为用户分配角色

1、首先需要查询用户所拥有的角色，进行回显

    /**
      * UserController
      * @apiParam {Integer} page 当前页码
      * @apiParam {Integer} size 当前页展示多少条数据
      * @apiParam {Integer} userId 用户id
    */
    @PostMapping("/getPageRoleOfUser")
    public Object getPageRoleOfUser(@RequestBody JSONObject obj) {
        Map<String, Object> result = new HashMap<>();
        try {
            Map<String, Object> params = new HashMap<String, Object>();
            params.put("page", obj.get("page"));
            params.put("size", obj.get("size"));
            params.put("userId", obj.get("userId"));
            PageInfo<Role> list = userService.getPageRoleOfUser(params);
            result.put("status", 200);
            result.put("msg", "成功");
            result.put("data", list);
            return