微信登录

# 微信开放平台 appid
wx.open.app-id=你的appid
# 微信开放平台 appsecret
wx.open.app-secret=你的secret
# 微信开放平台 重定向url
wx.open.redirect-uri=重定向url/api/user/wx/callback

package com.atguigu.yygh.user.utils;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

@Configuration
@PropertySource("classpath:wx.properties")
@ConfigurationProperties(prefix = "wx.open")
@Data
public class ConstantProperties {

    private String appId;
    private String appSecret;
    private String redirectUri;

}

 //切换微信登录
    weixinLogin() {
      this.dialogAtrr.showLoginType = 'weixin'

      user.getQRCodeParams().then((response) =>{
        new WxLogin({
          //true：手机单击确认后可以在iframe内跳转到redirecturl
        //false ：手机单击确认登录后可以在top window 跳转到redirecturl
            self_redirect: false,
            id: 'weixinLogin', // 显示二维码的容器id
            appid: response.data.appid, 
            scope: response.data.scope, 
            redirect_uri: response.data.redirectUri,
            state: response.data.state, 
            style: 'black', // 提供"black"、"white"可选。二维码的样式
            href: '', // 外部css文件url，需要https

        }) 
      })
    },

 //获得微信登录二维码的相关参数
  getQRCodeParams(){
    return request({
      url : `/api/user/wx/getQRCodeParams`,
      method : `get`
    })
  },

package com.atguigu.yygh.user.controller.api;

import com.atguigu.yygh.common.exception.YyghException;
import com.atguigu.yygh.common.result.R;
import com.atguigu.yygh.common.result.ResultCode;
import com.atguigu.yygh.common.utils.JwtHelper;
import com.atguigu.yygh.model.user.UserInfo;
import com.atguigu.yygh.user.service.UserInfoService;
import com.atguigu.yygh.user.utils.ConstantProperties;
import com.atguigu.yygh.user.utils.HttpClientUtils;
import com.google.gson.Gson;
import com.sun.org.apache.regexp.internal.RE;
import io.swagger.annotations.Api;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.client.utils.URLEncodedUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import sun.net.util.URLUtil;

import javax.net.ssl.HttpsURLConnection;
import javax.servlet.http.HttpSession;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.UUID;

@Api(tags = "微信扫码登录")
@Controller //注意这里没有配置@restcontroller
@RequestMapping("/api/user/wx")
@Slf4j
public class ApiWxController {

    @Autowired
    private ConstantProperties constantProperties;

    @Autowired
    private UserInfoService userInfoService;

    /**
     * 方法一： 在新的页面打开显示二维码
     */
    @GetMapping("/getQRCodeUrl")
    public String getQRCodeUrl(HttpSession session){

        try {
            //处理回调url
            String redirectUrl = URLEncoder.encode(constantProperties.getRedirectUri(), "UTF-8");

            //处理state ：生成随机数，存入session
            String state = UUID.randomUUID().toString();
            log.info("生成的state = "+ state);
            session.setAttribute("wx_open_state",state);


            //要重定向的地址
            String qrcUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                    "?appid=" + constantProperties.getAppId() +
                    "&redirect_uri=" + redirectUrl +
                    "&response_type=code" +
                    "&scope=snsapi_login" +
                    "&state=" + state +
                    "#wechat_redirect";

            return "redirect:" + qrcUrl;
        } catch (UnsupportedEncodingException e) {
            throw new YyghException(ResultCode.ERROR,"生成二维码错误");
        }
    }

    /**
     * 在内嵌窗口打开
     * @param session
     * @return
     */
    @GetMapping("/getQRCodeParams")
    @ResponseBody
    public R getQRCodeParams(HttpSession session){
        try {
            String redirectUrl = URLEncoder.encode(constantProperties.getRedirectUri(), "UTF-8");

            String state = UUID.randomUUID().toString();
            log.info("生成的state ： "+ state);
            session.setAttribute("wx_open_state",state);

            //组装好返回给前端的数据
            HashMap<String, Object> map = new HashMap<>();
            map.put("appid",constantProperties.getAppId());
            map.put("redirectUri",redirectUrl);
            map.put("scope","snsapi_login");
            map.put("state",state);

            return R.ok().data(map);

        } catch (UnsupportedEncodingException e) {
            throw new YyghException(ResultCode.ERROR,"生成二维码错误");
        }

    }

    /**
     * 回调函数
     */
    @GetMapping("/callback")
    public String callback(String code, String state, HttpSession session)  {

        try {
            String sessionState = (String)session.getAttribute("wx_open_state");

            //判空操作
            if(StringUtils.isEmpty(code) || StringUtils.isEmpty(state) || !state.equals(sessionState)){
                throw new YyghException(ResultCode.ERROR,"回调参数错误");
            }

            //向微信发送请求，请求获得access_tokens
            String accessTokenUrl ="https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=" + constantProperties.getAppId() +
                    "&secret=" + constantProperties.getAppSecret() +
                    "&code=" + code +
                    "&grant_type=authorization_code";

            //使用httpclient发送请求
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //将json'转换成map 获取其中的errcode键值 ，来判断相应的成功与否
            Gson gson = new Gson();
            HashMap<String,Object> accessTokenInfoMap = gson.fromJson(accessTokenInfo, HashMap.class);

            //通过错误码是否存在来判断响应是否成功
            if(accessTokenInfoMap.get("errcode") !=null ){ //errcode只要存在就说明有错误
                throw new YyghException(ResultCode.ERROR,"获取access_token失败");
            }

            //微信获取access_token成功
            String openid = (String) accessTokenInfoMap.get("openid");
            String accessToken = (String) accessTokenInfoMap.get("access_token");

            //根据openid判断数据库中的数据是否存在
            UserInfo  userInfo= userInfoService.selectWxInfoByOpenId(openid);
            if(userInfo==null){
                //用户不存在则进行注册操作

                //向微信的资源服务器发送请求，获得当前用户的信息
                String userInfoUrl ="https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=" + accessToken +
                        "&openid=" + openid;

                String userInfResult = HttpClientUtils.get(userInfoUrl);
                HashMap<String,Object> userInfResultMap = gson.fromJson(userInfResult, HashMap.class);
                //判断响应是否失败，同上
                //通过错误码是否存在来判断响应是否成功
                if(accessTokenInfoMap.get("errcode") !=null ){ //errcode只要存在就说明有错误
                    throw new YyghException(ResultCode.ERROR,"获取用户信息失败");
                }

                //解析用户信息
                String nickname =(String) userInfResultMap.get("nickname");

                //用户注册（添加）
                 userInfo = new UserInfo();
                 userInfo.setName(nickname);
                 userInfo.setNickName(nickname);
                 userInfo.setOpenid(openid);
                 userInfoService.save(userInfo);
            }else {
                //用户存在则只需判断用户状态是否可用
                if(userInfo.getStatus() == 0){
                    throw new YyghException(ResultCode.ERROR,"用户已被锁定");
                }
            }

            //生成jwt字符串
            String token = JwtHelper.createToken(userInfo.getId(), userInfo.getName());

            //跳转到前端页面
            return "redirect:http://localhost:3000/" +
                    "?token=" + token +
                    "&name=" + URLEncoder.encode(userInfo.getName(), "utf-8") +
                    "&openid=" + openid +
                    "&phone=" + userInfo.getPhone() ;
        } catch (Exception e) {

            throw new YyghException(ResultCode.ERROR,"微信登录失败",e);
        }

    }

}