skip the BOM of UTF-8

方法一：BufferedReader bufferedReader =new BufferedReader(new UnicodeReader(new FileInputStream(file)));

方法二：BufferedReader bufferedReader =new BufferedReader(new InputStreamReader(new BOMInputStream(new FileInputStream(file))));

以上两种方法均可解决以下字符问题：

  java.nio.charset.MalformedInputException: Input length = 1