如何使用JavaMail从子文件夹中获取邮件？

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

public class JavaMailExample {
    public static void main(String[] args) {
        String host = "your-mail-server";
        String username = "your-username";
        String password = "your-password";
        String folderName = "your-subfolder";

        try {
            // 创建会话对象
            Properties props = new Properties();
            Session session = Session.getDefaultInstance(props);

            // 创建存储对象并连接到邮件服务器
            Store store = session.getStore("imap");
            store.connect(host, username, password);

            // 打开子文件夹
            Folder folder = store.getFolder(folderName);
            folder.open(Folder.READ_ONLY);

            // 获取子文件夹中的邮件
            Message[] messages = folder.getMessages();

            // 遍历邮件并处理
            for (Message message : messages) {
                // 处理邮件
                System.out.println("Subject: " + message.getSubject());
                System.out.println("From: " + message.getFrom()[0]);
                System.out.println("Text: " + message.getContent());
            }

            // 关闭连接
            folder.close(false);
            store.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}