workflow_streamliner/src/main/java/cn/kdan/utils/EmailUtil.java

package cn.kdan.utils;

import cn.hutool.json.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.StringUtils;

import javax.mail.*;
import javax.mail.search.AndTerm;
import javax.mail.search.FromStringTerm;
import javax.mail.search.SearchTerm;
import javax.mail.search.SubjectTerm;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author ComPDF-Bob 2024-06-11
 **/
@Slf4j
public class EmailUtil {

    /**
     * 获取邮件正文
     * @param part 邮件信息
     * @return 正文
     * @throws MessagingException
     * @throws IOException
     */
    public static String getTextFromMessage(Part part) throws MessagingException, IOException {
        if (part.isMimeType("text/plain")) {
            return (String) part.getContent();
        } else if (part.isMimeType("text/html")) {
            // 如果你想要获取 HTML 内容，可以在这里处理
            return (String) part.getContent();
        } else if (part.isMimeType("multipart/*")) {
            Multipart multipart = (Multipart) part.getContent();
            StringBuilder result = new StringBuilder();
            for (int i = 0; i < multipart.getCount(); i++) {
                BodyPart bodyPart = multipart.getBodyPart(i);
                String partText = getTextFromMessage(bodyPart);
                if (partText != null && !partText.isEmpty()) {
                    result.append(partText);
                }
            }
            return result.toString();
        } else if (part.isMimeType("message/rfc822")) {
            // 如果 MIME 类型是 "message/rfc822"，这意味着嵌套的邮件
            return getTextFromMessage((Part) part.getContent());
        }
        return "";
    }

    /**
     * 从邮件正文中提取目标邮箱地址
     *
     * @param body 邮件正文
     * @return 目标邮箱地址
     */
    public static String extractTargetEmail(String body) {
        Pattern pattern = Pattern.compile("([\\w.-]+@[\\w.-]+\\.[\\w]+)");
        Matcher matcher = pattern.matcher(body);
        if (matcher.find()) {
            return matcher.group(1);
        }
        return "";
    }
}