解决异常：Package should contain a content type part [M1.13]

http://blog.csdn.net/llwan/article/details/8890190

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public static Workbook create(InputStream in) throws     
    IOException,InvalidFormatException {
        if (!in.markSupported()) {
            in = new PushbackInputStream(in, 8);
        }
        if (POIFSFileSystem.hasPOIFSHeader(in)) {
            return new HSSFWorkbook(in);
        }
        if (POIXMLDocument.hasOOXMLHeader(in)) {
            return new XSSFWorkbook(OPCPackage.open(in));
        }
        throw new IllegalArgumentException("你的excel版本目前poi解析不了");

    }

读写xls和xlsx格式时，HSSFWorkbook针对xls，XSSFWorkbook针对xlsx