帮我用java写一个工具类，基于imap协议监控某个人的邮件，当有新邮件收到时触发打印

好的，以下是一个简单的 Java 工具类，可以基于 IMAP 协议监控某个人的邮件，当有新邮件收到时触发打印。

import java.util.Properties;
import javax.mail.*;
import javax.mail.event.MessageCountAdapter;
import javax.mail.event.MessageCountEvent;

public class EmailMonitor {
    private String host;
    private String username;
    private String password;
    private String folder;

    public EmailMonitor(String host, String username, String password, String folder) {
        this.host = host;
        this.username = username;
        this.password = password;
        this.folder = folder;
    }

    public void start() {
        Properties props = new Properties();
        props.setProperty("mail.store.protocol", "imaps");
        props.setProperty("mail.imaps.host", host);
        props.setProperty("mail.imaps.user", username);
        props.setProperty("mail.imaps.password", password);

        try {
            Session session = Session.getInstance(props);
            Store store = session.getStore();
            store.connect();
            Folder inbox = store.getFolder(folder);
            inbox.open(Folder.READ_ONLY);

            inbox.addMessageCountListener(new MessageCountAdapter() {
                @Override
                public void messagesAdded(MessageCountEvent event) {
                    Message[] messages = event.getMessages();
                    for (Message message : messages) {
                        try {
                            System.out.println("New email received from: " + message.getFrom()[0] + ", Subject: " + message.getSubject());
                        } catch (MessagingException e) {
                            e.printStackTrace();
                        }
                    }
                }
            });

            while (true) {
                Thread.sleep(1000);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        String host = "imap.gmail.com";
        String username = "your.email@gmail.com";
        String password = "yourpassword";
        String folder = "INBOX";

        EmailMonitor monitor = new EmailMonitor(host, username, password, folder);
        monitor.start();
    }
}

你需要将 `host`、`username`、`password` 和 `folder` 这四个变量替换为你自己的邮箱服务器地址、邮箱账号、密码和要监控的文件夹名称。然后就可以通过 `monitor.start()` 方法启动监控，当有新邮件到达时会触发打印。