"\ufeff"是UTF-8 BOM编码的文件头，代表该文件按照什么字节顺序排序
调用java的工具类[
UnicodeInputStream
]即可解决这个问题
//第二个参数targetEncoding为null时在getDetectedEncoding方法中会自动检测编码类型
UnicodeInputStream unicodeInputStream = new UnicodeInputStream(inputStream, null);
String enc = unicodeInputStream.getDetectedEncoding();
//UnicodeInputStream内部由PushbackInputStream实现，跳过了无意义的文件头bufferedReader = new BufferedReader(new InputStreamReader(unicodeInputStream, enc));
)
)
