手把手教你做微信小程序授权登录交互(二)

GetUserInfo() {
        var _this = this;
        // 增加约束,不选协议无法进行授权
        if (this.value === false) {
          uni.showToast({
            title: '请阅读勾选协议',
            icon: 'error',
            duration: 2000
          });
        } else {
          uni.getUserProfile({
            desc: '登录',
            lang: 'zh_CN',
            success: (res) => {
              console.log('获取的信息', res.userInfo);
              _this.nickName = res.userInfo.nickName;
              _this.setNn(res.userInfo.nickName);
              uni.getLocation({
                type: 'gci02',
                success: res => {
                  uni.reLaunch({
                    url: 'Login2'
                  });
                }
              });
            },
            fail: (res) => {
              console.log('用户拒绝了授权');
              uni.showToast({
                title: '授权失败',
                icon: 'error',
                duration: 2000
              });
            }
          });
        }
      }
login() {
          let _this = this;
          uni.showLoading({
            title: '登录中...'
          });
          // 获取登录用户 code
          uni.login({
            provider: 'weixin',
            success: function(res) {
              if (res.code) {
                let code = res.code;
                console.log('用户code:', res.code);
                uni.request({
                  url: "https://xxxxxxx:8084/wxLogin/getOpenid",
                  method: 'POST',
                  header: {
                    'Content-Type': 'application/x-www-form-urlencoded'
                  },
                  data: {
                    code: res.code, //wx.login 登录成功后的code 
                    role: _this.role,
                  },
                  success: function(cts) {
                    var openid = cts.data.openid; //openid 用户唯一标识
                    var userInfo = {
                      openid: openid,
                      role: _this.role
                    };
                    console.log(_this.role);
                    _this.saveUserInfo(userInfo);
                    uni.hideLoading();
                    uni.switchTab({
                                            // 登录成功后的跳转
                      url: '../myCenter/myCenter'
                    });
                  }
                });
              } else {
                uni.showToast({
                  title: '登录失败！',
                  duration: 2000
                });
                console.log('登录失败！' + res.errMsg)
              }
            },
          });
      }
    }

@PostMapping("/getOpenid")
    @ResponseBody
    public Map<String, Object> getOpenId(@RequestParam("code") String code,
                                         @RequestParam(value = "role") Integer role) throws IOException {
        // 返回code
        System.out.println("========== 进入wxLogin/getOpenid方法  ==========");
        System.err.println("微信授权登录");
        System.err.println("code值:  " + code);
        Map<String, Object> resultMap = new HashMap<>();
        String appid = ConstUtil.getAppId();
        String secret = ConstUtil.getSECRET();
        // 拼接sql
        String loginUrl = "https://api.weixin.qq.com/sns/jscode2session?appid=" + appid +
                "&secret=" + secret + "&js_code=" + code + "&grant_type=authorization_code";
        CloseableHttpClient client = null;
        CloseableHttpResponse response = null;
        // 创建httpGet请求
        HttpGet httpGet = new HttpGet(loginUrl);
        // 发送请求
        client = HttpClients.createDefault();
        // 执行请求
        response = client.execute(httpGet);
        // 得到返回数据
        HttpEntity entity = response.getEntity();
        String result = EntityUtils.toString(entity);
        System.out.println("微信返回的结果" + result);
        resultMap.put("data", result);
        // 对返回的结果进行解析
        JSONObject json_test = JSONObject.parseObject(result);
        String openid = json_test.getString("openid");
        String sessionKey = json_test.getString("session_key");
        System.err.println("openid值： " + openid);
        System.err.println("sessionKey值" + sessionKey);
        Users users = usersService.getUserByOpenid(openid);
        System.err.println("用户信息：" + users);
        if (StringUtils.isEmpty(openid)) {
            resultMap.put("state", ResponseCode.SUCCESS.getCode());
            resultMap.put("message", "未获取到openid");
            return resultMap;
        } else {
            // 判断是否为首次登陆
            if (users == null) {
                resultMap.put("state", ResponseCode.SUCCESS.getCode());
                resultMap.put("openid", openid);
                resultMap.put("sessionKey", sessionKey);
                resultMap.put("message", "未查询到用户信息");
            } else {
                // 查询有无结果
                UserRole uRes = userRoleService.getUserRole(openid, role);
                // 封装对象
                UserRole userRole = new UserRole(openid, role);
                // 如果不是第一次登录，第二次登陆进行判断，如果没有这个身份，进行添加，如果有这个身份，不做处理
                if (uRes == null) {
                    userRoleService.insert(userRole);
                }
                resultMap.put("state", ResponseCode.SUCCESS.getCode());
                // 前台拿的数据是map的key
                resultMap.put("openid", openid);
                resultMap.put("sessionKey", sessionKey);
                resultMap.put("user", users);
                resultMap.put("message", "该用户已经存在");
            }
            response.close();
            client.close();
        }
        return resultMap;
    }