图片上传-bug优化

src/main/java/com/zksy/szpt/exception/NotificationException.java

@@ -5,11 +5,12 @@ package com.zksy.szpt.exception;
  */
 public class NotificationException extends Exception {
     //异常信息
-    private String message;
+    private final String message;
 
     //构造函数
     public NotificationException(String message) {
         super(message);
         this.message = message;
+        this.initCause(new Throwable(message));//设置cause，方便获取异常信息
     }
 }

src/main/java/com/zksy/szpt/service/ImageUploadService.java

@@ -70,7 +70,7 @@ public class ImageUploadService {
             xxImgfile.setData(fileContent);
             return xxImgfileMapper.insert(xxImgfile);
         } catch (Exception e) {
-            throw new NotificationException(e.getCause().getMessage());
+            throw new NotificationException(e.getCause() == null ? e.getMessage() : e.getCause().getMessage());
         }
         // 将文件内容插入数据库
 //        fileContentMono.flatMap(fileContent -> {