java微信扫描公众号二维码实现登陆功能

本文实例为大家分享了java微信扫描公众号二维码实现登陆的具体代码，供大家参考，具体内容如下

前提条件：

1.微信公众平台为服务号，
2.服务号实现了账号绑定功能，即将open_id 与业务系统中的用户名有对应关系

具体实现原理：

1.用户访问业务系统登陆页时，调用二维码接口，获得二维码的ticketid,同时将sessionid，ticketid和二维码的seceneid保存
2.返回登陆页时，根据ticketid获得微信二维码
3.页面通过ajax发送请求，判断是否已经扫描成功。
4.公众平台服务监测到扫描事件，更新seceneid中扫描二维码的业务系统用户名
5.当ajax监测到扫描成功，并返回有业务系统用户名，即可做模拟登陆！

具体代码：

根据sceneid获取，获取ticketid， sceneid可以为sessionid,或者自定义的其他任何值，但必须保证不重复

注意：这里请求的type可以为临时二维码或永久二维码，具体区别可以参看微信公众平台的开发者文档。

public static string getsceneticket(string type,string sceneid){ 
  wxscene scene = new wxscene(); 
  scene.setaction_name(type); 
  scene.setsceneid(integer.parseint(sceneid)); 
  scene.setexpire_seconds(1800); 
  string jsonscene = jsonobject.fromobject(scene).tostring(); 
  string url = weixincontents.qr_scene_ticket_url.replaceall("access_token", getaccesstoken(weixincontents.appid,weixincontents.appsecret).gettoken()); 
  system.out.println(jsonscene); 
  jsonobject jsonobject = httprequest(url, "post", jsonscene); 
  int result = 0; 
  string ticket = ""; 
  if (null != jsonobject) { 
   if (jsonobject.containskey("errcode")) { 
    result = jsonobject.getint("errcode"); 
   }else{ 
    ticket = jsonobject.getstring("ticket"); 
   } 
  } 
  return ticket; 
 } 

2.扫描二维码登陆的几个action

@actionkey("/") 
 @clearinterceptor(clearlayer.all) 
 public void index() { 
  loginuser u = (loginuser)getsessionattr("loginuser"); 
  setattr("root", this.getrequest().getcontextpath()); 
  if(null==u){ 
   setattr("ticketid",wxticket()); 
   render("/web-inf/login.html"); 
  }else{ 
   redirect("/index"); 
  } 
 } 
 private string wxticket() { 
  int sceneid = db.queryint("select seq_wx_scene.nextval from dual"); 
  string ticketid = weixinhttputils.getsceneticket("qr_scene", sceneid+""); 
  setsessionattr("ticketid",ticketid); 
  setsessionattr("sessionid",this.getrequest().getsession().getid()); 
  string sql = "insert into wx_scence_logon(id,sessionid,ticketid,scence_id) values(sys_guid(),?,?,?)"; 
  db.update(sql,this.getrequest().getsession().getid(),ticketid,sceneid); 
  return ticketid; 
 } 
 @actionkey("/cxticket") 
 @clearinterceptor(clearlayer.all) 
 public void cxticket(){ 
  string ticketid = getpara("ticketid"); 
  string sessionid = getpara("sessionid"); 
  int i=0; 
  while(i<10){ 
   record r = db.findfirst("select id from wx_scence_logon l,wx_user u where u.open_id = l.open_id and l.ticketid = ? and l.sessionid = ?",ticketid,sessionid); 
   if(r!=null&&stringutils.isnotempty(r.getstr("id"))){ 
     setattr("success","1"); 
     setattr("logonid",r.getstr("id")); 
     break; 
   }else{ 
    setattr("success","0"); 
    try { 
     thread.sleep(5000); 
     i++; 
    } catch (interruptedexception e) { 
     e.printstacktrace(); 
    } 
   } 
  } 
  render(new jsonrender().forie()); 
 } 
 @actionkey("/ticketlogon") 
 @clearinterceptor(clearlayer.all) 
 public void ticketlogon(){ 
  string id = getpara("ticketid"); 
  record r = db.findfirst("select user_id as username from wx_scence_logon l,wx_user u where u.open_id = l.open_id and l.id = ?",id); 
  if(r!=null&&stringutils.isnotempty(r.getstr("username"))){ 
   string username = r.getstr("username"); 
   loginuser user = loginuser.dao.findfirst("select user_id,xm,department_id,departmentname,userpw from gy_user u where u.username = ? and u.userlockstate = '1' ",username); 
   string permsql = "select distinct p.* from hr_user_role t,hr_role r,hr_role_perm m,hr_perms p where t.role_id = r.id and m.role_id = r.id and m.perm_id = p.id and user_id = ?"; 
   list<record> perms = db.find(permsql,new object[]{user.getstr("user_id")}); 
   if(perms!=null&&perms.size()>0){ 
    this.getsession().removeattribute("user_perms"); 
    setsessionattr("user_perms",perms); 
    getrequest().getsession().setattribute("loginuser",user); 
   } 
  } 
  this.redirect("/main"); 
 } 

3. 登陆页面

二维码显示
<img src="https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=${ticketid!}" width="250px"/> 

定时查询扫描状态

function wxcxtikcet(){ 
 $.getjson("${root!}/cxticket",{ticketid:"${ticketid}",sessionid:"${sessionid}"},function(data){ 
  //alert(data.success=="1"); 
  if(data.success=='1'){ 
   _logon(data.logonid); 
   //window.location.href="${root!}/ticketlogon/" rel="external nofollow" +data.logonid; 
  } 
 }); 
} 
var t_int = window.setinterval("wxcxtikcet()",5000); 

4.公众平台代码

}else if(eventtype.equalsignorecase(messageutil.event_type_scan)){ 
       string scene_id = eventkey; 
       if(integer.parseint(eventkey)==0){ 
        respcontent = "扫描参数出错！请刷新重试！"; 
       }else{ 
        respcontent = getscenecontent(scene_id,fromusername); 
       } 
     } 

private static string getscenecontent(string sceneid,string fromusername){ 
  string sql ="select * from wx_scence_logon where scence_id = ?"; 
  record r = db.findfirst(sql,sceneid); 
  if(r!=null){ 
   string updatesql = "update wx_scence_logon set open_id = ? where id = ?"; 
   db.update(updatesql,fromusername,r.getstr("id")); 
   return "您已成功登陆***系统！"; 
  } 
} 

说明，框架使用jfinal 1.5

大家可以参考专题：java二维码进行学习

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。