Spring WebClient和Eureka服务器

Question

spring webclient无法从eureka服务器的服务实例名称中检索实际主机，出现以下异常：

java.net.UnknownHostException: USER-DATA-SERVICE
    at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) ~[na:1.8.0_161]
    Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
    |_ checkpoint ⇢ Request to GET http://USER-DATA-SERVICE/users/01 [DefaultWebClient]

Spring启动版本：2.2.3。BUILD-SNAPSHOT

Answer 1

如果@Bhavesh的答案仍然不起作用，那么请确保将AddressResolver添加到httpClient。让我们看看如何：

首先，不要忘记在属性中添加IP地址的首选项：

eureka:
  instance:
    prefer-ip-address: true

使用ReactorHttpClient

import io.netty.resolver.DefaultAddressResolverGroup;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.reactive.ReactorClientHttpConnector;
import org.springframework.web.reactive.function.client.WebClient;
import reactor.netty.http.client.HttpClient;


@Configuration
public class WebClientConfig {

    @Bean
    public HttpClient httpClientReactor() {
        return HttpClient.create()
                .resolver(DefaultAddressResolverGroup.INSTANCE);
    }


    @Bean
    @LoadBalanced
    public WebClient.Builder loadBalancedWebClientBuilder(HttpClient httpClient) {

        return WebClient.builder().clientConnector(new ReactorClientHttpConnector(httpClient));
    }

}

Answer 2

我也面临同样的问题，但我发现web客户端实例创建方法中缺少了@Bean标记。如果正在旋转多个实例，也可以使用@LoadBalanced注释

在应用程序类中添加以下代码。

@Bean
@LoadBalanced
public WebClient.Builder getWebClient(){
    return WebClient.builder();
}

这应该可以解决错误，干杯！