JavaMail检查邮件内容 gmail IMAP

我正在尝试阅读我的消息，我可以让它打印标题，但发件人和内容显示得很有趣。 这是我用来显示消息的代码：

   int j = message.length-1;
    for (int i=j;i>=0;i--) {
        System.out.println("Message " + (i + 1));
        System.out.println("From : " + message[i].getFrom());
        System.out.println("Subject : " + message[i].getSubject());
        try {
            System.out.println("Body: " + message[i].getContent());
        } catch (IOException ex) {
            System.out.println(ex);
        }
    }

输出如下：

 Message 1:
 From: [javax.mail.internet.InternetAddress;@175831e]
 Subject: Hello //This is correct
 Body: javax.mail.internet.MimeMultipart@15b5219

为什么这不打印出 from 语句的实际电子邮件地址？为什么它不打印出实际的正文内容？ （我只对纯文本感兴趣。）

整个代码：

import javax.mail.*;
import javax.mail.internet.*;
import javax.mail.search.*;
import java.util.*;
import com.sun.mail.imap.*;
import java.io.*;

public class MailClient {
public static void main(String[] args) {
    try {
    Properties props = new Properties();
    props.put("mail.store.protocol","imaps");

    Session session;

    session = Session.getDefaultInstance(props, null);
    Store store = session.getStore("imaps");
    store.connect("imap.gmail.com","[email protected]","password");

    IMAPFolder folder = (IMAPFolder) store.getFolder("inbox");
    folder.open(Folder.READ_ONLY);

    Flags seen = new Flags(Flags.Flag.SEEN);
    FlagTerm unseenFlagTerm = new FlagTerm(seen,false);
    Message message[] = folder.search(unseenFlagTerm); 


    int j = message.length-1;
    for (int i=j;i>=0;i--) {
        System.out.println("Message " + (i + 1));
        System.out.println("From : " + message[i].getFrom());
        System.out.println("Subject : " + message[i].getSubject());
        try {
            System.out.println("Body: " + message[i].getContent());
        } catch (IOException ex) {
            System.out.println(ex);
        }
    }    
    System.out.println(newMsg);

    folder.close(false);
    store.close();
    }
    catch (MessagingException e) {
        System.out.println("Error: " + e);
    }
}
}

Thanks!

对于纯文本和 html 消息：

String content= messages[i].getContent().toString();

对于多部分消息：

Multipart multipart = (Multipart) messages[i].getContent();

    for (int j = 0; j < multipart.getCount(); j++) {

        BodyPart bodyPart = multipart.getBodyPart(j);

        String disposition = bodyPart.getDisposition();

          if (disposition != null && (disposition.equalsIgnoreCase("ATTACHMENT"))) { // BodyPart.ATTACHMENT doesn't work for gmail
              System.out.println("Mail have some attachment");

              DataHandler handler = bodyPart.getDataHandler();
              System.out.println("file name : " + handler.getName());                                 
            }
          else { 
              System.out.println("Body: "+bodyPart.getContent());
              content= bodyPart.getContent().toString();
            }