NPO兼容xlsx 和xls 微軟和金山都可用

 在導入Excel的時候，儘量能判斷導入Excel的版本，調用不同的方法。

   HSSFWorkbook  對應xls 版本

   XSSFWorkbook  對應xlsx 版本

   Workbook wb = WorkbookFactory.create(is);//自動兼容版本

/**
     * Creates the appropriate HSSFWorkbook / XSSFWorkbook from
     *  the given InputStream.
     * Your input stream MUST either support mark/reset, or
     *  be wrapped as a {@link PushbackInputStream}!
     */
    public static Workbook create(InputStream inp) throws IOException, InvalidFormatException {
        // If clearly doesn't do mark/reset, wrap up
        if(! inp.markSupported()) {
            inp = new PushbackInputStream(inp, 8);
        }
        
        if(POIFSFileSystem.hasPOIFSHeader(inp)) {
            return new HSSFWorkbook(inp);
        }
        if(POIXMLDocument.hasOOXMLHeader(inp)) {
            return new XSSFWorkbook(OPCPackage.open(inp));
        }
        throw new IllegalArgumentException("Your InputStream was neither an OLE2 stream, nor an OOXML stream");
    }

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