Printing Runtime exec() OutputStream to console

user_425835 0
Viewed 88422

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();
        }
    }
}
printstream runtime.exec runtime stream java
7 Answers

I know this is a very old question, but a better alternate for the above answers would be

ProcessBuilder builder = new ProcessBuilder(command);
builder.inheritIO();
Process p = builder.start();

From the docs of ProcessBuilder.inheritIO(),

Sets the source and destination for subprocess standard I/O to be the same as those of the current Java process.

Hope this helps someone!

user_61403140
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