Java实现微信扫码登入的实例代码

微信扫码登入

首先去通过微信开放平台做好开发者资质认证，创建网站应用然后等待审核

开发者资质认证

网站应用

审核通过的话就是这个样子 还有最底下的授权回调地址 (www.xxxxx.com) 填写域名即可

pom

<!-- WeChatQrCode -->
		<dependency>
			<groupId>com.github.binarywang</groupId>
			<artifactId>weixin-java-mp</artifactId>
			<version>3.4.0</version>
		</dependency>
		<dependency>
			<groupId>org.junit.jupiter</groupId>
			<artifactId>junit-jupiter-api</artifactId>
			<version>RELEASE</version>
			<scope>compile</scope>
		</dependency>

第一步 用户通过点击事件获取到微信二维码连接

 /**
   * 获取微信登陆二维码地址
   * @return
   */
  @RequestMapping(value = "/getQRCodeUrl",method = RequestMethod.POST)
  public Message getQRCodeUrl() {
    logger.info("获取二维码地址");
    try {
      String codeUrl = weChatService.getQRCodeUrl();
      logger.info("codeUrl:"+codeUrl);
      return new Message(ResponseEnum.SUCCESS,codeUrl);
    }catch (Exception e){
      logger.error(e.toString()+e);
      return new Message(ResponseEnum.FALL);
    }
  }

 @Override
  public String getQRCodeUrl() {
    // 生成 state 参数，用于防止 csrf
    String date = DateUtil.format(new Date(), "yyyyMMdd");
    String state = MD5Utils.generate(CSRF_KEY + date);
    return wxMpService.buildQrConnectUrl(wxRedirectUrl,"snsapi_login", state);
  }

https://open.weixin.qq.com/connect/qrconnect?appid=xxxx&redirect_uri=xxxxxx&response_type=code&scope=snsapi_login&state=e97555458779708b99b9d40cb49f54245c7500e536445d32#wechat_redirectappid 是你网站应用里面的 redirect_uri 你设置的授权回调地址 scope网站扫码登入为snsapi_login即可 state。微信开放平台文档文档写的很详细，看不懂看文档

用户扫码成功之后微信会回调你设置的回调地址 获取二维码连接

 /**
   * 回调地址
   * @param code
   * @param state
   * @return
   */
  @RequestMapping(value = "/wxCallBack",method = RequestMethod.POST)
  public Message wxCallBack(HttpServletRequest request, HttpServletResponse response,
      @RequestParam(name = "code",defaultValue = "") String code, @RequestParam(name = "state",defaultValue = "")String state) {
    if(StringUtils.isBlank(code)){
      return new Message(ResponseEnum.ESSENTIAL_IS_NULL);
    }
    if(StringUtils.isBlank(state)){
      return new Message(ResponseEnum.ESSENTIAL_IS_NULL);
    }
    logger.info("微信回调------------");
    logger.info(code+"------"+state);
    try {
      Message message=weChatService.wxCallBack(request,code, state);
      return message;
    }catch (Exception e){
      logger.error(e.toString()+"\n"+e);
      return new Message(ResponseEnum.FALL);
    }
  }

@Override
  public Message wxCallBack(HttpServletRequest request, String code, String state) {
    String openId = null;
    if (code != null) {
      // 获取 openid
      try {
        WxMpOAuth2AccessToken accessToken = wxMpService.oauth2getAccessToken(code);
        if (accessToken == null) {
          return new Message(ResponseEnum.DATA_IS_NULL);
        }
        openId = accessToken.getOpenId();
        log.info("openId:" + openId);
        /*token = accessToken.getAccessToken();*/
         WxMpUser wxUser = wxMpService.oauth2getUserInfo(accessToken, null);
         log.info(wxUser.toString());
      	   return new Message(ResponseEnum.WECHAT_NOT_BINGDING, wxUser);
      } catch (WxErrorException e) {
        log.error(e.getMessage(), e);
        return new Message(ResponseEnum.FALL);
      }
    }
    return new Message(ResponseEnum.FALL);
  }

前端请求

 $("#weiLog").click(function () {
    $.ajax({
      type: "POST",
      url: "/api/wx/getQRCodeUrl",
      dataType: 'json',
      success: function (result) {
        //console.log(result);
        if(result.code==0){
          this.itop = (window.screen.availHeight - 500) / 2;
          //获得窗口的水平位置
          this.ileft = (window.screen.availWidth - 400) / 2;
          this.w = window.open(
            result.data,
            "newwindow",
            "height=500, width=600, top=" +
            this.itop +
            ", left = " +
            this.ileft +
            ", toolbar=no, menubar=no,scrollbars=no, resizable=no,location=no, status=no"
          );
        }
      }
    });
  });

总结

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