javaweb实现app扫码登录功能

package com.*;
 
 
@Controller
@RequestMapping(value = "/login")
public class LoginController{
 
 @Autowired
 private UserInfoBaseService userInfoBaseService;
 
 //存储二维码维一标识
 public static Set<String> tokes = new HashSet<>();
 //存储toke绑定的用户
 public static Map<String,String> users = new HashMap<>();
 
 /**
 * 生成二维码维一标识Toke
 * @return
 */
 @ResponseBody
 @RequestMapping("/generationQRCode")
 public String generationToken(){
 String uid = UUID.randomUUID().toString();
 tokes.add(uid);
 return uid;
 }
 
 /**
 * app扫码后将token与用户绑定
 * @param loginName
 * @param token
 * @return
 */
 @ResponseBody
 @RequestMapping("/determine")
 public ResponseEntity determine(String loginName, String token){
 for (String t:tokes) {
  if(t.equals(token)){
  users.put(token,loginName);
  UserInfo userInfo = userInfoBaseService.getUserByLoginName(loginName);
  if(null==userInfo){return new ResponseFailure("用户不存在");}
  return new ResponseEntity("正在登录请稍后...");
  }
 }
 return new ResponseEntity("请求无效");
 }
 
 /**
 * Axaj定时请求是否有用户扫描了二维码
 * @param token
 */
 @ResponseBody
 @RequestMapping("/scanLogin")
 public String scanLogin(String token){
 if(StringKit.isBlank(token)){return "token is null";}
 String loginName = users.get(token);
 if(StringKit.isBlank(loginName)){ return "error";}
 //Subject subject = SecurityUtils.getSubject(); //注释的这三行换成你自已的登录代码就行了
 //subject.logout();
 //UsernamePasswordTokenType tokenType = new UsernamePasswordTokenType(loginName, "123456",2);
 try{
  subject.login(tokenType);
 }catch (Exception e){
  e.printStackTrace();
 }
 users.remove(token);
 tokes.remove(token);
 return "success";
 }
 
}

//获取维一标识token生成二维码
 $.post('${ctx}/login/generationQRCode', function (token) {
   new QRCode(document.getElementById('qrcode'), {text:token,height:125,width:125});
   $('#qrcode').removeAttr('title');
   $('#qrcode').attr('token',token);
    });
    //ajax定时查看是否有用户扫码后未登入
    var time = window.setInterval(function () {
      var token = $('#qrcode').attr('token');
      if(token){
        $.post('${ctx}/login/scanLogin',{'token':token},function (data) {
          if(data == 'success'){
            clearInterval(time);
            window.location.href = '${ctx}/login/';
          }
      })
   }
},1000);