java实现二维码扫码授权登陆

 /**
 * 获取扫描登陆的二维码
 * @param noncestr随机字符串
 * @throws Exception 
 */ 
 @RequestMapping(value = "user/getLoginCode.json")
 public void getLoginCode(String noncestr,HttpServletRequest request,HttpServletResponse response) throws Exception {
 if(StringUtil.isBlank(noncestr)){
 apiData(request, response,ReqJson.error(CommonError.PARAMS_IMPERFECT));
 return;
 }
 //参数的有效性校验在拦截器里实现
 int expirationTime=300; //时效5分钟
 final String sessionId=request.getSession().getId();
 String loginCode=ToolUtils.getBase64(sessionId);
 JedisUtil.set(loginCode, loginCode, expirationTime);
 Map<String,Object> map=new HashMap<>();
 map.put("loginCode", loginCode);
 map.put("expirationTime", expirationTime);
 apiData(request, response, ReqJson.ok(map));
 }
 /**
 * 扫码确认登陆
 * @param loginCode
 * @param request
 * @param response
 * @throws Exception
 */
 @RequestMapping(value = "user/scanConfirmLogin.json")
 @AuthorizationApi
 public void scanConfirmLogin(@CurrentToken final Token token,String loginCode,HttpServletRequest request,HttpServletResponse response) throws Exception {
 if(StringUtil.isBlank(loginCode)){
 apiData(request, response,ReqJson.error(CommonError.PARAMS_IMPERFECT));
 return;
 }
 String userId=token.getUserId();
 Map<String,String> map=new HashMap<>();
 String loginTicket=JedisUtil.get(loginCode);
 if(StringUtil.isBlank(loginTicket)){
 //二维码过期
 apiData(request, response,ReqJson.error(CommonError.TWO_DIMENSIONAL_CODE_HAS_EXPIRED));
 return;
 }
 UserInfo userInfo = userInfoBiz.getUser(new UserInfo(userId)); 
 if(userInfo==null){
 apiData(request, response,ReqJson.error(UserError.USER_NOT_FOUND));
 return;
 }
 //将用户信息放在缓存中
 map.put(BaseConfig.ACCESS_TOKEN, token.getAccessToken());
 map.put("userId", userInfo.getUserId());
 map.put("rongCloudToken", userInfo.getRongCloudToken());
 map.put("identity", userInfo.getIdentity());
 JedisUtil.setMap(loginCode+"scanConfirmLogin", map, 300);
 apiData(request, response, ReqJson.ok(new Object()));
 }
 /**
 * 获取登陆状态
 * @param loginCode
 * @param request
 * @param response
 * @throws Exception
 */
 @RequestMapping(value = "user/getScanConfirmLoginStatus.json")
 public void getLoginStatus(final String loginCode,HttpServletRequest request,HttpServletResponse response) throws Exception {
 if(StringUtil.isBlank(loginCode)){
 apiData(request, response,ReqJson.error(CommonError.PARAMS_IMPERFECT));
 return;
 }
 Map<String,String> map= JedisUtil.getMap(loginCode+"scanConfirmLogin");
 if(map==null){
 apiData(request, response,ReqJson.error(CommonError.AUTHORIZATION_HAS_EXPIRED));
 return;
 }
 apiData(request, response, ReqJson.ok(map));
 }