我正在尝试使用 SSHJ 库在我的 Amazon EC2 计算机上执行 sudo 命令（https://github.com/shikhar/sshj https://github.com/shikhar/sshj）。不幸的是，我没有收到服务器的任何响应。我确信其他非 sudo 命令可以完美执行。这是一些示例代码。

        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        sshClient.addHostKeyVerifier(new PromiscuousVerifier());
        sshClient.connect(host, 22);

        if (privateKeyFile != null) {
            // authenticate using private key file.
            PKCS8KeyFile keyFile = new PKCS8KeyFile();
            keyFile.init(privateKeyFile);
            sshClient.authPublickey(user, keyFile);
        } else {
            // Authenticate using password.
            sshClient.authPassword(user, password);
        }

        // Start a new session
        session = sshClient.startSession();
        session.allocatePTY("vt220", 80,24,0,0,Collections.<PTYMode, Integer>emptyMap());

            Command cmd = null;
                String response = null;
            try (Session session = sshClient.startSession()) {
             cmd = session.exec("sudo service riak start");
             response = IOUtils.readFully(cmd.getInputStream()).toString();
        cmd.join(timeout, timeUnit);
                } finally {
        if (cmd != null) {
            cmd.close();
        }
    }

恐怕有点猜测，但我认为你的问题是：

    // Start a new session
    session = sshClient.startSession();
    session.allocatePTY("vt220", 80,24,0,0,Collections.<PTYMode, Integer>emptyMap());

    Command cmd = null;
    String response = null;
    // your allocating a new session there
    try (Session session = sshClient.startSession()) {

         cmd = session.exec("sudo service riak start");
         response = IOUtils.readFully(cmd.getInputStream()).toString();
         cmd.join(timeout, timeUnit);
    } finally {
        if (cmd != null) 
            cmd.close();
    }

我认为，如果您只启动一个会话，在其上分配一个 PTY，然后在该会话上运行命令，您可能会感兴趣：

    session = sshClient.startSession();
    session.allocatePTY("vt220", 80,24,0,0,Collections.<PTYMode, Integer>emptyMap());
    Command cmd = session.exec("sudo service riak start");
    String response = IOUtils.readFully(cmd.getInputStream()).toString();
    cmd.join(timeout, timeUnit);