Java API for Print, Browse, Shutdown from Simple Java Program on Windows OS

I have been working on a app which takes the commands from database and execute on a windows machine (XP,Vista & 7). Commands include browse(given a link), print (given a location) and shutdown the machine. I have utilized the Java Desktop API for solving this problem i have used this post. All you need is following three snippets:

1. Get Desktop instance:

  Desktop desktop = null;
    if (Desktop.isDesktopSupported()) {
        desktop = Desktop.getDesktop();

2. For Browse/Open file:
         File file = new File("url");
         desktop.open(file);

3. For Print file: 

         File file = new File("url");

         desktop.print(file);

3. For Shutdown file: 

Process child = Runtime.getRuntime().exec("shutdown -s");