fix

@@ -83,8 +83,8 @@ public class BackupMaterialServiceImpl extends ServiceImpl<BackupMaterialMapper,
         IPage<BackupMaterial> resultPage = backupMaterialMapper.selectPage(pageInfo, queryWrapper);
         //添加预览地址
         resultPage.getRecords().forEach(backupMaterial -> {
-            backupMaterial.setFileUrl(previewUrl+backupMaterial.getFileUrl());
-            backupMaterial.setCoverUrl(previewUrl+backupMaterial.getCoverUrl());
+            backupMaterial.setFileUrl(previewUrl+backupMaterial.getFilePath());
+            backupMaterial.setCoverUrl(previewUrl+backupMaterial.getCoverPath());
         });
         return new PageBean(Integer.parseInt(String.valueOf(resultPage.getPages())),resultPage.getTotal(),resultPage.getRecords());
     }