在没有负载平衡器的情况下，按Application.Properties中的服务名称为@FeignClient提供URL

Question

我想使用Feign客户机，并按服务名称在application.properties中提供URL。

我使用Spring Boot，并且依赖于Spring Cloud：

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

@SpringBootApplication
@EnableFeignClients
public class MyApplication {
    public static void main(String[] args) { SpringApplication.run(MyApplication.class, args); }
}

@FeignClient(name = "some-service", url = "http://some-service.com/")
public interface SomeServiceClient {}

我知道如何对属性进行硬编码以从属性读取URL：

@FeignClient(name = "some-service", url = "${some-service.url}")
public interface SomeServiceClient {}

application.properties:

some-service.url=http://some-service.com/

这是一个更好的，但我想脱钩的财产名称与虚假客户端。我只想使用名称。

@FeignClient(name = "some-service")
public interface SomeServiceClient {}

some-service.ribbon.listOfServers=http://some-service.com/
ribbon.eureka.enabled=false

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

这个解决方案似乎更好，因为代码中的Feign客户机只包含名称（没有URL或URL的耦合属性名称）。这正是我想要的。

但在日志中，我看到Spring/Ribbon为我运行负载平衡器：

2020-11-03 23:39:01.832  INFO 12168 --- [nio-8080-exec-2] c.netflix.config.ChainedDynamicProperty  : Flipping property: some-service.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2020-11-03 23:39:01.892  INFO 12168 --- [nio-8080-exec-2] c.netflix.loadbalancer.BaseLoadBalancer  : Client: some-service instantiated a LoadBalancer: DynamicServerListLoadBalancer:{NFLoadBalancer:name=some-service,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:null
2020-11-03 23:39:01.908  INFO 12168 --- [nio-8080-exec-2] c.n.l.DynamicServerListLoadBalancer      : Using serverListUpdater PollingServerListUpdater
2020-11-03 23:39:01.955  INFO 12168 --- [nio-8080-exec-2] c.netflix.config.ChainedDynamicProperty  : Flipping property: some-service.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
2020-11-03 23:39:01.970  INFO 12168 --- [nio-8080-exec-2] c.n.l.DynamicServerListLoadBalancer      : DynamicServerListLoadBalancer for client some-service initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=some-service,current list of Servers=[jsonplaceholder.typicode.com:443],Load balancer stats=Zone stats: {unknown=[Zone:unknown;  Instance count:1;   Active connections count: 0;    Circuit breaker tripped count: 0;   Active connections per server: 0.0;]
},Server stats: [[Server:jsonplaceholder.typicode.com:443;  Zone:UNKNOWN;   Total Requests:0;   Successive connection failure:0;    Total blackout seconds:0;   Last connection made:Thu Jan 01 01:00:00 CET 1970;  First connection made: Thu Jan 01 01:00:00 CET 1970;    Active Connections:0;   total failure count in last (1000) msecs:0; average resp time:0.0;  90 percentile resp time:0.0;    95 percentile resp time:0.0;    min resp time:0.0;  max resp time:0.0;  stddev resp time:0.0]
]}ServerList:com.netflix.loadbalancer.ConfigurationBasedServerList@6a4bfe52

我不需要负载平衡器（我只有一个URL）。如何禁用它并始终获得ListofServers的第一个？也许有一种方法可以提供负载均衡器的自定义实现？或者至少为冗余负载均衡器禁用日志？

• https://cloud.spring.io/spring-cloud-netflix/multi/multi_spring-cloud-feign.html
• https://cloud.spring.io/spring-cloud-netflix/multi/multi_spring-cloud-ribbon.html

Answer 1

我也面临着同样的问题，您是否按照EnableFeignClients使Spring无法加载上下文中的建议尝试了以下操作？

spring.main.allow-bean-definition-overriding=true
feign.client.config.some-service.url=http://some-service.com/