springcloud项目网关升级：gateway替代zuul以及解决gateway跨域访问问题

淩亂°似流年 2022-05-29 11:15 259阅读 0赞

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注：Spring Cloud Gateway建立在Spring Framework 5，Project Reactor和Spring Boot 2之上，使用非阻塞API。 Websockets得到支持，并且由于它与Spring紧密集成，所以将会是一个更好的 开发 体验。  
本文只讲述搭建过程，具体源码解析可以参考：[http://www.iocoder.cn/categories/Spring-Cloud-Gateway/][http_www.iocoder.cn_categories_Spring-Cloud-Gateway]  
1.添加maven依赖：

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-webflux</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-gateway</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
    </dependency>

注：gateway是用过webflux实现，在项目中请不要引用webmvc，否则初始化会报错  
2.配置过滤器：

public class loginfiler implements GlobalFilter { 
         @Override
        public Mono<Void> filter(ServerWebExchange serverWebExchange, GatewayFilterChain gatewayFilterChain) {
            。。。 
            return gatewayFilterChain.filter(serverWebExchange.mutate().request(build).build());
        }
    }

注：在这里可以实现记录日志和访问权限校验等  
3.如果是前后端分离的项目，需要增加配置以解决跨域问题：

package com.gameley.config;
    
    import org.springframework.cloud.client.discovery.DiscoveryClient;
    import org.springframework.cloud.gateway.discovery.DiscoveryClientRouteDefinitionLocator;
    import org.springframework.cloud.gateway.route.RouteDefinitionLocator;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.http.HttpHeaders;
    import org.springframework.http.HttpMethod;
    import org.springframework.http.HttpStatus;
    import org.springframework.http.server.reactive.ServerHttpRequest;
    import org.springframework.http.server.reactive.ServerHttpResponse;
    import org.springframework.web.cors.reactive.CorsUtils;
    import org.springframework.web.server.ServerWebExchange;
    import org.springframework.web.server.WebFilter;
    import org.springframework.web.server.WebFilterChain;
    import reactor.core.publisher.Mono;
    
    
    /** * @author wwmxd * @create 2018/3/22. */
    @Configuration
    public class RouteConfiguration {
        //这里为支持的请求头，如果有自定义的header字段请自己添加（不知道为什么不能使用*）
        private static final String ALLOWED_HEADERS = "x-requested-with, authorization, Content-Type, Authorization, credential, X-XSRF-TOKEN,token,username,client";
        private static final String ALLOWED_METHODS = "*";
        private static final String ALLOWED_ORIGIN = "*";
        private static final String ALLOWED_Expose = "*";
        private static final String MAX_AGE = "18000L";
    
        @Bean
        public WebFilter corsFilter() {
            return (ServerWebExchange ctx, WebFilterChain chain) -> {
                ServerHttpRequest request = ctx.getRequest();
                if (CorsUtils.isCorsRequest(request)) {
                    ServerHttpResponse response = ctx.getResponse();
                    HttpHeaders headers = response.getHeaders();
                    headers.add("Access-Control-Allow-Origin", ALLOWED_ORIGIN);
                    headers.add("Access-Control-Allow-Methods", ALLOWED_METHODS);
                    headers.add("Access-Control-Max-Age", MAX_AGE);
                    headers.add("Access-Control-Allow-Headers", ALLOWED_HEADERS);
                    headers.add("Access-Control-Expose-Headers", ALLOWED_Expose);
                    headers.add("Access-Control-Allow-Credentials", "true");
                    if (request.getMethod() == HttpMethod.OPTIONS) {
                        response.setStatusCode(HttpStatus.OK);
                        return Mono.empty();
                    }
                }
                return chain.filter(ctx);
            };
        }
        /** * *如果使用了注册中心（如：Eureka），进行控制则需要增加如下配置 */
        @Bean
        public RouteDefinitionLocator discoveryClientRouteDefinitionLocator(DiscoveryClient discoveryClient) {
            return new DiscoveryClientRouteDefinitionLocator(discoveryClient);
        }
    }

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