In Java, send commands to another command-line program
- by bradvido
I am using Java on Windows XP and want to be able to send commands to another program such as telnet.
I do not want to simply execute another program. I want to execute it, and then send it a sequence of commands once it's running.
Here's my code of what I want to do, but it does not work:
(If you uncomment and change the command to "cmd" it works as expected. Please help.)
try
{
Runtime rt = Runtime.getRuntime();
String command = "telnet";
//command = "cmd";
Process pr = rt.exec(command);
BufferedReader processOutput = new BufferedReader(new InputStreamReader(pr.getInputStream()));
BufferedWriter processInput = new BufferedWriter(new OutputStreamWriter(pr.getOutputStream()));
String commandToSend = "open localhost\n";
//commandToSend = "dir\n" + "exit\n";
processInput.write(commandToSend);
processInput.flush();
int lineCounter = 0;
while(true)
{
String line = processOutput.readLine();
if(line == null) break;
System.out.println(++lineCounter + ": " + line);
}
processInput.close();
processOutput.close();
pr.waitFor();
}
catch(Exception x)
{
x.printStackTrace();
}
