Send commands to COMMAND PROMPT

Question

Hi all,
Hope someone can help me out here. I'm doing some file formating using Java and need to send this file to DOS comand prompt to call OpenLDAP commands.
i need to do the following:
cmd.exe
c:
cd openldap
ldapadd ............. <file>
Here is my code:-
import java.io.*;
public class MyTest
implements Runnable {
final int BUF_SIZE = 1024;
private byte[] inBuffer = new byte[1024];
private byte[] errBuffer = new byte[1024];
private InputStream pInputStream;
public OutputStream pOutputStream;
public InputStream pErrorStream;
public PrintWriter outputWriter;
public Thread st;
public Process p;
public MyTest() {
try {
String[] cmd=new String[3];
cmd[0] = "C:\\WINNT\\System32\\cmd.exe";
cmd[1] = "c:";
cmd[2] = "cd openldap";
p = Runtime.getRuntime().exec("cmd.exe");
if (p == null)
System.out.println("ERROR");
pInputStream = p.getInputStream();
pOutputStream = p.getOutputStream();
pErrorStream = p.getErrorStream();
outputWriter = new PrintWriter(pOutputStream, true);
st = new Thread(this);
st.start();
System.out.println("STARTED");
catch (java.io.IOException ex) {
System.out.println("IO ERROR: " + ex.getMessage());
public static void main(String[] args) {
new MyTest();
public void run() {
try {
if (st == Thread.currentThread()) {
InputStreamReader isr = new InputStreamReader(pInputStream);
BufferedReader br = new BufferedReader(isr);
String line=null;
System.out.println("NO");
line = br.readLine();
int i = 0;
while ( line != null )
if (outputWriter != null)
outputWriter.println(line);
System.out.println(line);
line = br.readLine() ;
catch (java.io.IOException ex) {
System.out.println("IO ERROR: " + ex.getMessage() );
The result:-
STARTED
NO
Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
D:\Development\dcOpenLDAP\dcOpenLDAP>Microsoft Windows 2000 [Version 5.00.2195]
D:\Development\dcOpenLDAP\dcOpenLDAP>(C) Copyright 1985-2000 Microsoft Corp.
D:\Development\dcOpenLDAP\dcOpenLDAP>
D:\Development\dcOpenLDAP\dcOpenLDAP>D:\Development\dcOpenLDAP\dcOpenLDAP>Microsoft Windows 2000 [Version 5.00.2195]
D:\Development\dcOpenLDAP\dcOpenLDAP>
D:\Development\dcOpenLDAP\dcOpenLDAP>D:\Development\dcOpenLDAP\dcOpenLDAP>(C) Copyright 1985-2000 Microsoft Corp.
D:\Development\dcOpenLDAP\dcOpenLDAP>
D:\Development\dcOpenLDAP\dcOpenLDAP>D:\Development\dcOpenLDAP\dcOpenLDAP>
i want the stream to accept input from me say c: and then it should change the dir and so on based on the list of command i listed up front. anyone please do help. and i want to be able to process and error returned from the command prompt.
thanks.
.sakthi

Answer 1

All its standard io (i.e. stdin, stdout, stderr) operations will be redirected to the parent process through three streams (Process.getOutputStream(), Process.getInputStream(), Process.getErrorStream()). The parent process uses these streams to feed input to and get output from the subprocess.
check on
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Process.html