Spring Cloud Gateway 1 基本使用

Spring Cloud Gateway 基本使用

maven依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</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-contract-stub-runner</artifactId>
   <exclusions>
      <exclusion>
         <artifactId>spring-boot-starter-web</artifactId>
         <groupId>org.springframework.boot</groupId>
      </exclusion>
   </exclusions>
</dependency>

spring 版本

Spring Boot 2.0.5.RELEASE

Spring Cloud Finchley.RELEASE

<parent>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-parent</artifactId>
   <version>2.0.5.RELEASE</version>
   <relativePath/>
</parent>
<properties>
   <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
   <java.version>1.8</java.version>
   <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
</properties>
<dependencyManagement>
   <dependencies>
      <dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-starter-parent</artifactId>
         <version>${spring-cloud.version}</version>
         <type>pom</type>
         <scope>import</scope>
      </dependency>
   </dependencies>
</dependencyManagement>

启动类注解

@SpringCloudApplication

yml配置

Spring Cloud Gateway 基于Eureak的服务发现弊端：通过网关转发服务调用，访问王福安的uri默认必须是大写，否则报404；
通过指定配置可以解决：spring.cloud.gateway.discovery.locator.owerCaseServiceId: true

以Zookeeper或Consul为注册中心，不会出现这个情况

这是基于Spring Cloud 的路由转发

spring:
  cloud:
    gateway:
      discovery:
        locator:
          enabled: false
          lowerCaseServiceId: true
      routes:
      - id: service-hi
        uri: lb://SERVICE-HI
        predicates:
          - Path=/demo/**
        filters:
          - StripPrefix=1

配置说明

spring.cloud.gateway.discovery.locator.enabled: false

是否与服务发现组件进行组合，通过serviceId转发到具体的服务实例。默认为false，若为true便开启基于服务发现的路由规则

spring.cloud.gateway.discovery.locator.lowerCaseServiceId: true

当注册中心为Eureka时,设置为true标识开启用小写的serviceId进行基于服务路由转发

以下是基于url转发

spring:
  cloud:
    gateway:
      routes:
      - id: before_route
        uri: https://example.org

也可以使用java代码来配置路由规则

 @Bean
    public RouteLocator customerRouteLocator(RouteLocatorBuilder builder) {
                .route(r -> r.path("/test/**")
                        .uri("http://localhost:8762/hi")
                        .id("rateLimit_route")
                )
                .build();
    }

如果java代码合yml配置同时存在，优先于java代码中的配置