java Execl 写入png图片 解决

1、先拿到Execl 的所有图片 放到list

/**
     * 获取图片和位置 (xls)
     *
     * @param sheet
     * @return
     * @throws IOException
     */
    public Map<String, PictureData> getPictures(XSSFSheet sheet) throws IOException {
        Map<String, PictureData> map = new HashMap<String, PictureData>();
        XSSFDrawing drawing = sheet.getDrawingPatriarch();
        if (drawing != null) {
            List<XSSFShape> list = drawing.getShapes();//.getChildren();
            for (XSSFShape shape : list) {
                if (shape instanceof XSSFPicture) {
                    XSSFPicture picture = (XSSFPicture) shape;
                    XSSFClientAnchor cAnchor = (XSSFClientAnchor) picture.getAnchor();
                    PictureData pdata = picture.getPictureData();
                    String key = cAnchor.getRow1() + "-" + cAnchor.getCol1();
                    map.put(key, pdata);
                }
            }
        }
        return map;
    }

2、从list拿到某个图片，工具类写入图片

            PictureData pictureData = maplist.get(rowNum + "-" + index);
                if (null != pictureData) {
                    String suggestFileExtension = pictureData.suggestFileExtension();// 图片格式
                    String localPath = ResourceFileUtil.dirPath(SecurityUtils.getUserId(), "wechat/tiku/question/option/") + rowNum + "." + suggestFileExtension;// 存储路径
                    File file = new File(localPath);
                    if (!file.getParentFile().exists()) {
                        file.getParentFile().mkdirs();
                    }
                    FileUtil.writeBytes(pictureData.getData(), localPath);