实践Spring Cloud之Gateway

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Spring Cloud Gateway provides a library for building an API Gateway on top of Spring MVC. Spring Cloud Gateway aims to provide a simple, yet effective way to route to APIs and provide cross cutting concerns to them such as: security, monitoring/metrics, and resiliency.

开始

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

基于Java流式API自定义RouteLocator的方式定义路由信息

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/**
	 * 基本的转发
	 * 当访问http://localhost:8080/jd
	 * 转发到http://jd.com
	 * @param builder
	 * @return
	 */
	@Bean
	public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
		return builder.routes()
				//basic proxy
				.route(r ->r.path("/jd")
						.uri("http://jd.com:80/").id("jd_route")
				).build();
	}

通过配置的方式

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spring:
  cloud:
    gateway:
      routes: #当访问http://localhost:8080/baidu,直接转发到https://www.baidu.com/
      - id: baidu_route
        uri: http://baidu.com:80/
        predicates:
        - Path=/baidu

开启端点，提供了关于Filter及routes的信息查询以及指定route信息更新的Rest API接口

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management:
  endpoints:
    web:
      exposure:
        include: '*'
  security:
    enabled: false

http://localhost:8080/actuator/gateway/routes

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[{"route_id":"jd_route","route_object":{"predicate":"org.springframework.cloud.gateway.support.ServerWebExchangeUtils$$Lambda$283/466056887@26bb1d5e"},"order":0}]

http://localhost:8081/actuator/gateway/routes

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[{"route_id":"baidu_route","route_definition":{"id":"baidu_route","predicates":[{"name":"Path","args":{"_genkey_0":"/baidu"}}],"filters":[],"uri":"http://baidu.com:80/","order":0},"order":0}]

路由断言工厂（Route Predicte Factory）

接口：RoutePredicateFactory

Path

After

Before

Between

Host

Method

Query

RemoteAddr

Weight

权重

过滤器

Global Filter

接口：GlobalFilter

Gateway Filter

GatewayFilter

过滤器工厂（Gateway Filter Factory）

接口：GatewayFilterFactory

AddRequestHeader

AddRequestParameter

RewritePath

AddResponseHeader

StringPrefix

Retry

Hystrix