java微信扫描公众号二维码实现登陆功能_Java教程

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！"; 

									  } 

									}