错误：读取电子邮件内容时出现 javax.mail.internet.MimeMultipart

Question

我有以下代码可以使用 Java 阅读 Gmail 电子邮件。如果电子邮件包含非常简单的纯文本消息，则代码运行良好，我可以看到（正文）的内容正确显示。

但是，对于某些电子邮件，我在尝试时看到以下消息

显示正文（内容：javax.mail.internet.MimeMultipart@2038ae61）

. 我发现很难解决这个问题。请帮我。

代码 ：

import java.util.Properties;

import javax.activation.DataHandler;
import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.internet.MimeMultipart;

public class Experiment {
    public static void main(String[] args) {
        Properties props = new Properties();
        props.setProperty("mail.store.protocol", "imaps");
        try {
            Session session = Session.getInstance(props, null);
            Store store = session.getStore();
            store.connect("imap.gmail.com", "username@gmail.com",
                    "password");
            Folder inbox = store.getFolder("INBOX");
            inbox.open(Folder.READ_ONLY);
            Message msg = inbox.getMessage(inbox.getMessageCount());
            Address[] in = msg.getFrom();
            for (Address address : in) {
                System.out.println("FROM:" + address.toString());
            }

            // showContent(msg);


            Multipart mp = (Multipart) msg.getContent();
            BodyPart bp = mp.getBodyPart(0);
            System.out.println("SENT DATE:" + msg.getSentDate());
            System.out.println("SUBJECT:" + msg.getSubject());
            System.out.println("CONTENT:" + bp.getContent());


        } catch (Exception mex) {
            mex.printStackTrace();
        }
    }

Answer 1

这对我有用

  String contentType = msg.getContentType();
    String messageContent="";

   if (contentType.contains("multipart")) {
        Multipart multiPart = (Multipart) message.getContent();
        int numberOfParts = multiPart.getCount();
        for (int partCount = 0; partCount < numberOfParts; partCount++) {
            MimeBodyPart part = (MimeBodyPart) multiPart.getBodyPart(partCount);
                messageContent = part.getContent().toString();
        }
    }
    else if (contentType.contains("text/plain")
            || contentType.contains("text/html")) {
        Object content = message.getContent();
        if (content != null) {
            messageContent = content.toString();
        }
    }
     System.out.println(" Message: " + messageContent);