java通过堡垒机连接服务器

import com.jcraft.jsch.*;

public class SSHExample {
    public static void main(String[] args) {
        String jumpHost = "jump.example.com"; // 堡垒机地址
        String jumpPort = "22"; // 堡垒机端口
        String username = "jumpUser"; // 堡垒机用户名
        String password = "jumpPassword"; // 堡垒机密码

        String targetHost = "target.example.com"; // 目标服务器地址
        String targetPort = "22"; // 目标服务器端口
        String targetUsername = "targetUser"; // 目标服务器用户名
        String targetPassword = "targetPassword"; // 目标服务器密码

        try {
            JSch jsch = new JSch();
            Session session = jsch.getSession(username, jumpHost, Integer.parseInt(jumpPort));
            session.setPassword(password);
            session.setConfig("StrictHostKeyChecking", "no");
            session.connect();

            Channel channel = session.openChannel("ssh");
            ((ChannelSSH) channel).setPty(true);
            ((ChannelSSH) channel).setEnv("TERM", "xterm");

            ChannelExec channelExec = (ChannelExec) channel;
            channelExec.setCommand(String.format("sshpass -p '%s' ssh -o StrictHostKeyChecking=no %s@%s -p %s",
                    targetPassword, targetUsername, targetHost, targetPort));

            InputStream in = channelExec.getInputStream();
            channelExec.connect();

            byte[] tmp = new byte[1024];
            while (true) {
                while (in.available() > 0) {
                    int i = in.read(tmp, 0, 1024);
                    if (i < 0) break;
                    System.out.print(new String(tmp, 0, i));
                }
                if (channelExec.isClosed()) {
                    break;
                }
                try {
                    Thread.sleep(100);
                } catch (Exception ee) {
                }
            }

            channelExec.disconnect();
            session.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}