excel 输出图片

private static void drawPictureInfoExcel(HSSFWorkbook wb,HSSFSheet sheet, HSSFPatriarch patriarch, int colIndex, int rowIndex, String imagePath) {

   HSSFPatriarch patriarchs = sheet.createDrawingPatriarch();
   try {

      if (StringUtils.isNotBlank(imagePath)) {
         URL url = new URL(imagePath);
         //打开链接
         HttpURLConnection conn = (HttpURLConnection) url.openConnection();
         //设置请求方式为"GET"
         conn.setRequestMethod("GET");
         //超时响应时间为5秒
         conn.setConnectTimeout(5 * 1000);
         //通过输入流获取图片数据
         InputStream inStream = conn.getInputStream();
         //得到图片的二进制数据，以二进制封装得到数据，具有通用性
         byte[] data = readInputStream(inStream);
         //anchor主要用于设置图片的属性
         HSSFClientAnchor anchor = new HSSFClientAnchor(10, 0, 1023, 250, (short) colIndex, rowIndex, (short) colIndex, rowIndex);
         //Sets the anchor type （图片在单元格的位置）
         //0 = Move and size with Cells, 2 = Move but don't size with cells, 3 = Don't move or size with cells.
         anchor.setAnchorType(0);
         patriarch.createPicture(anchor, wb.addPicture(data, HSSFWorkbook.PICTURE_TYPE_JPEG));
      }
   } catch (IOException e) {
      e.printStackTrace();
   } catch (Exception e) {
      e.printStackTrace();
   }
}


private static byte[] readInputStream(InputStream inStream) throws Exception {
   ByteArrayOutputStream outStream = new ByteArrayOutputStream();
   //创建一个Buffer字符串
   byte[] buffer = new byte[1024];
   //每次读取的字符串长度，如果为-1，代表全部读取完毕
   int len = 0;
   //使用一个输入流从buffer里把数据读取出来
   while ((len = inStream.read(buffer)) != -1) {
      //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
      outStream.write(buffer, 0, len);
   }
   //关闭输入流
   inStream.close();
   //把outStream里的数据写入内存
   return outStream.toByteArray();
}