sonar bug fixed

xueyi-common/xueyi-common-redis/src/main/java/com/xueyi/common/redis/utils/RedisUtil.java

@@ -44,15 +44,6 @@ public class RedisUtil {
         return redisTemplate.opsForList().range(key, 0, -1);
     }
 
-    public static List<String> getBytesList(String key) {
-        List<Serializable> sers = redisTemplate.opsForList().range(key, 0, -1);
-        return sers.stream().map(ser-> (String) ser).collect(Collectors.toList());
-    }
-
-    public static void setBytesList(String key, byte[] bytes) {
-        redisTemplate.opsForList().leftPush(key, bytes);
-    }
-
     public static Long getListCount(String key) {
         return  redisTemplate.opsForList().size(key);
     }

xueyi-modules/xueyi-file/src/main/java/com/xueyi/file/utils/PdfToImageUtil.java

@@ -94,6 +94,9 @@ public class PdfToImageUtil {
      */
     private static File generateFile(MultipartFile pdfFile) throws Exception {
         String fileName = pdfFile.getOriginalFilename();
+        if (fileName == null || fileName.isEmpty()) {
+            return null;
+        }
         String directoryName = fileName.substring(0, fileName.lastIndexOf("."));
         File zipFile = new File(directoryName + "." + ZIP_SUFFIX);