Printing Runtime exec() OutputStream to console

TheWolf picture TheWolf · Oct 14, 2010 · Viewed 79.9k times · Source

I am trying to get the OutputStream of the Process initiated by exec() to the console. How can this be done?

Here is some incomplete code:

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.Reader;

public class RuntimeTests
{
    public static void main(String[] args)
    {
        File path = new File("C:\\Dir\\Dir2");
        String command = "cmd /c dir";
        Reader rdr = null;
        PrintStream prtStrm = System.out;
        try
        {
            Runtime terminal = Runtime.getRuntime();

            OutputStream rtm = terminal.exec(command, null, path).getOutputStream();
            prtStrm = new PrintStream(rtm);
            prtStrm.println();
        } 
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }
}

Answer

Benjamin Gruenbaum picture Benjamin Gruenbaum · Aug 30, 2012

I recently ran into this problem and just wanted to mention that since java 7 the process builder api has been expanded. This problem can now be solved with:

ProcessBuilder pb = new ProcessBuilder("yourcommand");
pb.redirectOutput(Redirect.INHERIT);
pb.redirectError(Redirect.INHERIT);
Process p = pb.start();