TASK: 全局异常处理，代码优化，测试数据库连接信息变更;

src/main/java/com/ai/da/controller/DesignController.java

@@ -1,15 +1,16 @@
 package com.ai.da.controller;
 
+import com.ai.da.common.config.exception.BusinessException;
 import com.ai.da.common.response.Response;
 import com.ai.da.model.dto.*;
 import com.ai.da.model.vo.DesignCollectionVO;
 import com.ai.da.model.vo.DesignLikeVO;
 import com.ai.da.service.DesignService;
-import com.alibaba.fastjson.JSONObject;
 import io.swagger.annotations.Api;
 import io.swagger.annotations.ApiOperation;
 import io.swagger.annotations.ApiParam;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.web.bind.MethodArgumentNotValidException;
 import org.springframework.web.bind.annotation.*;
 
 import javax.annotation.Resource;