Sorry, another Runtime.getRuntime question in jsp/tomcat

[Mr.David Shapiro]

My code works fine, but I do not want to wait until the command has completed to start showing stdout/stderr to the screen. How do I get line by line the inputstream as it happens? Second, should I and how would I use Threads for this to make this better?

    
 try {
                String line = "";
                String hostname = request.getParameter("hostname");
                Process p = null;
                p = Runtime.getRuntime().exec(new String [] {
                        "/Admin/sudo/bin/sudo.pl",
                        "-s", hostname,
                        "-l"
                });
                InputStream stdout = p.getInputStream();
                InputStream stderr = p.getErrorStream();
                InputStreamReader isrStdout = new InputStreamReader(stdout);
                InputStreamReader isrStderr = new InputStreamReader(stderr);
 
                BufferedReader brStdout = new BufferedReader(isrStdout);
                BufferedReader brStderr = new BufferedReader(isrStderr);
 
                int exitVal = p.waitFor();
 
                if (exitVal == 0 ) {
                        while ((line = brStdout.readLine()) != null) {
                                out.println(line + "<br>");
                        }
                } else {
                        out.println("<p>Error seen: ");
                        while ((line = brStdout.readLine()) != null) {
                                out.println(line + "<br>");
                        }
                        out.println("<p>stderr: ");
                        while ((line = brStderr.readLine()) != null) {
                                out.println(line + "<br>");
                        }
                }
        } catch (IOException ex) {
                out.println("<p>Exception: " + ex);
        }