POI 解析Excel

The supplied data appears to be in the Office 2007+ XML. 
You are calling the part of POI that deals with OLE2 Office Documents. 
You need to call a different part of POI to process this data (eg XSSF instead of HSSF).

// 1.  2007及以上版本使用
Workbook  workbook1 = new XSSFWorkbook(inputStream);     
// 2 . 2003及以下版本使用 
Workbook  workbook2 = new HSSFWorkbook(inputStream);     
// 3.  不区分版本
Workbook wb = WorkbookFactory.create(inputStream);

方式 3 实现了根据版本去选择相应的解析类：
	    /**
    	 * 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");
    	}