Java实现微信扫码登入的实例代码

<!-- 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>

 /**
  * 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);
 }

 /**
  * 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);
 }

 $("#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"
     );
    }
   }
  });
 });