添加gateway依赖

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>

创建一个tokenFilter

实现全局过滤器GlobalFilter,并且实现fitler方法

    @Value("${cn.token.key}")
    private String tokenKey;

  public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpResponse response = exchange.getResponse();
        List<String> tokens = exchange.getRequest().getHeaders().get("token");
        if(ObjectUtil.isEmpty(tokens)){
            log.debug("请传输token");
            response.setStatusCode(HttpStatus.PAYMENT_REQUIRED);
            return response.setComplete();
        }
        String token = tokens.get(0);
        if(ObjectUtil.isEmpty(token)){
            log.debug("token不能为空");
            response.setStatusCode(HttpStatus.PAYMENT_REQUIRED);
            return response.setComplete();
        }

        boolean b = false;
        try {
            //利用jwt对token进行验证
            JWTValidator.of(token).validateAlgorithm(JWTSignerUtil.hs256(tokenKey.getBytes())).validateDate();
            b = true;
        }catch (Exception ex){
            ex.printStackTrace();
            log.error("token不正确");
        }
        if(!b){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        return chain.filter(exchange);
    }