这篇文章将实例为大家分享Java微信扫描公众号二维码实现登陆功能，详细的代码奉上，希望能够帮助到正在苦思的你，好啦，闲话不多说，跟随错新技术频道的小编一起来往下了解吧，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 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
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
以上就是Java微信扫描公众号二维码实现登陆功能的全部内容，希望对大家的学习有所帮助，也希望大家多多支持错新技术频道。
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