java代码中执行liunx命令

public static String runShell(String command){

   try{

       String[] commands = isLinux()?new String[]{"/bin/sh","-c",command}:new String[]{"cmd","/c",command};

       Process process = Runtime.getRuntime().exec(commands);  

       InputStreamReader ir = new InputStreamReader(process.getInputStream());

       LineNumberReader input = new LineNumberReader(ir);

       String ln;

       StringBuilder result = new StringBuilder();

       while ((ln = input.readLine()) != null){  

           result.append(ln);

           result.append("\n");        

      }

       input.close();

       ir.close();

       return result.toString();

  }

   catch(Exception e){

       e.printStackTrace();//log

       return null;

  }

}

public static boolean isLinux(){

   String os = System.getProperty("os.name").toLowerCase();

   if(null != os && os.contains("windows")){

       return false;

  }

   return true;

}