java调用linux命令并获取返回值

其实就是用java的IO流去读取文件

public static String ReadTxtFile(String strFilePath) {

    String path = strFilePath;

    String gpioValue = "";

    //打开文件
    File file = new File(path);

    //如果path是传递过来的参数，可以做一个非目录的判断
    if (file.isDirectory()) {

        Log.d(TAG, "这个目录不存在");

    } else {

        try {

            InputStream instream = new FileInputStream(file);

            if (instream != null)

            {

                InputStreamReader inputreader = new InputStreamReader(instream);

                BufferedReader buffreader = new BufferedReader(inputreader);

                String line;
                //分行读取

                while ((line = buffreader.readLine()) != null) {

                    gpioValue = line;

                }
                Log.i("gpioValue-----------", gpioValue + "==============");

                instream.close();

            }

        } catch (java.io.FileNotFoundException e) {

            Log.d(TAG, "文件目录异常或不存在");

        } catch (IOException e) {

            Log.d(TAG, e.getMessage());

        }
    }

    return gpioValue;
}