微信小程序获取OpenId

在微信小程序中获取OpenId首先需要获取AppId和Secret。

AppId和Secret获取方法

前端

    wx.login({
      success(res) {
        if (res.code) {
          //向后端发起网络请求
          wx.request({
            url: 'http://127.0.0.1:9090/testopenid',
            data: {
              code: res.code
            },
            success:(response)=>{
              //打印OpenId
              console.log(response.data);
            }
          })
        } else {
          console.log('登录失败！' + res.errMsg)
        }
      }
    })

后端：使用Java语言

package cn.order_api.controller;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestOpenId {

    @RequestMapping("/testopenid")
    public String getUserInfo(@RequestParam(name = "code") String code) throws Exception {
        System.out.println("code" + code);
        String url = "https://api.weixin.qq.com/sns/jscode2session";
        url += "?appid=xxxx";//将xxxx改成自己的appid
        url += "&secret=xxxx";//将xxxx改成自己的appSecret
        url += "&js_code=" + code;
        url += "&grant_type=authorization_code";
        url += "&connect_redirect=1";
        String res = null;
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        // DefaultHttpClient();
        HttpGet httpget = new HttpGet(url);    //GET方式
        CloseableHttpResponse response = null;
        // 配置信息
        RequestConfig requestConfig = RequestConfig.custom()          // 设置连接超时时间(单位毫秒)
                .setConnectTimeout(5000)                              // 设置请求超时时间(单位毫秒)
                .setConnectionRequestTimeout(5000)             // socket读写超时时间(单位毫秒)
                .setSocketTimeout(5000)                    	   // 设置是否允许重定向(默认为true)
                .setRedirectsEnabled(false).build();           // 将上面的配置信息 运用到这个Get请求里
        httpget.setConfig(requestConfig);                      // 由客户端执行(发送)Get请求
        response = httpClient.execute(httpget);                // 从响应模型中获取响应实体
        HttpEntity responseEntity = response.getEntity();
        System.out.println("响应状态为:" + response.getStatusLine());
        if (responseEntity != null) {
            res = EntityUtils.toString(responseEntity);
            System.out.println("响应内容长度为:" + responseEntity.getContentLength());
            System.out.println("响应内容为:" + res);
        }
        // 释放资源
        if (httpClient != null) {
            httpClient.close();
        }
        if (response != null) {
            response.close();
        }
        JSONObject jo = JSON.parseObject(res);
        String openid = jo.getString("openid");
        System.out.println("openid" + openid);
        return openid;
    }
}