code: public static String getFileContent(String filePath, String encoding)
              throws IOException {
          BufferedReader buff = new BufferedReader(new InputStreamReader(
                  new FileInputStream(filePath), encoding));
          String content = getContent(buff);
          buff.close();
          return content;
      }
docs: 按照指定编码得到文件内容
  
  @param filePath 源文件路径
  @param encoding 文件编
  @return 文件内容
  @throws IOException io exception