Required String parameter 'images' is not present

后台控制层控制为非必填即可：

  @RequestMapping("/addDo")
    @SJson
    @SLog(description = "Car_main")
    @RequiresPermissions("store.car.manager.add")
    public Object addDo(Car_main carMain, @RequestParam(value = "images",required = false)  String images, HttpServletRequest req) {

}