Jsch：命令输出不可用 [英] Jsch : Command Output unavailable

问题描述

我正在尝试使用jsch连接到远程开关并运行一些命令并提取输出。

I am trying to use jsch to connect to a remote switch and run some command and extract the output.

我可以使用连接到交换机，但输入流中没有命令输出。也许我没有以正确的方式做到这一点。这是代码

I am able to connect to the switch using , however the command output is not available in the inputstream. Maybe i am not doing it the right way. Here's the code

    session = jsch.getSession("user", "10.0.0.0", 22);
    session.setPassword("somepwd");
    session.setConfig("StrictHostKeyChecking", "no");
    session.connect();
    System.out.println("connected to remote host");
    Channel channel = session.openChannel("shell");

     OutputStream ops = channel.getOutputStream();
     PrintStream ps = new PrintStream(ops);
        channel.connect();
            ps.println("show version"); 
            ps.flush();
            ps.close();
            InputStream in=channel.getInputStream();
            byte[] bt=new byte[1024];


            while(in.available()>0)
            {
                int i=in.read(bt, 0, 1024);
                if(i<0)
                 break;
                    String str=new String(bt, 0, i);
                //displays the output of the command executed.
                    System.out.print(str);
            }

    channel.disconnect();
    session.disconnect();

当我调试inputStream.isAvailable（）时总是返回零，表明命令没有输出。

When i debug the inputStream.isAvailable() always returns zero suggesting that there is no output from the command.

TIA！

推荐答案

请尝试下面的代码 - 测试和工作

Please try the code below - tested and working

    Channel channel = session.openChannel("shell");
    OutputStream ops = channel.getOutputStream();
    PrintStream ps = new PrintStream(ops);
    channel.connect();
    ps.println("pwd");
    ps.println("exit");
    ps.flush();
    ps.close();

    InputStream in = channel.getInputStream();
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    System.out.println("Opening...");

    String jarOutput;
    while ((jarOutput = reader.readLine()) != null)
        System.out.println(jarOutput);
    reader.close();
    channel.disconnect();

输出 -

开放...

user @ host：〜> pwd

/ home / user

user @ host：〜>

user @ host：〜> exit

logout

Opening...
user@host:~> pwd
/home/user
user@host:~>
user@host:~> exit
logout

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