linux下：
String[] command = { "/bin/sh", "-c", cmmd };
Process ps = Runtime.getRuntime().exec(command );
windows下：
String[] command = { "cmd", "/c", cmmd };
Process ps = Runtime.getRuntime().exec(command );
linux下：
String[] command = { "/bin/sh", "-c", cmmd };
Process ps = Runtime.getRuntime().exec(command );
windows下：
String[] command = { "cmd", "/c", cmmd };
Process ps = Runtime.getRuntime().exec(command );