如何在Google App engine (Java)中使用IMAP

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

public class IMAPExample {
    public static void main(String[] args) {
        // 配置IMAP服务器连接信息
        String host = "imap.example.com";
        int port = 993;
        String username = "your_username";
        String password = "your_password";

        // 设置JavaMail属性
        Properties props = new Properties();
        props.setProperty("mail.store.protocol", "imaps");
        props.setProperty("mail.imaps.host", host);
        props.setProperty("mail.imaps.port", String.valueOf(port));

        try {
            // 创建会话
            Session session = Session.getInstance(props, null);

            // 连接到IMAP服务器
            Store store = session.getStore();
            store.connect(host, port, username, password);

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

            // 获取邮件数量
            int messageCount = inbox.getMessageCount();
            System.out.println("Total Messages: " + messageCount);

            // 遍历邮件并打印主题
            Message[] messages = inbox.getMessages();
            for (Message message : messages) {
                System.out.println("Subject: " + message.getSubject());
            }

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