1 public static Workbook create(InputStream in) throws       
 2     IOException,InvalidFormatException {  
 3         if (!in.markSupported()) {  
 4             in = new PushbackInputStream(in, 8);  
 5         }  
 6         if (POIFSFileSystem.hasPOIFSHeader(in)) {  
 7             return new HSSFWorkbook(in);  
 8         }  
 9         if (POIXMLDocument.hasOOXMLHeader(in)) {  
10             return new XSSFWorkbook(OPCPackage.open(in));  
11         }  
12         throw new IllegalArgumentException("你的excel版本目前poi解析不了");  
13     }