uniapp请求微信接口getUserProfile获得code，后台java代码获得openid

uniapp请求微信接口，登录getUserProfile 具体代码

代码：

<template>
	<view class="container">
		<view class="userinfo">
			<block v-if="!hasUserInfo">
				<button @click="getUserProfile"> 获取头像昵称 </button>
			</block>
			<block v-else>
				<image @click="bindViewTap" class="userinfo-avatar" :src="userInfo.avatarUrl" mode="cover"></image>
				<text class="userinfo-nickname">{{userInfo.nickName}}</text>
			</block>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				userInfo: {},
				hasUserInfo: false,
			}
		},
		methods: {
			getUserProfile(e) {
				this.hasUserInfo = !this.hasUserInfo
				// 推荐使用wx.getUserProfile获取用户信息，开发者每次通过该接口获取用户个人信息均需用户确认
				// 开发者妥善保管用户快速填写的头像昵称，避免重复弹窗
				var _this = this
				uni.getUserProfile({
					desc: '用于完善会员资料', // 声明获取用户个人信息后的用途，后续会展示在弹窗中，请谨慎填写
					success: (res) => {
						console.log("res------------->", res);
						_this.userInfo = res.userInfo
					}
				})
			},

		}
	}
</script>
<style>
</style>

详情查看：微信开发文档https://developers.weixin.qq.com/miniprogram/dev/api/open-api/user-info/wx.getUserProfile.html

注意点

调用这个接口。

原本调用的是getUserInfo，但是接口调整了。就算写了getSetting也弹不出请求框，后来仔细看看，发现getUserInfo，都弃用了啊！！

一个笑死人的错误——碎碎念

• 用uniapp框架，发出的请求都是像uni.getUserProfile。开头就写uni
  还有一点就是，语法不要混用吧，用uniapp框架，发出的请求都是像uni.getUserProfile。开头就写uni。所以，我无脑复制代码过来，发现运行不起来的时候。完了，又碰到我的知识盲区了。可恶，我一个后端，到底是为什么搞前端啊，岂可修。
• @click
  uniapp的写法：<button @click="getUserProfile"> 获取头像昵称 </button>
  微信的写法：<button bindtap="getUserProfile"> 获取头像昵称 </button>
  归根结底还是我框架不熟悉，ε=(´ο｀*)))唉
  bindtap就是微信那边的写法，用到uniapp中就用@click

后台java代码获得openid

1，引入jar包

<!--微信登录-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>4.4.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
            <version>4.5.1</version>
        </dependency>

2，写工具类

import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.net.URLDecoder;

/**
 * @create 2021/8/9 14:39
 * @description:微信登录验证帮助类
 */
public class HttpRequestHelp {

    //private static Logger logger = Logger.getLogger(HttpRequestHelp.class);    //日志记录

    /**
     * httpPost
     * @param url  路径
     * @param jsonParam 参数
     * @return
     */
    public static JSONObject httpPost(String url,JSONObject jsonParam){
        return httpPost(url, jsonParam, false);
    }

    /**
     * post请求
     * @param url         url地址
     * @param jsonParam     参数
     * @param noNeedResponse    不需要返回结果
     * @return
     */
    public static JSONObject httpPost(String url,JSONObject jsonParam, boolean noNeedResponse){
        //post请求返回结果
        DefaultHttpClient httpClient = new DefaultHttpClient();
        JSONObject jsonResult = null;
        HttpPost method = new HttpPost(url);
        try {
            if (null != jsonParam) {
                //解决中文乱码问题
                StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8");
                entity.setContentEncoding("UTF-8");
                entity.setContentType("application/json");
                method.setEntity(entity);
            }
            HttpResponse result = httpClient.execute(method);
            url = URLDecoder.decode(url, "UTF-8");
            /**请求发送成功，并得到响应**/
            if (result.getStatusLine().getStatusCode() == 200) {
                String str = "";
                try {
                    /**读取服务器返回过来的json字符串数据**/
                    str = EntityUtils.toString(result.getEntity());
                    if (noNeedResponse) {
                        return null;
                    }
                    /**把json字符串转换成json对象**/
                    jsonResult = JSONObject.parseObject(str);
                } catch (Exception e) {
                    System.out.println("post请求提交失败:" + url);
                    System.out.println(e);
                }
            }
        } catch (IOException e) {
            System.out.println("post请求提交失败:" + url+e);
        }
        return jsonResult;
    }

    /**
     * 发送get请求
     * @param url    路径
     * @return
     */
    public static JSONObject httpGet(String url){
        //get请求返回结果
        JSONObject jsonResult = null;
        try {
            DefaultHttpClient client = new DefaultHttpClient();
            //发送get请求
            HttpGet request = new HttpGet(url);
            HttpResponse response = client.execute(request);

            /**请求发送成功，并得到响应**/
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                /**读取服务器返回过来的json字符串数据**/
                String strResult = EntityUtils.toString(response.getEntity(),"UTF-8");
                /**把json字符串转换成json对象**/
                jsonResult = JSONObject.parseObject(strResult);
                url = URLDecoder.decode(url, "UTF-8");
            } else {
                System.out.println("get请求提交失败:" + url);
            }
        } catch (IOException e) {
            System.out.println("get请求提交失败:" + url);
            System.out.println(e);
        }
        return jsonResult;
    }


    @SuppressWarnings("resource")
    public static String httpsGet(String url,String charset){
        HttpClient httpClient = null;
        HttpGet httpGet = null;
        String result = null;
        try{
            httpClient = new SSLClient();
            httpGet  = new HttpGet(url);
            httpGet.addHeader("Content-Type", "application/json");
            HttpResponse response = httpClient.execute(httpGet);
            if(response != null){
                HttpEntity resEntity = response.getEntity();
                if(resEntity != null){
                    result = EntityUtils.toString(resEntity,charset);
                }
            }
        }catch(Exception ex){
            ex.printStackTrace();
        }
        return result;
    }

}

3，写请求UserServiceImpl

    //微信绑定
    private static final String WX_APPID = "你的小程序的appid";
    private static final String WX_SECRET = "你的小程序的密钥";
    private static final String WX_URL = "https://api.weixin.qq.com/sns/jscode2session?appid=%s&secret=%s&js_code=%s&grant_type=authorization_code";

    @Autowired
    UserMapper userMapper;

    @Override
    public CommonResult WXlogin(String code,String nickName,String imageUrl) {
        //拼接微信api请求地址，获取openID
        String url = String.format(WX_URL,WX_APPID,WX_SECRET,code);
        //这一步调用上面写的的工具类
        JSONObject jsonObject = HttpRequestHelp.httpGet(url);
        System.out.println("jsonObject===>"+jsonObject);
        String openid = jsonObject.getString("openid");
        System.out.println("openid===>"+openid);
        //到这一步为止openid就获得了，下面就不用看了，我自存一下。
        //判断用户是否存在
        User user = userMapper.selectOne(new QueryWrapper<User>().lambda()
                .eq(User::getUserOpenid, openid));
        if (null != openid && null == user) {
            user = new User();
            user.setUserOpenid(openid);
            user.setUserImageUrl(imageUrl);
            user.setUserNickname(nickName);
            userMapper.insert(user);
            User user1 = userMapper.selectOne(new QueryWrapper<User>().lambda()
                    .eq(User::getUserOpenid, openid));
            user1.setUserOpenid(null);
            return CommonResult.success(user1);
        }
        user.setUserOpenid(null);
        return CommonResult.success(user);
    }

B站BV1Uy4y1m7fx从p=132开始看，这个视频讲的很详细。