优化时间返回格式

src/main/java/com/qtzl/alterSales/dao/entity/second/AflWechatSing.java

 package com.qtzl.alterSales.dao.entity.second;
 
 import cn.com.taiji.common.entity.StringUUIDEntity;
+import com.alibaba.fastjson2.annotation.JSONField;
 
 import javax.persistence.Column;
 import javax.persistence.Entity;
     /**
      * 签约状态变更时间
      */
+    @JSONField(format = "yyyy-MM-dd HH:mm:ss")
     private Date signStatusTime;
 
     /**
     /**
      * 创建时间
      */
+    @JSONField(format = "yyyy-MM-dd HH:mm:ss")
     private Date insertTime;
 
     /**
      * 修改时间
      */
+    @JSONField(format = "yyyy-MM-dd HH:mm:ss")
     private Date updateTime;
 
     @Column(name = "PLATE_NUM")

src/main/java/com/qtzl/alterSales/manager/service/AflWechatSingServiceImpl.java

 
     @Override
     public AflWechatSing findById(String id) {
-        return aflWechatSingRepo.findById(id).get();
+        return aflWechatSingRepo.findById(id).orElse(null);
     }