java获取linux主机名

/**
     * <获取主机名>
     *
     * @return 主机名
     * @throws
     */
    public static String getHostname()
    {
        String command = "hostname";
        Reader reader = null;
        BufferedReader bufferedReader = null;
        InputStream inputStream = null;
        List<String> cmdOutput = new ArrayList<>();
        String line = null;
        String hostname = null;
        try
        {
            Process process = Runtime.getRuntime().exec(command);
            inputStream = process.getInputStream();
            reader = new InputStreamReader(inputStream);
            bufferedReader = new BufferedReader(reader);

            while ((line = bufferedReader.readLine()) != null)
            {
                cmdOutput.add(line);
            }
            LOGGER.info("cmdOutput is {}", cmdOutput);
            if (null != cmdOutput && cmdOutput.size() > 0)
            {
                hostname = cmdOutput.get(0).replaceAll(" ", "");
            }

            process.waitFor();

            return hostname;
        }
        catch (Exception ex)
        {
            LOGGER.error("get hostname error. cause:", ex);
            return null;
        }
        finally
        {
            try
            {
                if (null != inputStream)
                {
                    inputStream.close();
                }
                if (null != reader)
                {
                    reader.close();
                }
                if (null != bufferedReader)
                {
                    bufferedReader.close();
                }
            }
            catch (IOException e)
            {
                LOGGER.error("close inputstream error. cause:", e);
            }
        }
    }