code: public void readLines(LineHandler lineHandler) throws IORuntimeException{
  		BufferedReader reader = null;
  		try {
  			reader = FileUtil.getReader(file, charset);
  			IoUtil.readLines(reader, lineHandler);
  		} finally {
  			IoUtil.close(reader);
  		}
  	}
docs: 按照行处理文件内容
  
  @param lineHandler 行处理器
  @throws IORuntimeException IO异常
  @since 3.0.9