Mediation-Backend/ruoyi-common/src/main/java/com/ruoyi/common/utils/EmailUtil.java

package com.ruoyi.common.utils;

import lombok.extern.slf4j.Slf4j;

import javax.mail.*;
import javax.mail.internet.MimeMessage;
import java.io.IOException;

@Slf4j
public final class EmailUtil {

    private static final String multipart = "multipart/*";



    public static String getMessageId(Part part, Session session) throws Exception {
         if (!part.isMimeType(multipart)) {
            return "";

        }

        Multipart multipart = (Multipart) part.getContent();
        for (int i = 0; i < multipart.getCount(); i++) {
            BodyPart bodyPart = multipart.getBodyPart(i);
            if(bodyPart.getContentType().contains("Message/Rfc822")){
                MimeMessage mimeMessage = new MimeMessage(session, bodyPart.getInputStream());
               if(mimeMessage.getSubject()!=null&&mimeMessage.getSubject().contains("调解书")){
                   String[] split = mimeMessage.getSubject().split("调解书");
                   if(split.length>0){
                       return split[0];
                   }
               }
            }
        } return "";
    }

    public static boolean isContainAttachment(Part part) {
        boolean attachFlag = false;
        try {
            if (part.isMimeType(multipart)) {
                Multipart mp = (Multipart) part.getContent();
                for (int i = 0; i < mp.getCount(); i++) {
                    BodyPart mpart = mp.getBodyPart(i);
                    String disposition = mpart.getDisposition();
                    if ((disposition != null) && ((disposition.equals(Part.ATTACHMENT)) || (disposition.equals(Part.INLINE))))
                        attachFlag = true;
                    else if (mpart.isMimeType(multipart)) {
                        attachFlag = isContainAttachment((Part) mpart);
                    } else {
                        String contype = mpart.getContentType();
                        if (contype.toLowerCase().contains("application"))
                            attachFlag = true;
                        if (contype.toLowerCase().contains("name"))
                            attachFlag = true;
                    }
                }
            } else if (part.isMimeType("message/rfc822")) {
                attachFlag = isContainAttachment((Part) part.getContent());
            }
        } catch (MessagingException | IOException e) {
            e.printStackTrace();
        }
        return attachFlag;
    }
}