如何使用JavaMail接口读取电子邮件附件(当contentType为文本/纯文本时)

import javax.mail.*;
import javax.mail.internet.*;
import java.util.Properties;

public class ReadEmailAttachments {
    public static void main(String[] args) {
        // 邮件服务器配置
        String host = "your_mail_server";
        String username = "your_username";
        String password = "your_password";

        // 创建Properties对象，设置邮件服务器配置
        Properties props = new Properties();
        props.setProperty("mail.smtp.host", host);
        props.setProperty("mail.smtp.auth", "true");

        try {
            // 创建Session对象
            Session session = Session.getInstance(props, new Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(username, password);
                }
            });

            // 连接到邮件服务器
            Store store = session.getStore("pop3");
            store.connect(host, username, password);

            // 打开收件箱
            Folder inbox = store.getFolder("INBOX");
            inbox.open(Folder.READ_ONLY);

            // 获取邮件
            Message[] messages = inbox.getMessages();

            // 遍历邮件
            for (Message message : messages) {
                // 获取邮件主题、发件人、发送日期等信息
                String subject = message.getSubject();
                String from = InternetAddress.toString(message.getFrom());
                String sentDate = message.getSentDate().toString();

                // 处理附件
                if (message.isMimeType("text/plain")) {
                    // 获取文本内容
                    String content = message.getContent().toString();
                    System.out.println("Subject: " + subject);
                    System.out.println("From: " + from);
                    System.out.println("Sent Date: " + sentDate);
                    System.out.println("Content: " + content);
                } else if (message.isMimeType("multipart/*")) {
                    // 获取Multipart对象
                    Multipart multipart = (Multipart) message.getContent();

                    // 遍历各个BodyPart对象
                    for (int i = 0; i < multipart.getCount(); i++) {
                        BodyPart bodyPart = multipart.getBodyPart(i);

                        // 处理文本类型的BodyPart对象
                        if (bodyPart.isMimeType("text/plain")) {
                            String content = bodyPart.getContent().toString();
                            System.out.println("Subject: " + subject);
                            System.out.println("From: " + from);
                            System.out.println("Sent Date: " + sentDate);
                            System.out.println("Content: " + content);
                        }

                        // 处理附件类型的BodyPart对象
                        if (bodyPart.getDisposition() != null && bodyPart.getDisposition().equalsIgnoreCase(Part.ATTACHMENT)) {
                            String fileName = bodyPart.getFileName();
                            bodyPart.saveFile("path_to_save_attachments/" + fileName);
                            System.out.println("Attachment saved: " + fileName);
                        }
                    }
                }
            }

            // 关闭邮件夹和邮件服务器连接
            inbox.close(false);
            store.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}