使用AOP进行权限验证

首先我们定义一个切入点（匹配com.ed.controller.Seller开头的controller的所有public方法）

@Pointcut("execution(public * com.ed.controller.Seller*.*(..))")
    public void checkToken() {}

然后在进入这些方法之前进行token校验

@Before("checkToken()")
    public void check() {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();

        //查询cookie
        Cookie cookie = CookieUtil.get(request, CookieConstant.TOKEN);
        if (cookie == null) {
            log.warn("【token校验】Cookie中查不到token");
            throw new SellerAuthorizeException(ResultEnum.TOKEN_ERROR);
        }

        //去redis里查询
        String tokenValue = redisTemplate.opsForValue().get(String.format(RedisConstant.TOKEN_PREFIX, cookie.getValue()));
        if (StringUtils.isEmpty(tokenValue)) {
            log.warn("【token校验】Redis中查不到token");
            throw new SellerAuthorizeException(ResultEnum.TOKEN_ERROR);
        }
    }

抛出的异常可定义一个handler进行拦截，并返回自定义的对象给前端

@ControllerAdvice
public class SellExceptionHandler {
    @ExceptionHandler(value = SellerAuthorizeException.class)
    @ResponseBody
    public ResultVO handlerSellerException(SellerAuthorizeExceptione) {
        return ResultVOUtil.error(e.getCode(), e.getMessage());
    }

}

CookieUtil方法

/**
     * 获取cookie
     * @param request
     * @param name
     * @return
     */
    public static Cookie get(HttpServletRequest request,
                           String name) {
        Map<String, Cookie> cookieMap = readCookieMap(request);
        if (cookieMap.containsKey(name)) {
            return cookieMap.get(name);
        }else {
            return null;
        }
    }

    /**
     * 将cookie封装成Map
     * @param request
     * @return
     */
    private static Map<String, Cookie> readCookieMap(HttpServletRequest request) {
        Map<String, Cookie> cookieMap = new HashMap<>();
        Cookie[] cookies = request.getCookies();
        if (cookies != null) {
            for (Cookie cookie: cookies) {
                cookieMap.put(cookie.getName(), cookie);
            }
        }
        return cookieMap;
    }