Gateway--Filter、自定义全局过滤器

超、凢脫俗 2021-08-27 22:40 506阅读 0赞

### GatewaFilter Factories ###

路由过滤器可用于修改进入的HTTP请求和返回的HTTP响应，路由过滤只能指定路由进行使用。  
SpringCloud Gateway 内置了多种路由过滤器，他们都由GatewayFilter的工厂类来产生。

**生命周期：**

*  pre（前置）
 *  post（后置）

**种类：**

*  GatewayFilter  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 1]
 *  GlobalFilter  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 2]

### 自定义全局过滤器 ###

需要实现ClogbalFilter、Ordered接口。

@Component
    @Slf4j
    public class MyLogGateWayFilter implements GlobalFilter, Ordered { 
        @Override
        public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) { 
            log.info("*******come in MyLogGateWayFilter: " + new Date());
            String uname = exchange.getRequest().getQueryParams().getFirst("uname");
            if (uname == null) { 
                log.info("*******用户名为null，非法用户");
                exchange.getResponse().setStatusCode(HttpStatus.NOT_ACCEPTABLE);
                return exchange.getResponse().setComplete();
            }
            return chain.filter(exchange);
        }
    
        //返回加载过滤器的顺序，值越小越优先
        @Override
        public int getOrder() { 
            return 0;
        }
    }

启动Eureka，8001、8002和gateway网关：  
访问：`localhost:9527/payment/lb`，失败，未携带uname  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][20200319132134555.png]  
访问：`localhost:9527/payment/lb?uname=acton`，成功  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 4]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70]: /images/20210813/813e6aa35ff348858a1bcab7847768a0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 1]: /images/20210813/67ae8fed547147aa94a538a675124c78.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 2]: /images/20210813/420f6c16a91c48e18c893517bf226bf0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 3]: /images/20210813/efe79e711cdc46bf91a4e5c6fe2c0853.png
[20200319132134555.png]: /images/20210813/677b898f0b1a46d98b810094ef53d849.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NvbGRfX19wbGF5_size_16_color_FFFFFF_t_70 4]: /images/20210813/828251c9493641b5bbf18defe9f5a716.png