code: public static BufferedReader getReader(String path, String charsetName) throws IORuntimeException {
  		return getReader(file(path), charsetName);
  	}
docs: 获得一个文件读取器
  
  @param path 绝对路径
  @param charsetName 字符集
  @return BufferedReader对象
  @throws IORuntimeException IO异常