How to run dos batch file from java program

[James Ajewole]

Hi,
How can i run a dos batch command from a java program. For example i want to run a dos batch file after executing a java program, and i want to initiate the dos batch command from the java program. thanks
james

[John Ipe]

  
Runtime rt = Runtime.getRuntime();
rt.exec("cmd.exe /c <batch file name>");

what did you mean by "initiate the dos batch command"?
regards

[John Ipe]

if you mean you want to pass parameters to the batch file from the java pgm, you could append those as Strings after the batch file name:

  
rt.exec("cmd.exe /c mybatchfile.bat" + " " + param1 + " " + param2);

and your batch file would read param1 and param2 with %1 and %2 respectively. is this what you needed?
regards

[James Ajewole]

thanks john, i'll try out the command.

[James Ajewole]

hi john,
unfortunately it didnt work. I tried to execute a simple bat file to echo something but i never saw anything echoed on the screen.

[Ernest Friedman-Hill]

It won't go to the screen. It will go to the process's standard output, which is available from the Process object created by Runtime.exec(). You call getInputStream() on the Process, and, if you want, you read data out of the InputStream and display it on the console; something like

Process p = ...
BufferedReader reader =
     new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;
while ((line = reader.readLine()) != null)
  System.out.println(line);
reader.close();