"\ufeff"是UTF-8 BOM編碼的文件頭，代表該文件按照什么字節順序排序
調用java的工具類[
UnicodeInputStream
]即可解決這個問題
//第二個參數targetEncoding為null時在getDetectedEncoding方法中會自動檢測編碼類型
UnicodeInputStream unicodeInputStream = new UnicodeInputStream(inputStream, null);
String enc = unicodeInputStream.getDetectedEncoding();
//UnicodeInputStream內部由PushbackInputStream實現，跳過了無意義的文件頭bufferedReader = new BufferedReader(new InputStreamReader(unicodeInputStream, enc));
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