Gateway网关---Filter过滤器

Dear 丶 2023-02-22 03:49 41阅读 0赞

官网关于过滤器的文档地址[https://cloud.spring.io/spring-cloud-gateway/2.2.x/reference/html/\#gatewayfilter-factories][https_cloud.spring.io_spring-cloud-gateway_2.2.x_reference_html_gatewayfilter-factories]

过滤请求头包含参数 X-Request-red 并且值是blue的

spring:
      cloud:
        gateway:
          routes:
          - id: add_request_header_route
            uri: https://example.org
            filters:
            - AddRequestHeader=X-Request-red, blue

### 自定义过滤器 ###

创建一个类实现`GlobalFilter`和`Ordered`接口  
可以通过exchange获取请求的`Request`和`Response`对象，然后获取其中的内容，进行判断过滤，然后加入到chain中即可

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
    import org.springframework.cloud.gateway.filter.GlobalFilter;
    import org.springframework.core.Ordered;
    import org.springframework.http.HttpStatus;
    import org.springframework.stereotype.Component;
    import org.springframework.web.server.ServerWebExchange;
    import reactor.core.publisher.Mono;
    
    @Component
    public class MyGatewayFilter implements GlobalFilter, Ordered { 
        
        @Override
        public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) { 
            String name = exchange.getRequest().getQueryParams().getFirst("name");
            if (name==null){ 
                System.out.println("用户名为null");
                exchange.getResponse().setStatusCode(HttpStatus.NOT_ACCEPTABLE);
                return exchange.getResponse().setComplete();
            }
            chain.filter(exchange);
            return null;
        }
    
        @Override
        public int getOrder() { 
            return 0;
        }
    }

[https_cloud.spring.io_spring-cloud-gateway_2.2.x_reference_html_gatewayfilter-factories]: https://cloud.spring.io/spring-cloud-gateway/2.2.x/reference/html/#gatewayfilter-factories