json转字符串
String selectedRoles = jsonObject.getString("selectedroles");
String selectedDeparts = jsonObject.getString("selecteddeparts");
json转对象
SysUser user = JSON.parseObject(jsonObject.toJSONString(), SysUser.class);

 字符串转数组

String[] arr = ids.split(",");
for (String id : arr) {
   if(oConvertUtils.isNotEmpty(id)) {
      this.sysUserService.update(new SysUser().setStatus(Integer.parseInt(status)),
            new UpdateWrapper<SysUser>().lambda().eq(SysUser::getId,id));
   }
}