Solved

How to run external program in java?

Posted on 2004-10-11
5
245 Views
Last Modified: 2010-03-31
I try to run sqlldrin my java code. I wrote a small to test if exec is working. The code is as following:

try {
      System.out.println("Starting");
      Process p = Runtime.getRuntime().exec("ping 127.0.0.1");
      p.waitFor();
      if ( p.exitValue() ==0)
      {
           System.out.println("done");
      }
}catch (IOException ioe){
     System.out.println(ioe);
}catch (InterruptedException ie){
     System.out.println(ie);
}

It doesn't work. It seems it will stop there forever.I run it on Windows 2000. Please help me figure out why?

Thanks.

0
Comment
Question by:jen2483
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 4

Accepted Solution

by:
JK2429 earned 500 total points
ID: 12279462
0
 
LVL 8

Expert Comment

by:kiranhk
ID: 12279639
Check out this link
http://www.idevelopment.info/data/Programming/java/PROGRAMMING_Java_Programming.shtml

in that check out Running External OS Commands


the following is the program from the site which u can use


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/*
 * Created on Oct 11, 2004
 *
 */

public class TestCode {

    public static void main(String[] args) {
       
        String s = null;

        try {
           
            // run the Unix "ps -ef" command
           
            Process p = Runtime.getRuntime().exec("ping localhost");
           
            BufferedReader stdInput = new BufferedReader(new
                 InputStreamReader(p.getInputStream()));

            BufferedReader stdError = new BufferedReader(new
                 InputStreamReader(p.getErrorStream()));

            // read the output from the command
           
            System.out.println("Here is the standard output of the command:\n");
            while ((s = stdInput.readLine()) != null) {
                System.out.println(s);
            }
           
            // read any errors from the attempted command

            System.out.println("Here is the standard error of the command (if any):\n");
            while ((s = stdError.readLine()) != null) {
                System.out.println(s);
            }
           
            System.exit(0);

        } catch (IOException e) {
            System.out.println("[IOException]. Printing Stack Trace");
            e.printStackTrace();
            System.exit(-1);
        }        
    }
}
0
 
LVL 30

Expert Comment

by:GrandSchtroumpf
ID: 12279730
it works fine on my XP machine
0
 
LVL 30

Expert Comment

by:GrandSchtroumpf
ID: 12279809
this is a version i found in my archives that echoes the output of the ping:

import java.io.*;

class ProcessReadOut {
  public static void main(String[] args) {
    try {
      String command  = "ping localhost";
      Runtime rt = Runtime.getRuntime();
      Process p = rt.exec(command);
      InputStream in = p.getInputStream();
      InputStreamReader inReader = new InputStreamReader(in);
      BufferedReader bInReader = new BufferedReader(inReader);
      String currRead;
      while ((currRead = bInReader.readLine()) != null) {
        System.out.println("from java -> " + currRead);
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}
0
 
LVL 92

Expert Comment

by:objects
ID: 12283260
there's also an example of reading exec() output at:

http://www.objects.com.au/java/examples/util/ConsoleExec.do
0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

After being asked a question last year, I went into one of my moods where I did some research and code just for the fun and learning of it all.  Subsequently, from this journey, I put together this article on "Range Searching Using Visual Basic.NET …
In this post we will learn different types of Android Layout and some basics of an Android App.
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question