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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