Unable to read entire header; 80 bytes read; expected 512 bytes

做了一个上传excel表格的功能，老是报这个错误，这个错误找了大半天了，最后的解决方式也很简单

“expected 512 bytes将读取您的前512个字节，Inputstream并在没有足够的字节读取时抛出异常。认为您的文件不够大，无法被POI阅读。”

可以修改一下excel格式或者把xls改成xlsx都行，
亲测有效！！！

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Unable to read entire header; 80 bytes read; expected 512 bytes

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