1. 前端获取动态令牌 code

https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/getPhoneNumber.html

2. 后端接收令牌code, 调用微信获取手机号接口

POST https://api.weixin.qq.com/wxa/business/getuserphonenumber?access_token=ACCESS_TOKEN

3. controller

    /**
     * 获取用户手机号
     *
     * @param code  动态令牌。可通过动态令牌换取用户手机号
     *              注：getPhoneNumber 返回的 code 与 wx.login 返回的 code 作用是不一样的，不能混用
     * @return
     */
    @ApiOperation("获取用户手机号")
    @GetMapping("/getPhoneNumber")
    public AjaxResult getPhoneNumber(String code){
        return lsUserService.getPhoneNumber(code);
    }

4. service

    /**
     *  获取用户手机号
     *
     * @param code  手机号获取凭证
     * @return
     */
    @Override
    public AjaxResult getPhoneNumber(String code) {

        if (StringUtils.isEmpty(code)) {
            return AjaxResult.error("手机号获取凭证不能为空 !");
        }
        log.info("手机号获取凭证: {}", code);
        try {
            //通过appid和secret来获取token
            String tokenUrl = String.format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s", WxPayUtils.appId, WxPayUtils.appSecret);
            JSONObject token = JSON.parseObject(HttpUtil.get(tokenUrl));

            //通过token和code来获取用户手机号
            String url = "https://api.weixin.qq.com/wxa/business/getuserphonenumber?access_token=" + token.getString("access_token");

            //封装请求体
            Map<String, String> paramMap = new HashMap<>();
            paramMap.put("code", code);

            //封装请求头
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);

            HttpEntity<Map<String, String>> httpEntity = new HttpEntity<>(paramMap,headers);

            //通过RestTemplate发送请求，获取到用户手机号码
            RestTemplate restTemplate = new RestTemplate();
            ResponseEntity<JSONObject> response = restTemplate.postForEntity(url, httpEntity, JSONObject.class);
            String errmsg = response.getBody().getString("errmsg");
            if (errmsg.equals("ok")) {
                JSONObject phoneInfoJson = response.getBody().getJSONObject("phone_info");
                String phoneNumber = phoneInfoJson.getString("phoneNumber");
                return AjaxResult.success(phoneNumber);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return AjaxResult.error("手机号获取失败");
    }