code: public static void readLines(RandomAccessFile file, Charset charset, LineHandler lineHandler) {
  		String line = null;
  		try {
  			while ((line = file.readLine()) != null) {
  				lineHandler.handle(CharsetUtil.convert(line, CharsetUtil.CHARSET_ISO_8859_1, charset));
  			}
  		} catch (IOException e) {
  			throw new IORuntimeException(e);
  		}
  	}
docs: 按行处理文件内容
  
  @param file {@link RandomAccessFile}文件
  @param charset 编码
  @param lineHandler {@link LineHandler}行处理器
  @throws IORuntimeException IO异常
  @since 4.5.2