mybatis-xml中list和数组，size和length

原因：java.lang.IllegalArgumentException：无效比较：java.util.ArrayList和java.lang.String

这个情况在list集合查找数据的sql中出的问题，在接受list的时候加了判断  list!='' ,引起了集合与String类型的比较

https://blog.csdn.net/ZHOU_VIP/article/details/97640784

//批量删除考核人员 @RequestMapping("/removecheck") @ResponseBody public ClaaAjaxResult removecheck(HttpServletRequest request) throws Exception{ ClaaAjaxResult ret = new ClaaAjaxResult(); String projectid = request.getParameter("projectid"); String personids = request.getParameter("personids"); personids = (personids == null) ? "" : personids.trim(); String[] personidsArr = personids.split(","); if (personids.equals("") || personidsArr == null || personidsArr.length == 0) { ret.setRetCode(ClaaAjaxResult.RET_CODE_ERR); re