How to execute dos commands in java ???

[janaki112]

i need to execute a .jar file in command line using java... n i have to take the output obtained from tat file...

[horace1]

i need to execute a .jar file in command line using java... n i have to take the output obtained from tat file...

you can use the exec() method from RunTime, e.g.

// execute a child process using java exec command and get output

import java.io.*;
import java.lang.*;

public class JavaExec {

public static void main (String args[]){
  try {
     // get runtime environment and execute child process
     Runtime systemShell = Runtime.getRuntime();
     Process output = systemShell.exec("java -jar hello.jar");
     // open reader to get output from process
     BufferedReader br = new BufferedReader (new InputStreamReader(output.getInputStream()));
     String line = null;
     System.out.println("<OUTPUT/>");
      while((line = br.readLine()) != null ) 
         { System.out.println(line);  }          // display process output
     System.out.println("</OUTPUT>");
     int exitVal = output.waitFor();             // get process exit value
     System.out.println("Process Exit Value : "+ exitVal);
     }
   catch (IOException ioe){ System.err.println(ioe); }
   catch (Throwable t) { t.printStackTrace();}
}
}