox.getMessageCount());
        // 解析邮件消息体
        List<EmailMessageBO> emailMessageBOList = 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
        inbox.close(true);
        store.close();
        return emailMessageBOList;
    }

    /**
     * @param user
     * @param password
     * @return java.util.List<com.kbao.kbcassist.common.bean.EmailInfoBean>
     * @description exchange邮箱收件箱
     * @author wangzb01
     * @date 2020-12-16 16:54
     */
    private List<EmailMessageBO> receiveEmailExchange(String user, String password) throws Exception {
        //登录的账号和密码，账号一定是可以登录进去的账号，不一定是邮箱地址
        ExchangeService service = getExchangeService(user, password, null);
        // 连接收件箱 Bind to the Inbox. 绑定收件箱,同样可以绑定发件箱
        microsoft.exchange.webservices.data.core.service.folder.Folder inbox = microsoft.exchange.webservices.data.core.service.folder.Folder.bind(service, WellKnownFolderName.Inbox);
        int unreadCount = inbox.getUnreadCount();
        log.debug("未读邮件数：" + unreadCount);
        int totalCount = inbox.getTotalCount();
        log.debug("邮件总数：" + totalCount);
        // 循环获取邮件数量
        ItemView view = new ItemView(10);
        //按照时间顺序收取
        view.getOrderBy().add(ItemSchema.DateTimeReceived, SortDirection.Descending);

        // 搜索条件，搜索当天的邮件
        SearchFilter.SearchFilterCollection sf = new SearchFilter.SearchFilterCollection(
                LogicalOperator.And,
                new SearchFilter.IsGreaterThan(EmailMessageSchema.DateTimeReceived, this.getDayStart()),
                new SearchFilter.IsLessThan(EmailMessageSchema.DateTimeReceived, this.getDayEnd())
        );

        FindItemsResults<Item> findResults = service.findItems(inbox.getId(), sf, view);
        service.loadPropertiesForItems(findResults, PropertySet.FirstClassProperties);
        List<EmailMessageBO> emailMessageBOList = new ArrayList<>();
        for (Item item : findResults.getItems()) {
            log.debug("------------------exchange邮箱邮件解析开始---------------------");
            EmailMessage msg = (EmailMessage) item;
            EmailMessageBO emailMessageBO = new EmailMessageBO();
            emailMessageBO.setMessageId(msg.getInternetMessageId());
            emailMessageBO.setSubject(msg.getSubject());
            emailMessageBO.setFrom(msg.getFrom().getAddress());
            emailMessageBO.setSentDate(getSentDate(msg.getDateTimeSent()));
            emailMessageBO.setContent(msg.getBody().toString());
            emailMessageBO.setRecipient(msg.getReceivedBy().getAddress());
            emailMessageBO.setSeen(msg.getIsRead());
            emailMessageBO.setHaveAttachment(msg.getHasAttachments());

            // 处理附件
            List<Attachment> attachmentList = msg.getAttachments().getItems();
            try {
                if (msg.getHasAttachments()) {
                    List<FileBean> fileBeanList = new ArrayList<>();
                    for (Attachment attachment : attachmentList) {
                        if (attachment instanceof FileAttachment) {
                            //接收邮件到临时目录
                            log.debug("解析exchange邮箱收件箱附件名称：{}", attachment.getName());
                            log.debug("----------解析exchange邮箱收件箱附件 并上传到阿里云OSS 开始----------");
                            File tempFile = new File(attachment.getName());
                            ((FileAttachment) attachment).load(tempFile.getPath());
                            // TODO 文件转文件流上传到阿里云OSS
                            FileBean fileBean = new FileBean();
                            fileBean.setFileName(attachment.getName());
                            fileBean.setFileUrl(tempFile.getAbsolutePath());
                            fileBeanList.add(fileBean);
                            // 删除临时存储文件
                            tempFile.delete();
                            log.debug("----------解析exchange邮箱收件箱附件 并上传到阿里云OSS 结束----------");
                        }
                    }
                    emailMessageBO.setFileBeanList(fileBeanList);
                    //删除邮件
                    //mail.delete(DeleteMode.HardDelete);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            emailMessageBOList.add(emailMessageBO);
            log.debug("------------------exchange邮箱邮件解析结束---------------------");


        }
        return emailMessageBOList;
    }


    /**
     * @param messages
     * @return java.util.List<com.kbao.kbcassist.email.model.EmailMessageBO>
     * @description 解析邮箱消息体列表
     * @author wangzb01
     * @date 2020-12-18 17:46
     */
    private List<EmailMessageBO> 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
        List<EmailMessageBO> emailMessageBOList = new ArrayList<>();
        for (int i = 0, count = messages.length; i < count; i++) {
            MimeMessage msg = (MimeMessage) messages[i];
            //Start Content-type = text/html
            if (msg.isMimeType("text/*")) {
                log.debug("------------------解析第" + msg.getMessageNumber() + "封邮件开始---------------------");
                EmailMessageBO emailMessageBO = new EmailMessageBO();
                emailMessageBO.setMessageId(msg.getMessageID());
                emailMessageBO.setSubject(getSubject(msg));
                emailMessageBO.setFrom(getFrom(msg));
                emailMessageBO.setSentDate(getSentDate(msg.getSentDate()));
                String content = msg.getContent().toString();
                emailMessageBO.setContent(content);
                emailMessageBO.setRecipient(getReceiveAddress(msg, null));
                emailMessageBO.setSeen(isSeen(msg));
                // 是否包含附件
                boolean haveAttachment = haveAttachment(msg);
                emailMessageBO.setHaveAttachment(haveAttachment);
                if (haveAttachment) {
                    // 附件转成流传递存储
                    List<FileBean> fileBeanList = this.parseEmailFile(msg);
                    emailMessageBO.setFileBeanList(fileBeanList);
                }
                emailMessageBOList.add(emailMessageBO);
                System.out.println(emailMessageBO);
                log.debug("------------------解析第" + msg.getMessageNumber() + "封邮件结束---------------------");
            } else if (msg.isMimeType("multipart/*")) {
                log.debug("------------------解析第" + msg.getMessageNumber() + "封邮件开始---------------------");
                EmailMessageBO emailMessageBO = new EmailMessageBO();
                emailMessageBO.setMessageId(msg.getMessageID());
                emailMessageBO.setSubject(getSubject(msg));
                emailMessageBO.setFrom(getFrom(msg));
                emailMessageBO.setSentDate(getSentDate(msg.getSentDate()));
                MimeMultipart part = (MimeMultipart) msg.getContent();
                BodyPart body = null;
                for (int j = 0; j < part.getCount(); j++) {
                    body = part.getBodyPart(j);
                    if (body.isMimeType("text / *")) {
                        String content = body.getContent().toString();
                        emailMessageBO.setContent(content);
                        emailMessageBO.setRecipient(getReceiveAddress(msg, null));
                        emailMessageBO.setSeen(isSeen(msg));
                        // 是否包含附件
                        boolean haveAttachment = haveAttachment(msg);
                        emailMessageBO.setHaveAttachment(haveAttachment);
                        if (haveAttachment) {
                            // 附件转成流传递存储
                            List<FileBean> fileBeanList = this.parseEmailFile(msg);
                            emailMessageBO.setFileBeanList(fileBeanList);
                        }
                        emailMessageBOList.add(emailMessageBO);
                        System.out.println(emailMessageBO);
                    }
                }
                log.debug("------------------解析第" + msg.getMessageNumber() + "封邮件结束---------------------");
            }


        }
        return emailMessageBOList;
    }


    /**
     * @param messages
     * @return void
     * @description 解析邮件并删除
     * @author wangzb01
     * @date 2020-12-18 17:37
     */
    private void deleteMessage(Message... messages) throws MessagingException {
        if (messages == null || messages.length < 1) {
            throw new MessagingException("未找到要解析的邮件!");
        }
        // 解析所有邮件，并删除
        for (Message message : messages) {
            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
     */
    private String getSubject(MimeMessage msg) throws UnsupportedEncodingException, MessagingException {
        return MimeUtility.decodeText(msg.getSubject());
    }

    /**
     * @param msg 邮件消息体
     * @return java.lang.String
     * @description 获取收件人邮箱
     * @author wangzb01
     * @date 2020-12-18 17:42
     */
    private String getFrom(MimeMessage msg) throws MessagingException {
        String from = "";
        Address[] addresses = msg.getFrom();
        if (addresses.length < 1) {
            throw new MessagingException("没有发件人!");
        }
        InternetAddress address = (InternetAddress) addresses[0];
        from = 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
     */
    private 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 date 邮件时间
     * @return LocalDateTime
     * @throws MessagingException
     */
    private LocalDateTime getSentDate(Date date) {
        if (date == null) {
            return null;
        }
        Instant instant = date.toInstant();
        ZoneId zoneId = ZoneId.systemDefault();
        return instant.atZone(zoneId).toLocalDateTime();
    }

    /**
     * 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
     */
    private boolean haveAttachment(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 = haveAttachment(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 = haveAttachment((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
     */
    private 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
     */
    private 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
     */
    private 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
     */
    private 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);
            }
        }
    }

    /**
     * @param part
     * @return java.util.List<com.kbao.kbcassist.common.sub.OssFileMsg>
     * @description 解析163、exchange邮箱附件并上传到OSS上存储
     * @author wangzb01
     * @date 2020-12-18 17:20
     */
    private List<FileBean> parseEmailFile(Part part) throws MessagingException, IOException {
        List<FileBean> fileBeanList = new ArrayList<>();
        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))) {
                    this.getEmailFileUploadOss(fileBeanList, bodyPart);
                } else if (bodyPart.isMimeType("multipart/*")) {
                    this.parseEmailFile(bodyPart);
                } else {
                    String contentType = bodyPart.getContentType();
                    if (contentType.indexOf("name") != -1 || contentType.indexOf("application") != -1) {
                        this.getEmailFileUploadOss(fileBeanList, bodyPart);
                    }
                }
            }
        } else if (part.isMimeType("message/rfc822")) {
            this.parseEmailFile((Part) part.getContent());
        }
        return fileBeanList;
    }

    /**
     * @param fileBeanList
     * @param bodyPart
     * @return void
     * @description 解析163、outlook收件箱附件 并上传到阿里云OSS
     * @author wangzb01
     * @date 2020-12-18 17:28
     */
    private void getEmailFileUploadOss(List<FileBean> fileBeanList, BodyPart bodyPart) throws MessagingException, IOException {
        log.debug("解析163、outlook收件箱附件名称：{}", decodeText(bodyPart.getFileName()));
        log.debug("----------解析163、outlook收件箱附件 并上传到阿里云OSS 开始----------");
        // TODO 附件流文件上传到阿里云OSS
        FileBean fileBean = new FileBean();
        fileBean.setFileName(decodeText(bodyPart.getFileName()));
        fileBean.setFileUrl("阿里云OSS文件访问路径");
        fileBeanList.add(fileBean);
        log.debug("----------解析163、outlook收件箱附件 并上传到阿里云OSS 结束----------");
    }


    /**
     * 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
     */
    private String decodeText(String encodeText) throws UnsupportedEncodingException {
        if (encodeText == null || "".equals(encodeText)) {
            return "";
        } else {
            return MimeUtility.decodeText(encodeText);
        }
    }


    /**
     * @param user     账号
     * @param password 密码
     * @param domain   认证信息，可不填
     * @return microsoft.exchange.webservices.data.core.ExchangeService
     * @description 创建exchange邮箱服务
     * @author wangzb01
     * @date 2020-12-15 16:46
     */
    private ExchangeService getExchangeService(String user, String password, String domain) {
        ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);
        //用户认证信息
        ExchangeCredentials credentials;
        if (domain == null) {
            credentials = new WebCredentials(user, password);
        } else {
            credentials = new WebCredentials(user, password, domain);
        }
        service.setCredentials(credentials);
        try {
            service.setUrl(new URI("https://outlook.sos.eu/ews/exchange.asmx"));
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
        return service;
    }

    /**
     * @param content
     * @return java.lang.String
     * @description 邮件HTML格式转纯文本
     * @author wangzb01
     * @date 2020-12-15 17:19
     */
    private String getContentFromHtml(String content) {
        content = content.replaceAll("</?[^>]+>", ""); //剔出<html>的标签
        content = content.replaceAll("<a>\\s*|\t|\r|\n</a>", "");
        content = content.replaceAll("&nbsp;", "");
        content = content.replaceAll("\n", "");
        return content;
    }


    /**
     * @param emailSendBO
     * @return void
     * @description 163邮箱发邮件
     * @author wangzb01
     * @date 2020-12-16 17:07
     */
    private void sendEmail163(EmailSendBO emailSendBO) {
        // 不同邮箱对应不同的服务器协议地址和端口号
        String smtpHost = "smtp.163.com";
        String popPort = "25";
        final Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.host", smtpHost);
        props.put("mail.store.protocol", "smtp");
        props.put("mail.smtp.port", popPort);
        //开启SSL
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.socketFactory.port", popPort);
        props.put("mail.smtp.socketFactory.fallback", "false");
        try {
            Session session = Session.getDefaultInstance(props, new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    // 账号密码验证
                    return new PasswordAuthentication(emailSendBO.getFrom(), emailSendBO.getPassword());
                }
            });
            session.setDebug(true);
            // 创建邮件消息
            MimeMessage message = new MimeMessage(session);
            // 设置发件人
            InternetAddress form = new InternetAddress(emailSendBO.getFrom());
            message.setFrom(form);
            // 设置收件人
            InternetAddress toAddress = new InternetAddress(emailSendBO.getRecipient());
            message.setRecipient(Message.RecipientType.TO, toAddress);
            //抄送人
            if (StringUtils.isNotBlank(emailSendBO.getRecipientCc())) {
                InternetAddress recipientCC = new InternetAddress(emailSendBO.getRecipientCc());
                message.setRecipient(Message.RecipientType.CC, recipientCC);
            }
            // 设置邮件标题
            message.setSubject(emailSendBO.getSubject());
            // 是否带附件发送
            if (!emailSendBO.getFileBeanList().isEmpty()) {
                // 创建多重消息
                Multipart multipart = new MimeMultipart();
                // 创建普通消息部分
                BodyPart messageBodyPart = new MimeBodyPart();
                messageBodyPart.setText(emailSendBO.getContent());
                // 设置多重消息的文本消息部分
                multipart.addBodyPart(messageBodyPart);
                // 设置邮件内容体
                for (FileBean fileBean : emailSendBO.getFileBeanList()) {
                    // 发送多个附件部分
                    MimeBodyPart mimeBodyPart = new MimeBodyPart();
                    // 设置附件源文件URL
                    URL url = new URL(fileBean.getFileUrl());
                    DataSource source = new URLDataSource(url);
                    mimeBodyPart.setDataHandler(new DataHandler(source));
                    // 设置附件名称
                    mimeBodyPart.setFileName(MimeUtility.encodeText(fileBean.getFileName()));
                    multipart.addBodyPart(mimeBodyPart);
                }
                // 设置最终的邮件
                message.setContent(multipart);
            } else {
                // 设置邮件的内容体
                message.setContent(emailSendBO.getContent(), "text/html;charset=UTF-8");
            }

            // 发送邮件
            Transport.send(message);
        } catch (Exception e) {
            e.printStackTrace();
            log.error("发送邮件异常：{}", e.getMessage());
        }

    }

    /**
     * @param emailSendBO
     * @return void
     * @description outlook邮箱发邮件
     * @author wangzb01
     * @date 2020-12-16 17:08
     */
    private void sendEmailOutlook(EmailSendBO emailSendBO) {
        // 不同邮箱对应不同的服务器协议地址和端口号
        String smtpHost = "smtp-mail.outlook.com";
        String popPort = "587";
        final Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.host", smtpHost);
        props.put("mail.store.protocol", "smtp");
        props.put("mail.smtp.port", popPort);
        //开启SSL
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.socketFactory.port", popPort);
        props.put("mail.smtp.socketFactory.fallback", "false");
        try {
            Session session = Session.getDefaultInstance(props, new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    // 账号密码验证
                    return new PasswordAuthentication(emailSendBO.getFrom(), emailSendBO.getPassword());
                }
            });
            session.setDebug(true);
            // 创建邮件消息
            MimeMessage message = new MimeMessage(session);
            // 设置发件人
            InternetAddress form = new InternetAddress(emailSendBO.getFrom());
            message.setFrom(form);
            // 设置收件人
            InternetAddress toAddress = new InternetAddress(emailSendBO.getRecipient());
            message.setRecipient(Message.RecipientType.TO, toAddress);
            //抄送人
            if (StringUtils.isNotBlank(emailSendBO.getRecipientCc())) {
                InternetAddress recipientCC = new InternetAddress(emailSendBO.getRecipientCc());
                message.setRecipient(Message.RecipientType.CC, recipientCC);
            }
            // 设置邮件标题
            message.setSubject(emailSendBO.getSubject());
            // 是否带附件发送
            if (!emailSendBO.getFileBeanList().isEmpty()) {
                // 创建多重消息
                Multipart multipart = new MimeMultipart();
                // 创建普通消息部分
                BodyPart messageBodyPart = new MimeBodyPart();
                messageBodyPart.setText(emailSendBO.getContent());
                // 设置多重消息的文本消息部分
                multipart.addBodyPart(messageBodyPart);
                // 设置邮件内容体
                for (FileBean fileBean : emailSendBO.getFileBeanList()) {
                    // 发送多个附件部分
                    MimeBodyPart mimeBodyPart = new MimeBodyPart();
                    // 设置附件源文件URL
                    try {
                        URL url = new URL(fileBean.getFileUrl());
                        url.openStream();
                        DataSource source = new URLDataSource(url);
                        mimeBodyPart.setDataHandler(new DataHandler(source));
                        // 设置附件名称
                        mimeBodyPart.setFileName(MimeUtility.encodeText(fileBean.getFileName()));
                        multipart.addBodyPart(mimeBodyPart);
                    } catch (IOException e) {
                        log.info("有问题的邮件附件");
                        e.printStackTrace();
                    }
                }
                // 设置最终的邮件
                message.setContent(multipart);
            } else {
                // 设置邮件的内容体
                message.setContent(emailSendBO.getContent(), "text/html;charset=UTF-8");
            }
            // 发送邮件
            Transport.send(message);
        } catch (Exception e) {
            e.printStackTrace();
            log.error("发送邮件异常：{}", e.getMessage());
        }
    }

    /**
     * @param emailSendBO
     * @return void
     * @description exchange邮箱发邮件
     * @author wangzb01
     * @date 2020-12-16 16:55
     */
    private void sendEmailExchange(EmailSendBO emailSendBO) {
        // Exchange服务器版本。
        ExchangeService exchangeService = new ExchangeService(ExchangeVersion.Exchange2010);

        // 要在MS Exchange服务器上签名的凭据。
        ExchangeCredentials exchangeCredentials = new WebCredentials(emailSendBO.getFrom(), emailSendBO.getPassword(), null);
        exchangeService.setCredentials(exchangeCredentials);

        // 邮箱的exchange web服务的URL
        try {
            exchangeService.setUrl(new URI("https://outlook.sos.eu/ews/exchange.asmx"));
        } catch (URISyntaxException ex) {
            log.error("创建与服务端的连接发生异常", ex);
            if (exchangeService != null) {
                exchangeService.close();
            }
        }

        // 设置邮件信息
        EmailMessage emailMessage = null;
        try {
            emailMessage = new EmailMessage(exchangeService);
            emailMessage.setSubject(emailSendBO.getSubject());
            emailMessage.setBody(MessageBody.getMessageBodyFromText(emailSendBO.getContent()));
        } catch (Exception ex) {
            log.error("设置邮件发生异常", ex);
        }

        // 设置收件人
        try {
            emailMessage.getToRecipients().add(emailSendBO.getRecipient());
        } catch (ServiceLocalException ex) {
            log.error("设置邮件收件人发生异常.", ex);
        }

        // 设置抄送人
//        for (String recipient : recipientCc) {
//            try {
//                emailMessage.getCcRecipients().add(recipient);
//            } catch (ServiceLocalException ex) {
//                log.error("设置邮件抄送人发生异常.", ex);
//            }
//        }

        // 设置邮件密送人
//        for (String recipient : recipientBcc) {
//            try {
//                emailMessage.getBccRecipients().add(recipient);
//            } catch (ServiceLocalException ex) {
//                log.error("设置邮件密送人发生异常.", ex);
//            }
//        }

        // 设置附件
        if (!emailSendBO.getFileBeanList().isEmpty()) {
            for (FileBean fileBean : emailSendBO.getFileBeanList()) {
                try {
                    InputStream inputStream = this.urlToInputStream(fileBean.getFileUrl());
                    emailMessage.getAttachments().addFileAttachment(fileBean.getFileName(), inputStream);
                } catch (ServiceLocalException ex) {
                    log.error("设置邮件附件发生异常", ex);
                }
            }
        }

        try {
            emailMessage.send();
            log.info("邮件发送成功.");
        } catch (Exception ex) {
            log.error("邮件发送异常.", ex);
        }
    }

    /**
     * 通过图片url返回IO流
     *
     * @param path
     * @return
     */
    private InputStream urlToInputStream(String path) {
        URL url = null;
        InputStream is = null;
        try {
            url = new URL(path);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        try {
            //利用HttpURLConnection对象,我们可以从网络中获取网页数据.
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setDoInput(true);
            conn.connect();
            //得到网络返回的输入流
            is = conn.getInputStream();

        } catch (IOException e) {
            e.printStackTrace();
        }
        return is;
    }

}

邮件收发公共服务层接口

package com.example.demo.service;


import com.example.demo.model.EmailMessageBO;
import com.example.demo.model.EmailSendBO;

import java.util.List;

/**
 * @className: EmailCommonService
 * @description: 邮件公共服务层
 * @author: wangzb01
 * @version: V1.0
 * @since: V1.0
 * @className: 2020-12-18 8:56
 */
public interface EmailCommonService {

    /**
     * @param user      邮箱地址
     * @param password  邮箱密码
     * @param emailType 邮箱类型
     * @return java.util.List<com.kbao.kbcassist.common.bean.EmailInfoBean>
     * @description 接收邮件公共方法
     * @author wangzb01
     * @date 2020-12-18 9:34
     */
    List<EmailMessageBO> receive(String user, String password, String emailType);

    /**
     * @param emailSendBO
     * @return void
     * @description 发送邮件公共方法
     * @author wangzb01
     * @date 2020-12-23 9:33
     */
    void send(EmailSendBO emailSendBO);
}

发送邮件业务参数对象

package com.example.demo.model;

import lombok.Data;

import java.util.List;

/**
 * @className: EmailSendBO
 * @description: 发送邮件业务参数对象
 * @author: wangzb01
 * @version: V1.0
 * @since: V1.0
 * @className: 2020-12-23 9:59
 */
@Data
public class EmailSendBO {

    /**
     * 发件人
     * [e-mail]
     */
    private String from;

    /**
     * 邮箱密码
     * test
     */
    private String password;

    /**
     * 收件人
     * [e-mail];[e-mail]
     */
    private String recipient;

    /**
     * 抄送人
     * [e-mail];[e-mail]
     */
    private String recipientCc;

    /**
     * 邮件标题
     * 这是一封测试邮件
     */
    private String subject;

    /**
     * 邮件内容
     * 测试内容无需回复
     */
    private String content;

    /**
     * 邮箱类型(163邮箱,outlook邮箱,exchange邮箱)
     * outlook
     */
    private String emailType;

    /**
     * 邮件附件集合
     * 文件集合
     */
    private List<FileBean> fileBeanList;

}

文件基础对象

package com.example.demo.model;

import lombok.Data;

/**
 * @className: FileBean
 * @description: 文件基础对象
 * @author: wangzb01
 * @version: V1.0
 * @since: V1.0
 * @className: 2020-12-17 9:27
 */
@Data
public class FileBean {

    /**
     * 文件名
     * 保险公司.jpg
     */
    private String fileName;

    /**
     * 文件URL
     * https://oss-test-hd2-01.oss-cn-shanghai-finance-1.aliyuncs.com/assist_sta_uat/test/2020120709480951.jpg
     */
    private String fileUrl;

}

邮件消息体业务对象

package com.example.demo.model;

import lombok.Data;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @className: EmailMessage
 * @description: 邮件消息体业务对象
 * @author: wangzb01
 * @version: V1.0
 * @since: V1.0
 * @className: 2020-12-18 10:49
 */
@Data
public class EmailMessageBO {

    /**
     * 邮件ID
     */
    private String messageId;

    /**
     * 邮件ID
     */
    private String subject;

    /**
     * 发件人
     */
    private String from;

    /**
     * 邮件发送时间
     */
    private LocalDateTime sentDate;

    /**
     * 收件人
     */
    private String recipient;

    /**
     * 邮件正文
     */
    private String content;

    /**
     * 邮件是否已读
     */
    private Boolean seen;

    /**
     * 邮件是否包含附件
     */
    private Boolean haveAttachment;

    /**
     * 文件集合
     */
    private List<FileBean> fileBeanList;
}

本文地址：https://blog.csdn.net/flyingwzb/article/details/112677882