java扫码登录

这篇博文主要记录我实现扫码登录的步骤，及代码。其实之前从网上搜了很久扫码登录，copy版很多，所以回答也就那几种。

我把我自己的思路也说一下吧。如果有更好的意见或者我有不对的地方，请指出。

首先说一下我用的技术， maven构建项目，ssh ，redis, shiro, goeasy推送，ZXing二维码生成。

图有点粗糙。凑合看，我解释一下，首先我认为，session肯定是浏览器和服务器交互唯一的标识，所以我认为sessionid可以直接定位到是哪一个用户进行扫码登录，

OK，那么围绕这一点，当浏览器打开我们的网站时，我们就getsession，这样保证先给浏览器一个session对象。

接下来我将用代码展示的方式给大家展示一下流程

首先从网上扒了一个监听全局session的监听器。

public class MySessionContext {private static HashMap mymap = new HashMap();public static synchronized void AddSession(HttpSession session) {if (session != null) {mymap.put(session.getId(), session);}}public static synchronized void DelSession(HttpSession session) {if (session != null) {mymap.remove(session.getId());}}public static synchronized HttpSession getSession(String session_id) {if (session_id == null)return null;return (HttpSession) mymap.get(session_id);}
}

public class MySessionListener {public void sessionCreated(HttpSessionEvent httpSessionEvent) {MySessionContext.AddSession(httpSessionEvent.getSession());}public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {HttpSession session = httpSessionEvent.getSession();MySessionContext.DelSession(session);}
}

 <listener>
<listener-class>cn.itcast.web.action.lisener.MySessionListener</listener-class>
</listener>

这个实际上没啥必要。。。直接通过jssionid获取就可以了。当时没想到

登录Action

@Action("loginAction_login")public String login() throws Exception {Map<String, Object> session = ActionContext.getContext().getSession();Subject subject = SecurityUtils.getSubject();//shiroif(session.get(SysConstant.CURRENT_USER_INFO)!=null){//如果有session用户信息，直接走验证，说明是手机扫码的User user = (User) session.get(SysConstant.CURRENT_USER_INFO);subject.login(new UsernamePasswordToken(user.getUserName(),user.getPassword()));}if(subject.isAuthenticated()){//验证成功直接返回成功。return SUCCESS;}if(UtilFuns.isEmpty(username)){//为浏览器分配sessionHttpServletRequest request = ServletActionContext.getRequest();sessID = request.getSession().getId();super.push(sessID);request.getSession().setAttribute("ssid", sessID);return "login";}try {//登录成功赋值sessionString md5 = Encrypt.md5(password, username);subject.login(new UsernamePasswordToken(username, md5));session.put(SysConstant.CURRENT_USER_INFO, (User)subject.getPrincipal());} catch (Exception e) {e.printStackTrace();request.put("errorInfo", "对不起，登录失败，用户名或密码错误！！！");HttpServletRequest request = ServletActionContext.getRequest();sessID = request.getSession().getId();super.push(sessID);//压栈request.getSession().setAttribute("ssid", sessID);//为了获得图片二维码时有sessionreturn "login";}User user =(User)subject.getPrincipal();//4.将user对象保存到session域中session.put(SysConstant.CURRENT_USER_INFO, user);//5.跳页面return SUCCESS;}

这里实际上页面也悄悄工作了

<script>
function changeCode(){$("#erweima").attr('src','${ctx}/mobile/MobileCode?t='+new Date().getTime());//选择二维码时直接去替换二维码图片
}
</script>
<script type="text/javascript" src="http://cdn.goeasy.io/goeasy.js"></script>
<script type="text/javascript">var goEasy = new GoEasy({appkey: 'BC-c9196bffff9b4fcabd70a200f95a51d2'});goEasy.subscribe({channel: '${sessID }',//这里绑定sessionid保证推送是指定用户onMessage: function(message){location.reload()}});</script></head>

public class QRCodeUtil extends BaseAction{  @Action(value="MobileCode")public void getcode(){//生成二维码HttpServletResponse response;String urls;Hashtable<EncodeHintType, String> hints;BitMatrix matrix;try {response = (HttpServletResponse)ActionContext.getContext().get(org.apache.struts2.StrutsStatics.HTTP_RESPONSE);Jedis jedis =new Jedis("192.168.123.101");HttpServletRequest request = ServletActionContext.getRequest();String sessID = (String) session.get("ssid");String id = request.getSession().getId();MySessionContext.AddSession(request.getSession());String key = Encrypt.md5(UUID.randomUUID().toString(), "cao");jedis.set(key, sessID, "NX", "EX", 1800);urls = "http://192.168.123.96:8080/test/mobileAutoLog?parms="+key;//这是手机端扫码的结果hints = new Hashtable<EncodeHintType, String>();  hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");  matrix = null;matrix = new MultiFormatWriter().encode(urls,  BarcodeFormat.QR_CODE, 300, 300, hints);  MatrixToImageWriter.writeToStream(matrix, "jpg", response.getOutputStream());} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();}  }

然后假装扫码成功

。

我不得不插一段安卓代码了。。。

public void ineedLogin(View v){//扫码成功SharedPreferences sharedPreferences = getSharedPreferences("userinfo", 1);token = sharedPreferences.getString("username", "");try {GetDataFromService();} catch (Exception e) {e.printStackTrace();}}private void GetDataFromService() throws   Exception{RequestParams params = new RequestParams(result+"&username="+token);//去访问浏览器发过来的请求，并且拼接上用户的用户名。x.http().post(params, new Callback.CacheCallback<String>() {@Overridepublic boolean onCache(String result) {return false;}@Overridepublic void onSuccess(String result) {}@Overridepublic void onError(Throwable ex, boolean isOnCallback) {}@Overridepublic void onCancelled(CancelledException cex) {}@Overridepublic void onFinished() {}});

其实我这里选了一个比较low的。。我为了省事，安卓直接拼了username过去。。还用了个Xutils...搞得重写了很多方法。。别笑我。。哈哈哈哈

好了我们再来看扫码成功的action

Jedis jedis =new Jedis("192.168.123.101");String jedisParms = jedis.get(parms);if(jedisParms!=null&&!jedisParms.equals("")){//去看redis是否有手机端传过来这个码，List<User> find = userService.find(new Specification<User>() {@Overridepublic Predicate toPredicate(Root<User> root, CriteriaQuery<?> query, CriteriaBuilder cb) {return cb.equal(root.get("userName").as(String.class),username);}});User u1 = find.iterator().next();//拿到用户信息HttpSession session = MySessionContext.getSession(jedisParms);//拿到sessionsession.setAttribute(SysConstant.CURRENT_USER_INFO, u1);final String APP_KEY="BC-c9196bffff9b4fcabd70a200f95a51d2";GoEasy goEasy =new GoEasy(APP_KEY);goEasy.publish(jedisParms,"heh" ); //直接推送前端return NONE;}else{System.out.println("验证失败");}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return "error";
}

前端收到推送之后会刷新页面，并且session里面已经有值，那么会走登录验证的方法，session有值的方法。

我们再来看shiro，这里当时我有点懵，因为shiro实际上我用的不是很熟悉，就知道它运行的流程，当时不知道怎么才能让他验证通过，所以走了很多次shiro的登录方法，如果有别的好办法!也希望大家告诉我！！！

protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken arg0) throws AuthenticationException {Map<String, Object> session = ActionContext.getContext().getSession();User object = (User) session.get(SysConstant.CURRENT_USER_INFO);if(object!=null){//手机final String username = object.getUserName();List<User> findUser = userService.find(new Specification<User>() {@Overridepublic Predicate toPredicate(Root<User> root, CriteriaQuery<?> query, CriteriaBuilder cb) {// TODO Auto-generated method stubreturn cb.equal(root.get("userName").as(String.class), username);}});return new SimpleAuthenticationInfo(findUser,findUser.get(0).getPassword(),this.getName());}else{//电脑UsernamePasswordToken  userNamePassword=(UsernamePasswordToken) arg0;final String username = userNamePassword.getUsername();List<User> findUser = userService.find(new Specification<User>() {@Overridepublic Predicate toPredicate(Root<User> root, CriteriaQuery<?> query, CriteriaBuilder cb) {// TODO Auto-generated method stubreturn cb.equal(root.get("userName").as(String.class), username);}});if(findUser!=null && findUser.size()!=0){return new SimpleAuthenticationInfo(findUser,findUser.get(0).getPassword(),this.getName());}}return null;}

因为之前没有加扫码登录时，我HashMd5是在这个密码比较器里加的，加了扫码之后，页面出过来明文我就直接加密了。所以密码比较器里面，直接比较就可以了

	public boolean doCredentialsMatch(AuthenticationToken token, AuthenticationInfo info) {UsernamePasswordToken uToken =(UsernamePasswordToken) token;String en =new String(uToken.getPassword());return equals(en, info.getCredentials());}

到此java扫码登录完成！

如果各位有别的好思路，希望也分享给我。