修复了issue#2324 文件不是默认编码格式时出现乱码或者报错的情况 #2499
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FileReader不能指定文件读取格式,只能按默认格式读取,所以在读取不是默认格式的CSV文件时会出现乱码或报错,因此采用new InputStreamReader(new FileInputStream())来读取文件,指定读取文件的格式