[移动开发]JAVA web App扫码登录

1：web端请求服务端获取到sessionId，将sessionId设置一个过期时间存入redis

@ApiOperation("前端生成二维码，请求绑定关系,二维码过期时间30秒")
@PostMapping("/request")
public AjaxResult request(HttpServletRequest request) {
    String id = request.getSession().getId();
    redisService.set(id, id, 30);
    return AjaxResult.success("", id);
}

2：轮询，返回给前端信息

@ApiOperation("前端轮询该接口，扫码登录之后返回信息")
@PostMapping("/loopCode")
public AjaxResult loopCode(String sessionId) {
   Object o = redisService.get(sessionId);
   if (ObjectUtils.isEmpty(o)) {
       return AjaxResult.error("二维码已过期");
   }
   // APP端扫码认证成功之后将1中的缓存sessionId 更新为success或者自定义值
   if (o.toString().equals("success")) {
      // 将令牌和用户信息返回给web端跳转即可
      String mobile = (String) redisService.get(sessionId + "login");
      String token = (String) redisService.get(sessionId + mobile);
      AppUser user = tokenManage.getUser(token);
      Map map = new HashMap();
      map.put("token", token);
      map.put("user", user);
      return AjaxResult.success(map);
    }
    return new AjaxResult(AjaxResult.Type.SCAN_CODE, "扫码中");
}

3：扫码登录，app请求之后获取到二维码中的sessionId，将sessionId和手机号在缓存中绑定，并修改1中的缓存value

 @ApiOperation("扫码登录")
    @PostMapping("/scanLogin")
    public AjaxResult scanLogin(String mobile, String sessionId) {
        Object o = redisService.get(sessionId);
        if (ObjectUtils.isEmpty(o)) {
            return AjaxResult.error("无效码");
        }
        AppUser appUser = appUserService.selectAppUserByPhonenumber(mobile);
        String token = tokenManage.getToken(appUser);
        if (ObjectUtils.isEmpty(token)) {
            return new AjaxResult(APP_AUTH_LOGIN, "令牌已过期，请重新登录");

        }
        redisService.set(sessionId, "success", 20);
        redisService.set(sessionId + "login", mobile, 20);
        redisService.set(sessionId + mobile, token,20);
        return AjaxResult.success();
    }