Help Me .....exec() InputSream

Question

Hi !
I have got a problem on my program.
I use the commande exec() to execute one of my perl scripts like this :
Process p=Runtime.getRuntime().exec(cmd,null,dir);
the script launch by the commande "cmd" runs correctly.
My problem is that i want to read continously the output of my script (the script last 15 minutes) ... but I'm not able to do this ...
I can only recove the output at the end of the script(but not continously).
my code is like this....
public class ThreadLectureSortieScript extends Thread
private InputStream out;
private TextArea sortie;
private boolean ok=true;
public ThreadLectureSortieScript(InputStream o,TextArea s)
out=o;
sortie=s;
public void run()
DataInputStream dout=new DataInputStream(out);
byte []b=new byte[1];
int n;
try
while (ok)
n=dout.read();
sortie.append(""+(char)n);
sortie.append("lll");
catch (Exception ex)
ex.printStackTrace();
public void fin()
ok=false;
thank you in advance !!!
if you have some web site that talk about this subjet ....
bye Boubou

Answer 1

try this:
import java.io.*;
public class ProcessTest {
  class MyPrinter implements Runnable {
    private InputStream in;
    private OutputStream out;
    public MyPrinter(InputStream processI, OutputStream processO) {
      in = processI;
      out = processO;
    public void run() {
      try {
        for(int bytes; (bytes = in.read()) != -1; ) out.write(bytes);                    
     out.flush();
      } catch(IOException ioe) {
     ioe.printStackTrace();
  public ProcessTest() {
    try {          
      exec(new String[] {"C://Test.bat"}, System.out, System.out);           
    } catch (IOException ioe) {
      ioe.printStackTrace();
    } catch (InterruptedException ie) {
      ie.printStackTrace();
  private int exec(String[] cmd, OutputStream out, OutputStream err) throws IOException, InterruptedException {
    Process p = Runtime.getRuntime().exec(cmd);
    Thread tout = new Thread(new MyPrinter(p.getInputStream(), out));
    tout.start();
    Thread terr = new Thread(new MyPrinter(p.getErrorStream(), err));
    terr.start();
    p.waitFor();
    tout.join();
    terr.join();     
    return p.exitValue();
  public static void main(String[] argv) {
    new ProcessTest();           
}