code: public static String readFileContentToString(String filePath)
              throws IOException {
          String content = "";
          content = Files.toString(new File(filePath), Charsets.UTF_8);
          return content;
      }
docs: Read file content to string.
  
  @param filePath
  the file path
  @return the string
  @throws IOException
  Signals that an I/O exception has occurred.