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);

        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;

}