微信授权通过code获取openid

r囧r小猫 2024-03-17 20:29 55阅读 0赞

做公众号开发时需要获取到用户的openid做唯一标识，微信授权时通过前端调取微信授权接口获取code传给后端，后端拿到code后调取微信接口获取openid，
    appid和secret在公众号后台可以查看
    /**
     * @param
     * @Description: 获取微信公众号用户登录信息
     * @date
     */
    @GetMapping("getInfoByCode")
    public JSONObject selectWxUser(String code) {
        JSONObject jsonWxUser = new JSONObject();
        Map map = new HashMap<>();
        String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=appid+
                "&secret=" + secret+ "&code=" + code + "&grant_type=authorization_code";
        RestTemplate restTemplate = new RestTemplate();
        String response = restTemplate.getForObject(url, String.class);
        JSONObject jsonObject = JSON.parseObject(response);
        String refresh_token = jsonObject.getString("refresh_token");
        String accessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=" + appid+ "&grant_type=refresh_token&refresh_token=" + refresh_token;
        String responseAccessTokenUrl = restTemplate.getForObject(accessTokenUrl, String.class);
        JSONObject jsonObjectAccessTokenUrl = JSON.parseObject(responseAccessTokenUrl);
        String openid = jsonObjectAccessTokenUrl.getString("openid");
        if (StringUtils.isEmpty(openid)) {
            jsonWxUser.put("code", 201);
            jsonWxUser.put("data", "code已过期");
            return jsonWxUser;
        }
    
        map.put("openid", openid);
        jsonWxUser.put("code", 200);
        jsonWxUser.put("data", map);
        return jsonWxUser;
    }