使用JSch分别为各个提示提供输入

问题描述：

问题在于，在常规登录后，SSH连接需要提供另一个用户ID和密码信息.

The problem is that the SSH connection requires the provision of another userid and password info after the general log in.

我正在使用JSch连接到远程服务器.它以InputStream的形式接受输入.此InputStream只能传递一次.由于会话是交互式的，因此会导致问题.

I am using JSch to connect to the remote server. It takes input in the form of a InputStream. And this InputStream can only be passed once. This causes problems as the session is interactive.

我尝试将输入流作为换行符的单独值("username\npassword\n")传递.但是，这不起作用.欢迎大家提出意见.即使我必须完全寻找一个新的Java库.

I've tried passing the input stream as linefeed separate values ("username\npassword\n"). This however does not work. Any suggestions would be welcome. Even if I have to look for a new Java library altogether.

try {
    JSch jsch=new JSch();
    Session session=jsch.getSession( "username1", "host", 22);
    session.setPassword("password1");
    session.setConfig("StrictHostKeyChecking", "no");
    session.connect(30000);
    Channel channel=session.openChannel("shell");           
    String data = "username2\npassword2\n";
    channel.setInputStream(new ByteArrayInputStream(data.getBytes()));
    channel.setOutputStream(System.out);
    channel.connect(3*1000);
} catch (Exception e) {
    e.printStackTrace();
}

密码输入错误，并且无法导航到ssh连接显示的下一组指令.

The password is not entered properly and it does not navigate to the next set of instruction displayed by the ssh connection.

但是，如果我尝试使用系统控制台(System.in)作为输入流，则它会按预期工作.

However, if I try the same with the system console (System.in) as the input stream, it works as expected.

答

如果我正确理解了您的问题，则似乎密码提供的速度过快以及服务器的实现方式，它会丢弃输入时间过早的输入(在提示之前).

If I understand your question correctly, it looks like the password is provided too quickly and the way the server is implemented, it discards the input that comes too early (before a prompt).

您可能需要等待，然后再发送密码.

You may need to wait before sending the password.

channel.connect();
OutputStream out = channel.getOutputStream();
out.write(("username2\n").getBytes());
out.flush();   
Thread.sleep(1000); 
out.write(("password2\n").getBytes());
out.flush();

更高级的解决方案是实现类似期望的功能.

A more advanced solution would be to implement an Expect-like functionality.

使用JSch分别为各个提示提供输入

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