base64值转图片并保存在指定路径

@Slf4j
public class Base64ToPictuerUtil {

   public static Map<String,Object> uploadUtil(String base64Str, String filePath, HttpSession httpSession, HttpServletResponse response) {
      Map<String , Object> results = new HashMap<>();
      BASE64Decoder decoder = new BASE64Decoder();
      OutputStream out = null;
      try {
         // Base64解码
         byte[] bytes = decoder.decodeBuffer(base64Str.substring(base64Str.indexOf(",") + 1));
         for (int i = 0; i < bytes.length; ++i) {
            if (bytes[i] < 0) {// 调整异常数据
               bytes[i] += 1024;
            }
         }
         String fileName = UUID.randomUUID().toString().replace("-","") + ".jpg";
         String fullPath= filePath + fileName;
         //路径校验
         try {
            fullPath = this.filenameFilter(fullPath);
         } catch (IllegalPathException e) {
            log.warn(e.getMessage());
         }
         File saveFile = new File(fullPath);
         File fileParent = saveFile.getParentFile();//返回的是File类型,可以调用exsit()等方法
         if (!fileParent.exists()) {
            fileParent.mkdirs();// 能创建多级目录
         }
         if (!saveFile.exists()) {
            saveFile.createNewFile();//有路径才能创建文件
         }
         log.info(saveFile + "---------------图片保存路径");
         // 写入文件到本地存储位置
         out = new FileOutputStream(saveFile);
         out.write(bytes);
         results.put("flag",1);
         results.put("filePath",saveFile.getPath());
         results.put("fileName",fileName);
      } catch (Exception e) {
         results.put("flag", 0);
         log.error("[图片保存失败] ： uploadUtil fail",e);
      }finally {
         try {
            if(out != null){
               out.flush();
               out.close();
            }
         }catch (Exception e){
            log.error("流关闭失败",e);
            e.printStackTrace();
         }
      }
      return results;
   }
}

/**
 * 路径校验过滤
 * @param path
 * @return
 */
public static String filenameFilter(String path) throws IllegalPathException {
   String injectListStr = "../|./|/..| |<|>|~/|?";
   String[] badStrArr = injectListStr.split("\\|");
   for (String badStr : badStrArr) {
      if (path.contains(badStr)) {
         throw new IllegalPathException("路径不合法！");
      }
   }
   return path;
}