微信小程序获取用户openid的图文教程(含源码)

wx.login({
      success(res) {
        if (res.code) {
          //发起网络请求
          wx.request({
          //这里填你自己的appid 和 wxspSecret 
            url: "https://api.weixin.qq.com/sns/jscode2session?appid=" + wxspAppid+"&secret=" + wxspSecret + "&js_code=" + res.code + "&grant_type=authorization_code" ,
            method: "POST",
            success(res){//获取成功要执行的动作},
            fail(data){//失败要执行的动作 }
          })
        } else {console.log('登录失败！' + res.errMsg)}
      }
   })

// 云函数入口函数
exports.main = async (event, context) => {
  const wxContext = cloud.getWXContext()
  console.log("OPENID",wxContext.OPENID);
  return {
    event,
    openid: wxContext.OPENID,
    appid: wxContext.APPID,
    unionid: wxContext.UNIONID,
  }
}

{
  "permissions": {
    "openapi": [
    ]
  }
}

getOpenid() {
    let that = this;
    wx.cloud.callFunction({
      name: 'get',
      complete: res => {
        //你想要完成的功能，比如存储openid到全局
        that.globalData.openid = res.result.openid;
      }
    })
  },

wx.login({
      success(res) {
        if (res.code) {
          //发起网络请求
          wx.request({
            url: "你的接口"+res.code,
            method: "POST",
            success(res){//成功后的逻辑处理 }
          })
        } else {
          wx.showToast({
            title: '出现错误',
            icon: 'fail',
            duration: 5000
          })
          console.log('出现错误！' + res.errMsg)
        }
      }
    })

@PostMapping("你的接口")
    public Response decodeOpenid(HttpServletResponse response, @RequestParam String code){
      
        response.setContentType("text/html;charset=UTF-8");
        response.setCharacterEncoding("utf-8");

        String wxspAppid = "你的appid";
        String wxspSecret = "你的密钥";

        try {
            Map<String, String> map = new HashMap<>();
            // 授权（必填）固定
            String grant_type = "authorization_code";
            // 发送请求
            String res = HttpRequest.post("https://api.weixin.qq.com/sns/jscode2session")
                    .form("appid",wxspAppid)
                    .form("secret",wxspSecret)
                    .form("js_code",code)
                    .form("grant_type",grant_type)
                    .execute().body();

            // 解析相应内容（转换成json对象）
            JSONObject json = JSONObject.parseObject(res);
            log.info("解析code请求结果:"+json.toString());
            //获取openid
            String openid = json.getString("openid");
            log.info("openid:"+openid);
            return Response.success(openid);
        } catch (Exception e) {
            e.printStackTrace();
            return Response.fail("openId生成失败");
        }
    }