参考文档：Spring Gateway官方文档 , 玹霖的博客
1.Spring Gateway简介
Spring Cloud Gateway是Spring官方基于Spring 5.0，Spring Boot 2.0和Project Reactor等技术开发的网关，Spring Cloud Gateway旨在为微服务架构提供一种简单而有效的统一的API路由管理方式。Spring Cloud Gateway作为Spring Cloud生态系中的网关，目标是替代Netflix ZUUL，其不仅提供统一的路由方式，并且基于Filter链的方式提供了网关基本的功能，例如：安全，监控/埋点，和限流等。
2.Spring Gateway工作原理
Spring Gateway工作结构图
spring_cloud_gateway_diagram.png
3.Spring Gateway配置和使用
由于项目使用maven模块化配置，Springboot版本为：2.0.3.RELEASE, SpringCloud版本为：Finchley.RELEASE
- pom配置：
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<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>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-contract-stub-runner</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-consul-discovery</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>artifactId</span><span class="token punctuation">></span></span>spring-cloud-dependencies<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>version</span><span class="token punctuation">></span></span>${spring-cloud.version}<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>version</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>groupId</span><span class="token punctuation">></span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>groupId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>artifactId</span><span class="token punctuation">></span></span>spring-boot-dependencies<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>version</span><span class="token punctuation">></span></span>${spring-boot.version}<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>version</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>type</span><span class="token punctuation">></span></span>pom<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>type</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>scope</span><span class="token punctuation">></span></span>import<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>scope</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependency</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependencies</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependencyManagement</span><span class="token punctuation">></span></span>
请注意：不要引入spring-boot-starter-web包，会导致Gateway启动抛出异常
Spring Gateway支持两种方式提供路由服务，其一是配置文件启用，其二则是通过代码达到目的
-
application.yml配置实现
spring:
application:
name: xxxx
cloud:
consul:
host: localhost
port: 8500
discovery:
enabled: true
instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${server.port}
service-name: xxxx
prefer-ip-address: true
gateway:
discovery:
locator:
enabled: true
routes:
# This route rule used to forward request to activity server
- id: activity-route
uri: lb://activity
predicates:
- Path=/activity/**
filters:
- StripPrefix=1
注意：Gateway默认转发是全路径的，设置StripPrefix=1表示从二级url路径转发，即http://localhost:port/activity/test将会转发到http://{activity}/test
- 代码实现
@Bean
public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
return builder.routes()
.route(r -> r.path("/activity/**")
.filters(f -> f.stripPrefix(1).filter(new TestGetWayFilter()).addResponseHeader("X-Response-Default-Foo", "Default-Bar"))
.uri("lb://activity")
.order(0)
.id("activity-route")
)
.build();
}