How can one run OS commands from JSP's?

Question

Hi
I figured out the perms problem I had, and running a java class that calls Runtime.exec() now works - apparently; in fact, it doesn't really run the OS command, but returns "OK".
Anyone have an idea how to make it actually run?
Thanks,
Paulo

Answer 1

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Paulo Rodrigues ([email protected]):
Hi
I figured out the perms problem I had, and running a java class that calls Runtime.exec() now works - apparently; in fact, it doesn't really run the OS command, but returns "OK".
Anyone have an idea how to make it actually run?
Thanks,
Paulo<HR></BLOCKQUOTE>
Hi Paulo, i use for that function the following code:
// JDC Tech Tips February 15, 2000
import java.io.*;
import java.util.ArrayList;
public class ExecDemo {
static public String[] runCommand(String cmd)
throws IOException {
// set up list to capture command output lines
ArrayList list = new ArrayList();
// start command running
Process proc = Runtime.getRuntime().exec(cmd);
// get command's output stream and
// put a buffered reader input stream on it
InputStream istr = proc.getInputStream();
BufferedReader br =
new BufferedReader(new InputStreamReader(istr));
// read output lines from command
String str;
while ((str = br.readLine()) != null)
list.add(str);
// wait for command to terminate
try {
proc.waitFor();
catch (InterruptedException e) {
System.err.println("process was interrupted");
// check its exit value
if (proc.exitValue() != 0)
System.err.println("exit value was non-zero");
// close stream
br.close();
// return list of strings to caller
return (String[])list.toArray(new String[0]);
public static void main(String args[]) throws IOException {
try {
// run a command
String outlist[] = runCommand("rm ./dummy");
// String outlist[] = runCommand("ls");
// display its output
for (int i = 0; i < outlist.length; i++)
System.out.println(outlist);
catch (IOException e) {
System.err.println(e);
Gert
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