springboot发邮件，javaxmail收邮件功能

import com.sun.mail.imap.IMAPFolder;
import com.sun.mail.imap.protocol.IMAPProtocol;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.util.ObjectUtils;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeUtility;
import java.io.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

public class ReceivedIMAPMail {

    public static String NORM_DATETIME_PATTERN = "yyyy-MM-dd hh:mm:ss";
    
    private MimeMessage mimeMessage;
    /**
     * 附件下载后的存放目录
     */
    private String saveAttachPath = "";
    /**
     * 存放邮件内容的StringBuffer对象
     */
    private StringBuffer bodyText = new StringBuffer();

    /**
     * 构造函数,初始化一个MimeMessage对象
     *
     * @param mimeMessage
     */
    public ReceivedIMAPMail(MimeMessage mimeMessage) {
        this.mimeMessage = mime