前面咱们对Spring Cloud Gateway进行了一个入门的学习,具体文章能够查看《Spring Cloud Gateway 网关尝鲜》进行学习。git
网关负责转发工做,那么它须要知道后端的服务信息,今天咱们来学习下Spring Cloud Gateway 整合Eureka的操做,实现服务转发功能。github
在以前的基础上添加eureka-client的依赖:spring
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
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下面就是配置具体的转发规则了,这边须要注意下的是uri的配置:express
server:
port: 8084
spring:
cloud:
gateway:
routes:
- id: fsh-house
uri: lb://fsh-house
predicates:
- Path=/house/**
application:
name: fangjia-gateway
eureka:
instance:
prefer-ip-address: true
client:
service-url:
defaultZone: http://yinjihuan:123456@master:8761/eureka/
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uri以lb://开头(lb表明从注册中心获取服务),后面接的就是你须要转发到的服务名称,这个服务名称必须跟eureka中的对应,不然会找不到服务,错误以下:后端
org.springframework.cloud.gateway.support.NotFoundException: Unable to find instance for fsh-house1
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若是引入了spring-cloud-starter-netflix-eureka-client包,但你不想整合Eureka,也能够经过下面的配置关闭:bash
eureka.client.enabled=false
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说完了直接配置路由的方式,咱们来讲说不配置的方式也能转发,有用过Zuul的同窗确定都知道,Zuul默认会为全部服务都进行转发操做,只须要在访问路径上指定要访问的服务便可,经过这种方式就不用为每一个服务都去配置转发规则,当新加了服务的时候,不用去配置路由规则和重启网关。app
在Spring Cloud Gateway中固然也有这样的功能,只须要经过配置便可开启,配置以下:学习
spring.cloud.gateway.discovery.locator.enabled=true
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开启以后咱们就能够经过地址去访问服务了,格式以下:lua
http://网关地址/服务名称(大写)/**
http://localhost:8084/FSH-HOUSE/house/1
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这个大写的名称仍是有很大的影响,若是咱们从Zull升级到Spring Cloud Gateway的话意味着请求地址有改变,或者从新配置每一个服务的路由地址,经过源码我发现能够作到兼容处理,再增长一个配置便可:url
spring.cloud.gateway.discovery.locator.lowerCaseServiceId=true
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配置完成以后咱们就能够经过小写的服务名称进行访问了,以下:
http://网关地址/服务名称(小写)/**
http://localhost:8084/fsh-house/house/1
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配置源码:org.springframework.cloud.gateway.discovery.DiscoveryLocatorProperties
@ConfigurationProperties("spring.cloud.gateway.discovery.locator")
public class DiscoveryLocatorProperties {
/** Flag that enables DiscoveryClient gateway integration */
private boolean enabled = false;
/**
* The prefix for the routeId, defaults to discoveryClient.getClass().getSimpleName() + "_".
* Service Id will be appended to create the routeId.
*/
private String routeIdPrefix;
/**
* SpEL expression that will evaluate whether to include a service in gateway integration or not,
* defaults to: true
*/
private String includeExpression = "true";
/** SpEL expression that create the uri for each route, defaults to: 'lb://'+serviceId */
private String urlExpression = "'lb://'+serviceId";
/**
* Option to lower case serviceId in predicates and filters, defaults to false.
* Useful with eureka when it automatically uppercases serviceId.
* so MYSERIVCE, would match /myservice/**
*/
private boolean lowerCaseServiceId = false;
private List<PredicateDefinition> predicates = new ArrayList<>();
private List<FilterDefinition> filters = new ArrayList<>();
}
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文章源码参考地址: https://github.com/yinjihuan/spring-cloud/tree/master/fangjia-gateway