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

2018-03-22 17:05 3639 查看




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/

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 = "*";
p
b6ca
rivate 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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