Help! invoke dos command!!

Question

i want to implement a notepad in java language, it can invoke a dos command(ping.exe) to some IP addresses stored in a text file, and store the ping results into a text file, how can i invoke a dos command and store the execute results into a text file???

Answer 1

If you want to execute an external ping command and collect the result, it can be done by using the Runtime class. Runtime's exec method returns a Process supplying you with an input stream containing the ping result. You must make sure to read the output on the go (to avoid blocking the entire process).
Here's an outline:
import java.io.*;
public class Ping {
    public static void main(String args[]) {
        try {           
            String[] cmd = { "ping.exe", "time.nist.gov" }; // Command and argument
            Process process = Runtime.getRuntime().exec(cmd); // Execute command
            // Read output - in separate thread
            streamReader sr = new streamReader( process.getInputStream() );
            sr.start();
            process.waitFor(); // Wait until process has terminated
        } catch (Exception e) {
            System.err.println(e);
class streamReader extends Thread { // Read input stream (new thread)
    InputStream is;
    streamReader(InputStream is) {
        this.is = is;
    public void run() {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String rline;
            while ( (rline = br.readLine()) != null)
                System.out.println(rline);   
            } catch (IOException e) {
                System.err.println(e);