feat:错题删除

ruoyi-admin/src/main/java/com/ruoyi/web/controller/manager/UserBookManager.java

@@ -3,13 +3,13 @@ package com.ruoyi.web.controller.manager;
 import cn.hutool.core.convert.Convert;
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.ruoyi.common.utils.ShiroUtils;
+import com.ruoyi.common.utils.StringUtils;
 import com.ruoyi.system.domain.qu.ElQu;
 import com.ruoyi.system.domain.userbook.ElUserBook;
 import com.ruoyi.system.domain.userbook.dto.UserBookDTO;
 import com.ruoyi.system.service.ElQuService;
 import com.ruoyi.system.service.ElUserBookService;
 import org.springframework.stereotype.Component;
-import org.springframework.util.StringUtils;
 
 import javax.annotation.Resource;
 import java.util.Arrays;
@@ -105,7 +105,7 @@ public class UserBookManager {
 
     public String findNext(String examId, String quId) {
         Integer sort = 999999;
-        if(Objects.nonNull(quId)){
+        if(StringUtils.isNotBlank(quId)){
             QueryWrapper<ElUserBook> wrapper = new QueryWrapper<>();
             wrapper.lambda()
                     .eq(ElUserBook::getUserId, ShiroUtils.getUserId())