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Posted By

bcmoney on 08/17/12


Tagged

system commands


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ExecuteSystemCommand.java

 / Published in: Java
 

WARNING: Don't use this one lightly, you can run just about any command the JVM has access to and could corrupt data or bring your system crashing to a halt. Certainly do not recommend putting this behind a user-accessible front-end such as a Web Form, Servlet or GUI control without intense scrutiny, validation and filtering of the inputs.

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  1. import java.io.*;
  2.  
  3. /**
  4.  * ExecuteSystemCommand.java
  5.  *   Runs any command from the Operating System command-line.
  6.  */
  7.  
  8. public class ExecuteSystemCommand {
  9.  
  10. 	public void ExecuteSystemCommand() {
  11.  
  12. 	}
  13.  
  14. 	public String run(String cmdLine) { 
  15. 	    String line;
  16. 	    String output = "";
  17. 	    try {
  18. 	        Process p = Runtime.getRuntime().exec(cmdLine);
  19. 	        BufferedReader input = new BufferedReader
  20. 	            (new InputStreamReader(p.getInputStream()));
  21. 	        while ((line = input.readLine()) != null) {
  22. 	            output += (line + '\n');
  23. 	        }
  24. 	        input.close();
  25. 	        }
  26. 	    catch (Exception ex) {
  27. 	        ex.printStackTrace();
  28. 	    }
  29. 	    return output;
  30.   }
  31.  
  32.   public static void main(String[] args) {
  33.       ExecuteSystemCommand cmd = new ExecuteSystemCommand();
  34.       //CAREFUL HERE!!!!!!!!!!!
  35.       System.out.println(cmd.run("ls -a"));
  36.   }
  37. }

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