求助

Question

我要用JAVA POI 插一张图片到已有图片的EXCEL里 
但是图片是插入了，原先EXCEL里的图片确不见了，EXCEL里还有CHECKBOX也不见了，求助各位 
代码： 
            String excelFileName = "D:/bb.xls"; 
      String pictureFileName = "D:/aa.jpg"; 
      FileInputStream  file = new FileInputStream(excelFileName); 
      HSSFWorkbook wb = new HSSFWorkbook(file); 
      
      ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream(); 
      BufferedImage bufferImg = ImageIO.read(new File(pictureFileName)); 
      ImageIO.write(bufferImg, "JPG", byteArrayOut); 
      HSSFClientAnchor anchor = new HSSFClientAnchor(0,0, 512, 255,(short) 1, 37, (short) 4, 47); 
      HSSFPatriarch patri = wb.getSheetAt(0).createDrawingPatriarch(); 
      patri.createPicture(anchor, wb.addPicture(byteArrayOut 
                .toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG)); 
      FileOutputStream outStream = new FileOutputStream(excelFileName _out); 
      wb.write(outStream);