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);
 }

• 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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