本文为joshua317原创文章,转载请注明：转载自joshua317博客 https://www.joshua317.com/article/153
一、问题
在配置eureka客户端的时候，设定好eureka客户端的简单配置，配置如下：
server:
port: 8081
error:
path: ./logs/error
eureka:
client:
service-url:
default-zone: http://eureka.joshua317.com/eureka/
结果运行后，报了以下错误：
. ____ _ __ _ _
/\ / ___'_ __ _ _(_)_ __ __ _
( ( )\___ | '_ | '_| | '_ / _` |
\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.5.5)
2021-09-29 15:55:00.825 INFO 12672 --- [ main] com.joshua317.demo.DemoApplication : Starting DemoApplication using Java 1.8.0_281 on joshua with PID 12672 (E:javademo argetclasses started by joshua317 in E:javademo)
2021-09-29 15:55:00.827 INFO 12672 --- [ main] com.joshua317.demo.DemoApplication : The following profiles are active: dev
2021-09-29 15:55:01.465 INFO 12672 --- [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=77e68b99-4210-3ba6-ae6f-308380a46828
2021-09-29 15:55:01.696 INFO 12672 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8081 (http)
2021-09-29 15:55:01.705 INFO 12672 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-09-29 15:55:01.706 INFO 12672 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.53]
2021-09-29 15:55:01.829 INFO 12672 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-09-29 15:55:01.829 INFO 12672 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 966 ms
2021-09-29 15:55:05.597 INFO 12672 --- [ main] DiscoveryClientOptionalArgsConfiguration : Eureka HTTP Client uses RestTemplate.
2021-09-29 15:55:08.935 WARN 12672 --- [ main] iguration$LoadBalancerCaffeineWarnLogger : Spring Cloud LoadBalancer is currently working with the default cache. You can switch to using Caffeine cache, by adding it and org.springframework.cache.caffeine.CaffeineCacheManager to the classpath.
2021-09-29 15:55:08.991 INFO 12672 --- [ main] o.s.c.n.eureka.InstanceInfoFactory : Setting initial instance status as: STARTING
2021-09-29 15:55:09.020 INFO 12672 --- [ main] com.netflix.discovery.DiscoveryClient : Initializing Eureka in region us-east-1
2021-09-29 15:55:09.024 INFO 12672 --- [ main] c.n.d.s.r.aws.ConfigClusterResolver : Resolving eureka endpoints via configuration
2021-09-29 15:55:09.049 INFO 12672 --- [ main] com.netflix.discovery.DiscoveryClient : Disable delta property : false
2021-09-29 15:55:09.049 INFO 12672 --- [ main] com.netflix.discovery.DiscoveryClient : Single vip registry refresh property : null
2021-09-29 15:55:09.050 INFO 12672 --- [ main] com.netflix.discovery.DiscoveryClient : Force full registry fetch : false
2021-09-29 15:55:09.050 INFO 12672 --- [ main] com.netflix.discovery.DiscoveryClient : Application is null : false
2021-09-29 15:55:09.050 INFO 12672 --- [ main] com.netflix.discovery.DiscoveryClient : Registered Applications size is zero : true
2021-09-29 15:55:09.050 INFO 12672 --- [ main] com.netflix.discovery.DiscoveryClient : Application version is -1: true
2021-09-29 15:55:09.050 INFO 12672 --- [ main] com.netflix.discovery.DiscoveryClient : Getting all instance registry info from the eureka server
2021-09-29 15:55:15.705 INFO 12672 --- [ main] c.n.d.s.t.d.RedirectingEurekaHttpClient : Request execution error. endpoint=DefaultEndpoint{ serviceUrl='http://localhost:8761/eureka/}, exception=I/O error on GET request for "http://localhost:8761/eureka/apps/": Connect to localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect; nested exception is org.apache.http.conn.HttpHostConnectException: Connect to localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect stacktrace=org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://localhost:8761/eureka/apps/": Connect to localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect; nested exception is org.apache.http.conn.HttpHostConnectException: Connect to localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:785)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:711)
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:602)
at org.springframework.cloud.netflix.eureka.http.RestTemplateEurekaHttpClient.getApplicationsInternal(RestTemplateEurekaHttpClient.java:145)
at org.springframework.cloud.netflix.eureka.http.RestTemplateEurekaHttpClient.getApplications(RestTemplateEurekaHttpClient.java:135)
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137)
at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.executeOnNewServer(RedirectingEurekaHttpClient.java:121)
at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:80)
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134)
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137)
at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:120)
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134)
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137)
at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77)
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134)
at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1101)
at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:1014)
at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:441)
at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:283)
at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:279)
at org.springframework.cloud.netflix.eureka.CloudEurekaClient.<init>(CloudEurekaClient.java:66)
at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.eurekaClient(EurekaClientAutoConfiguration.java:295)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$1(AbstractBeanFactory.java:374)
at org.springframework.cloud.context.scope.GenericScope$BeanLifecycleWrapper.getBean(GenericScope.java:376)
at org.springframework.cloud.context.scope.GenericScope.get(GenericScope.java:179)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:371)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35)
at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaRegistration.getTargetObject(EurekaRegistration.java:127)
at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaRegistration.getEurekaClient(EurekaRegistration.java:115)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:282)
at org.springframework.cloud.context.scope.GenericScope$LockedScopedProxyFactoryBean.invoke(GenericScope.java:485)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:692)
at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaRegistration$$EnhancerBySpringCGLIB$$dd5063c0.getEurekaClient(<generated>)
at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaServiceRegistry.maybeInitializeClient(EurekaServiceRegistry.java:54)
at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaServiceRegistry.register(EurekaServiceRegistry.java:38)
at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaAutoServiceRegistration.start(EurekaAutoServiceRegistration.java:83)
at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178)
at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54)
at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356)
at java.lang.Iterable.forEach(Iterable.java:75)
at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155)
at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332)
at com.joshua317.demo.DemoApplication.main(DemoApplication.java:10)
Caused by: org.apache.http.conn.HttpHostConnectException: Connect to localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:156)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:376)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:393)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
at org.springframework.http.client.HttpComponentsClientHttpRequest.executeInternal(HttpComponentsClientHttpRequest.java:87)
at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48)
at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:66)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:776)
... 68 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:75)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:476)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:218)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:200)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:162)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:394)
at java.net.Socket.connect(Socket.java:606)
at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75)
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
... 81 more
看了下报错信息，主要原因是没有获取到配置里面的eureka服务eureka.service-url，而是走了eureka默认的服务地址http://localhost:8761/eureka/，然后默认的的确没有这个服务，就导致报错
2021-09-29 15:55:15.705 INFO 12672 --- [ main] c.n.d.s.t.d.RedirectingEurekaHttpClient : Request execution error. endpoint=DefaultEndpoint{ serviceUrl='http://localhost:8761/eureka/}, exception=I/O error on GET request for "http://localhost:8761/eureka/apps/": Connect to localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect; nested exception is org.apache.http.conn.HttpHostConnectException: Connect to localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect stacktrace=org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://localhost:8761/eureka/apps/": Connect to localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect; nested exception is org.apache.http.conn.HttpHostConnectException: Connect to localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect
Caused by: org.apache.http.conn.HttpHostConnectException: Connect to localhost:8761 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect
但是为什么没有获取到配置里面的地址，而走了默认的服务地址呢？接下来我们来看看是何原因呢？
二、版本说明
首先说明下此次出现问题的软件版本说明
Spring Boot: v2.5.5
Spring Cloud: 2020.0.4
jdk:1.8
pom.xml文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.5</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.joshua317</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>2020.0.4</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
三、解决
为了避免问题分析过程繁琐，先说解决方案，把问题解决后再去看原理
方案一：
把配置里面的default-zone换成defaultZone
server:
port: 8081
error:
path: ./logs/error
eureka:
client:
service-url:
defaultZone: http://eureka.joshua317.com/eureka/
方案二：
指定eureka.client.region，eureka.client.availability-zones等属性值
server:
port: 8081
error:
path: ./logs/error
eureka:
client:
region: default
availability-zones:
default: default-zone
service-url:
default-zone: http://eureka.joshua317.com/eureka/
其中，eureka.client.region属性可理解为是地理上的分区，比如北京，上海这种,或者可以自定义，一个服务只能属于一个Region；
eureka.client.availability-zones属性就是可用的Zone的集合，Zone表示一个区域，常用于实现不同网络分区的实例配置，已实现负载均衡的区域亲和性。一个Region可以包含多个Zone
eureka.client.service-url属性就是服务的url，eureka的服务地址
比如我们可以如下配置,设置多个zone，每个zone对应一个eureka服务地址
server:
port: 8081
error:
path: ./logs/error
eureka:
client:
region: beijing
availability-zones:
beijing: beijing-zone1,beijing-zone2,beijing-zone3
service-url:
beijing-zone1: http://eureka-server1:8761/eureka/
beijing-zone2: http://eureka-server2:8762/eureka/
beijing-zone2: http://eureka-server3:8763/eureka/
具体使用哪个方案，可根据我们项目的实际情况进行选择
拓展：
eureka.instance.lease-renewal-interval-in-seconds控制心跳周期间隔时间,如：eureka.instance.lease-renewal-interval-in-seconds=30；
eureka.instance.lease-expiration-duration-in-seconds控制服务时效的时间，指定距离最后一次心跳时间多少秒后未续约，则让注册中心剔除实例（需要同时关闭保护模式才能使过期节点被剔除），如：
eureka.instance.lease-expiration-duration-in-seconds=120
四、问题分析
我们第一部分问题的时候提到配置没有获取到，没有生效，既然问题源于配置文件没有生效，那么Spring Boot是如何加载配置的呢eureka.clinet的配置文件呢?现在我们来分析下eureka客户端获取配置的原理。
我们通过ctrl+shift+N搜索下eureka相关的文件，找到EurekaClientConfig，可以看到是一个interface接口文件,看下这个文件的内容
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//
package com.netflix.discovery;
import com.google.inject.ImplementedBy;
import com.netflix.discovery.shared.transport.EurekaTransportConfig;
import java.util.List;
import javax.annotation.Nullable;
@ImplementedBy(DefaultEurekaClientConfig.class)
public interface EurekaClientConfig {
int getRegistryFetchIntervalSeconds();
int getInstanceInfoReplicationIntervalSeconds();
int getInitialInstanceInfoReplicationIntervalSeconds();
int getEurekaServiceUrlPollIntervalSeconds();
String getProxyHost();
String getProxyPort();
String getProxyUserName();
String getProxyPassword();
/** @deprecated */
boolean shouldGZipContent();
int getEurekaServerReadTimeoutSeconds();
int getEurekaServerConnectTimeoutSeconds();
String getBackupRegistryImpl();
int getEurekaServerTotalConnections();
int getEurekaServerTotalConnectionsPerHost();
String getEurekaServerURLContext();
String getEurekaServerPort();
String getEurekaServerDNSName();
boolean shouldUseDnsForFetchingServiceUrls();
boolean shouldRegisterWithEureka();
default boolean shouldUnregisterOnShutdown() {
return true;
}
boolean shouldPreferSameZoneEureka();
boolean allowRedirects();
boolean shouldLogDeltaDiff();
boolean shouldDisableDelta();
@Nullable
String fetchRegistryForRemoteRegions();
String getRegion();
String[] getAvailabilityZones(String var1);
List<String> getEurekaServerServiceUrls(String var1);
boolean shouldFilterOnlyUpInstances();
int getEurekaConnectionIdleTimeoutSeconds();
boolean shouldFetchRegistry();
default boolean shouldEnforceFetchRegistryAtInit() {
return false;
}
@Nullable
String getRegistryRefreshSingleVipAddress();
int getHeartbeatExecutorThreadPoolSize();
int getHeartbeatExecutorExponentialBackOffBound();
int getCacheRefreshExecutorThreadPoolSize();
int getCacheRefreshExecutorExponentialBackOffBound();
String getDollarReplacement();
String getEscapeCharReplacement();
boolean shouldOnDemandUpdateStatusChange();
default boolean shouldEnforceRegistrationAtInit() {
return false;
}
String getEncoderName();
String getDecoderName();
String getClientDataAccept();
String getExperimental(String var1);
EurekaTransportConfig getTransportConfig();
}
通过查看，发现有一个List对象的方法：getEurekaServerServiceUrls
我们看下是哪个类实现了这个接口，经查找EurekaClientConfigBean类实现了该接口的方法
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//
package org.springframework.cloud.netflix.eureka;
import com.netflix.appinfo.EurekaAccept;
import com.netflix.discovery.EurekaClientConfig;
import com.netflix.discovery.shared.transport.EurekaTransportConfig;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.NestedConfigurationProperty;
import org.springframework.core.Ordered;
import org.springframework.core.env.PropertyResolver;
import org.springframework.util.StringUtils;
@ConfigurationProperties("eureka.client")
public class EurekaClientConfigBean implements EurekaClientConfig, Ordered {
public static final String PREFIX = "eureka.client";
public static final String DEFAULT_URL = "http://localhost:8761/eureka/";
public static final String DEFAULT_ZONE = "defaultZone";
private static final int MINUTES = 60;
@Autowired(
required = false
)
PropertyResolver propertyResolver;
private boolean enabled = true;
@NestedConfigurationProperty
private EurekaTransportConfig transport = new CloudEurekaTransportConfig();
private int registryFetchIntervalSeconds = 30;
private int instanceInfoReplicationIntervalSeconds = 30;
private int initialInstanceInfoReplicationIntervalSeconds = 40;
private int eurekaServiceUrlPollIntervalSeconds = 300;
private String proxyPort;
private String proxyHost;
private String proxyUserName;
private String proxyPassword;
private int eurekaServerReadTimeoutSeconds = 8;
private int eurekaServerConnectTimeoutSeconds = 5;
private String backupRegistryImpl;
private int eurekaServerTotalConnections = 200;
private int eurekaServerTotalConnectionsPerHost = 50;
private String eurekaServerURLContext;
private String eurekaServerPort;
private String eurekaServerDNSName;
private String region = "us-east-1";
private int eurekaConnectionIdleTimeoutSeconds = 30;
private String registryRefreshSingleVipAddress;
private int heartbeatExecutorThreadPoolSize = 2;
private int heartbeatExecutorExponentialBackOffBound = 10;
private int cacheRefreshExecutorThreadPoolSize = 2;
private int cacheRefreshExecutorExponentialBackOffBound = 10;
private Map<String, String> serviceUrl = new HashMap();
private boolean gZipContent;
private boolean useDnsForFetchingServiceUrls;
private boolean registerWithEureka;
private boolean preferSameZoneEureka;
private boolean logDeltaDiff;
private boolean disableDelta;
private String fetchRemoteRegionsRegistry;
private Map<String, String> availabilityZones;
private boolean filterOnlyUpInstances;
private boolean fetchRegistry;
private String dollarReplacement;
private String escapeCharReplacement;
private boolean allowRedirects;
private boolean onDemandUpdateStatusChange;
private String encoderName;
private String decoderName;
private String clientDataAccept;
private boolean shouldUnregisterOnShutdown;
private boolean shouldEnforceRegistrationAtInit;
private int order;
public EurekaClientConfigBean() {
this.serviceUrl.put("defaultZone", "http://localhost:8761/eureka/");
this.gZipContent = true;
this.useDnsForFetchingServiceUrls = false;
this.registerWithEureka = true;
this.preferSameZoneEureka = true;
this.availabilityZones = new HashMap();
this.filterOnlyUpInstances = true;
this.fetchRegistry = true;
this.dollarReplacement = "_-";
this.escapeCharReplacement = "__";
this.allowRedirects = false;
this.onDemandUpdateStatusChange = true;
this.clientDataAccept = EurekaAccept.full.name();
this.shouldUnregisterOnShutdown = true;
this.shouldEnforceRegistrationAtInit = false;
this.order = 0;
}
public boolean shouldGZipContent() {
return this.gZipContent;
}
public boolean shouldUseDnsForFetchingServiceUrls() {
return this.useDnsForFetchingServiceUrls;
}
public boolean shouldRegisterWithEureka() {
return this.registerWithEureka;
}
public boolean shouldPreferSameZoneEureka() {
return this.preferSameZoneEureka;
}
public boolean shouldLogDeltaDiff() {
return this.logDeltaDiff;
}
public boolean shouldDisableDelta() {
return this.disableDelta;
}
public boolean shouldUnregisterOnShutdown() {
return this.shouldUnregisterOnShutdown;
}
public boolean shouldEnforceRegistrationAtInit() {
return this.shouldEnforceRegistrationAtInit;
}
public String fetchRegistryForRemoteRegions() {
return this.fetchRemoteRegionsRegistry;
}
public String[] getAvailabilityZones(String region) {
String value = (String)this.availabilityZones.get(region);
if (value == null) {
value = "defaultZone";
}
return value.split(",");
}
public List<String> getEurekaServerServiceUrls(String myZone) {
String serviceUrls = (String)this.serviceUrl.get(myZone);
if (serviceUrls == null || serviceUrls.isEmpty()) {
serviceUrls = (String)this.serviceUrl.get("defaultZone");
}
if (!StringUtils.isEmpty(serviceUrls)) {
String[] serviceUrlsSplit = StringUtils.commaDelimitedListToStringArray(serviceUrls);
List<String> eurekaServiceUrls = new ArrayList(serviceUrlsSplit.length);
String[] var5 = serviceUrlsSplit;
int var6 = serviceUrlsSplit.length;
for(int var7 = 0; var7 < var6; ++var7) {
String eurekaServiceUrl = var5[var7];
if (!this.endsWithSlash(eurekaServiceUrl)) {
eurekaServiceUrl = eurekaServiceUrl + "/";
}
eurekaServiceUrls.add(eurekaServiceUrl.trim());
}
return eurekaServiceUrls;
} else {
return new ArrayList();
}
}
private boolean endsWithSlash(String url) {
return url.endsWith("/");
}
public boolean shouldFilterOnlyUpInstances() {
return this.filterOnlyUpInstances;
}
public boolean shouldFetchRegistry() {
return this.fetchRegistry;
}
public boolean allowRedirects() {
return this.allowRedirects;
}
public boolean shouldOnDemandUpdateStatusChange() {
return this.onDemandUpdateStatusChange;
}
public String getExperimental(String name) {
return this.propertyResolver != null ? (String)this.propertyResolver.getProperty("eureka.client.experimental." + name, String.class, (Object)null) : null;
}
public EurekaTransportConfig getTransportConfig() {
return this.getTransport();
}
public PropertyResolver getPropertyResolver() {
return this.propertyResolver;
}
public void setPropertyResolver(PropertyResolver propertyResolver) {
this.propertyResolver = propertyResolver;
}
public boolean isEnabled() {
return this.enabled;
}
public void setEnabled(boolean enabled) {
this.enabled = enabled;
}
public EurekaTransportConfig getTransport() {
return this.transport;
}
public void setTransport(EurekaTransportConfig transport) {
this.transport = transport;
}
public int getRegistryFetchIntervalSeconds() {
return this.registryFetchIntervalSeconds;
}
public void setRegistryFetchIntervalSeconds(int registryFetchIntervalSeconds) {
this.registryFetchIntervalSeconds = registryFetchIntervalSeconds;
}
public int getInstanceInfoReplicationIntervalSeconds() {
return this.instanceInfoReplicationIntervalSeconds;
}
public void setInstanceInfoReplicationIntervalSeconds(int instanceInfoReplicationIntervalSeconds) {
this.instanceInfoReplicationIntervalSeconds = instanceInfoReplicationIntervalSeconds;
}
public int getInitialInstanceInfoReplicationIntervalSeconds() {
return this.initialInstanceInfoReplicationIntervalSeconds;
}
public void setInitialInstanceInfoReplicationIntervalSeconds(int initialInstanceInfoReplicationIntervalSeconds) {
this.initialInstanceInfoReplicationIntervalSeconds = initialInstanceInfoReplicationIntervalSeconds;
}
public int getEurekaServiceUrlPollIntervalSeconds() {
return this.eurekaServiceUrlPollIntervalSeconds;
}
public void setEurekaServiceUrlPollIntervalSeconds(int eurekaServiceUrlPollIntervalSeconds) {
this.eurekaServiceUrlPollIntervalSeconds = eurekaServiceUrlPollIntervalSeconds;
}
public String getProxyPort() {
return this.proxyPort;
}
public void setProxyPort(String proxyPort) {
this.proxyPort = proxyPort;
}
public String getProxyHost() {
return this.proxyHost;
}
public void setProxyHost(String proxyHost) {
this.proxyHost = proxyHost;
}
public String getProxyUserName() {
return this.proxyUserName;
}
public void setProxyUserName(String proxyUserName) {
this.proxyUserName = proxyUserName;
}
public String getProxyPassword() {
return this.proxyPassword;
}
public void setProxyPassword(String proxyPassword) {
this.proxyPassword = proxyPassword;
}
public int getEurekaServerReadTimeoutSeconds() {
return this.eurekaServerReadTimeoutSeconds;
}
public void setEurekaServerReadTimeoutSeconds(int eurekaServerReadTimeoutSeconds) {
this.eurekaServerReadTimeoutSeconds = eurekaServerReadTimeoutSeconds;
}
public int getEurekaServerConnectTimeoutSeconds() {
return this.eurekaServerConnectTimeoutSeconds;
}
public void setEurekaServerConnectTimeoutSeconds(int eurekaServerConnectTimeoutSeconds) {
this.eurekaServerConnectTimeoutSeconds = eurekaServerConnectTimeoutSeconds;
}
public String getBackupRegistryImpl() {
return this.backupRegistryImpl;
}
public void setBackupRegistryImpl(String backupRegistryImpl) {
this.backupRegistryImpl = backupRegistryImpl;
}
public int getEurekaServerTotalConnections() {
return this.eurekaServerTotalConnections;
}
public void setEurekaServerTotalConnections(int eurekaServerTotalConnections) {
this.eurekaServerTotalConnections = eurekaServerTotalConnections;
}
public int getEurekaServerTotalConnectionsPerHost() {
return this.eurekaServerTotalConnectionsPerHost;
}
public void setEurekaServerTotalConnectionsPerHost(int eurekaServerTotalConnectionsPerHost) {
this.eurekaServerTotalConnectionsPerHost = eurekaServerTotalConnectionsPerHost;
}
public String getEurekaServerURLContext() {
return this.eurekaServerURLContext;
}
public void setEurekaServerURLContext(String eurekaServerURLContext) {
this.eurekaServerURLContext = eurekaServerURLContext;
}
public String getEurekaServerPort() {
return this.eurekaServerPort;
}
public void setEurekaServerPort(String eurekaServerPort) {
this.eurekaServerPort = eurekaServerPort;
}
public String getEurekaServerDNSName() {
return this.eurekaServerDNSName;
}
public void setEurekaServerDNSName(String eurekaServerDNSName) {
this.eurekaServerDNSName = eurekaServerDNSName;
}
public String getRegion() {
return this.region;
}
public void setRegion(String region) {
this.region = region;
}
public int getEurekaConnectionIdleTimeoutSeconds() {
return this.eurekaConnectionIdleTimeoutSeconds;
}
public void setEurekaConnectionIdleTimeoutSeconds(int eurekaConnectionIdleTimeoutSeconds) {
this.eurekaConnectionIdleTimeoutSeconds = eurekaConnectionIdleTimeoutSeconds;
}
public String getRegistryRefreshSingleVipAddress() {
return this.registryRefreshSingleVipAddress;
}
public void setRegistryRefreshSingleVipAddress(String registryRefreshSingleVipAddress) {
this.registryRefreshSingleVipAddress = registryRefreshSingleVipAddress;
}
public int getHeartbeatExecutorThreadPoolSize() {
return this.heartbeatExecutorThreadPoolSize;
}
public void setHeartbeatExecutorThreadPoolSize(int heartbeatExecutorThreadPoolSize) {
this.heartbeatExecutorThreadPoolSize = heartbeatExecutorThreadPoolSize;
}
public int getHeartbeatExecutorExponentialBackOffBound() {
return this.heartbeatExecutorExponentialBackOffBound;
}
public void setHeartbeatExecutorExponentialBackOffBound(int heartbeatExecutorExponentialBackOffBound) {
this.heartbeatExecutorExponentialBackOffBound = heartbeatExecutorExponentialBackOffBound;
}
public int getCacheRefreshExecutorThreadPoolSize() {
return this.cacheRefreshExecutorThreadPoolSize;
}
public void setCacheRefreshExecutorThreadPoolSize(int cacheRefreshExecutorThreadPoolSize) {
this.cacheRefreshExecutorThreadPoolSize = cacheRefreshExecutorThreadPoolSize;
}
public int getCacheRefreshExecutorExponentialBackOffBound() {
return this.cacheRefreshExecutorExponentialBackOffBound;
}
public void setCacheRefreshExecutorExponentialBackOffBound(int cacheRefreshExecutorExponentialBackOffBound) {
this.cacheRefreshExecutorExponentialBackOffBound = cacheRefreshExecutorExponentialBackOffBound;
}
public Map<String, String> getServiceUrl() {
return this.serviceUrl;
}
public void setServiceUrl(Map<String, String> serviceUrl) {
this.serviceUrl = serviceUrl;
}
public boolean isgZipContent() {
return this.gZipContent;
}
public void setgZipContent(boolean gZipContent) {
this.gZipContent = gZipContent;
}
public boolean isUseDnsForFetchingServiceUrls() {
return this.useDnsForFetchingServiceUrls;
}
public void setUseDnsForFetchingServiceUrls(boolean useDnsForFetchingServiceUrls) {
this.useDnsForFetchingServiceUrls = useDnsForFetchingServiceUrls;
}
public boolean isRegisterWithEureka() {
return this.registerWithEureka;
}
public void setRegisterWithEureka(boolean registerWithEureka) {
this.registerWithEureka = registerWithEureka;
}
public boolean isPreferSameZoneEureka() {
return this.preferSameZoneEureka;
}
public void setPreferSameZoneEureka(boolean preferSameZoneEureka) {
this.preferSameZoneEureka = preferSameZoneEureka;
}
public boolean isLogDeltaDiff() {
return this.logDeltaDiff;
}
public void setLogDeltaDiff(boolean logDeltaDiff) {
this.logDeltaDiff = logDeltaDiff;
}
public boolean isDisableDelta() {
return this.disableDelta;
}
public void setDisableDelta(boolean disableDelta) {
this.disableDelta = disableDelta;
}
public String getFetchRemoteRegionsRegistry() {
return this.fetchRemoteRegionsRegistry;
}
public void setFetchRemoteRegionsRegistry(String fetchRemoteRegionsRegistry) {
this.fetchRemoteRegionsRegistry = fetchRemoteRegionsRegistry;
}
public Map<String, String> getAvailabilityZones() {
return this.availabilityZones;
}
public void setAvailabilityZones(Map<String, String> availabilityZones) {
this.availabilityZones = availabilityZones;
}
public boolean isFilterOnlyUpInstances() {
return this.filterOnlyUpInstances;
}
public void setFilterOnlyUpInstances(boolean filterOnlyUpInstances) {
this.filterOnlyUpInstances = filterOnlyUpInstances;
}
public boolean isFetchRegistry() {
return this.fetchRegistry;
}
public void setFetchRegistry(boolean fetchRegistry) {
this.fetchRegistry = fetchRegistry;
}
public String getDollarReplacement() {
return this.dollarReplacement;
}
public void setDollarReplacement(String dollarReplacement) {
this.dollarReplacement = dollarReplacement;
}
public String getEscapeCharReplacement() {
return this.escapeCharReplacement;
}
public void setEscapeCharReplacement(String escapeCharReplacement) {
this.escapeCharReplacement = escapeCharReplacement;
}
public boolean isAllowRedirects() {
return this.allowRedirects;
}
public void setAllowRedirects(boolean allowRedirects) {
this.allowRedirects = allowRedirects;
}
public boolean isOnDemandUpdateStatusChange() {
return this.onDemandUpdateStatusChange;
}
public void setOnDemandUpdateStatusChange(boolean onDemandUpdateStatusChange) {
this.onDemandUpdateStatusChange = onDemandUpdateStatusChange;
}
public String getEncoderName() {
return this.encoderName;
}
public void setEncoderName(String encoderName) {
this.encoderName = encoderName;
}
public String getDecoderName() {
return this.decoderName;
}
public void setDecoderName(String decoderName) {
this.decoderName = decoderName;
}
public String getClientDataAccept() {
return this.clientDataAccept;
}
public void setClientDataAccept(String clientDataAccept) {
this.clientDataAccept = clientDataAccept;
}
public boolean isShouldUnregisterOnShutdown() {
return this.shouldUnregisterOnShutdown;
}
public void setShouldUnregisterOnShutdown(boolean shouldUnregisterOnShutdown) {
this.shouldUnregisterOnShutdown = shouldUnregisterOnShutdown;
}
public boolean isShouldEnforceRegistrationAtInit() {
return this.shouldEnforceRegistrationAtInit;
}
public void setShouldEnforceRegistrationAtInit(boolean shouldEnforceRegistrationAtInit) {
this.shouldEnforceRegistrationAtInit = shouldEnforceRegistrationAtInit;
}
public int getOrder() {
return this.order;
}
public void setOrder(int order) {
this.order = order;
}
public boolean equals(Object o) {
if (this == o) {
return true;
} else if (o != null && this.getClass() == o.getClass()) {
EurekaClientConfigBean that = (EurekaClientConfigBean)o;
return Objects.equals(this.propertyResolver, that.propertyResolver) && this.enabled == that.enabled && Objects.equals(this.transport, that.transport) && this.registryFetchIntervalSeconds == that.registryFetchIntervalSeconds && this.instanceInfoReplicationIntervalSeconds == that.instanceInfoReplicationIntervalSeconds && this.initialInstanceInfoReplicationIntervalSeconds == that.initialInstanceInfoReplicationIntervalSeconds && this.eurekaServiceUrlPollIntervalSeconds == that.eurekaServiceUrlPollIntervalSeconds && this.eurekaServerReadTimeoutSeconds == that.eurekaServerReadTimeoutSeconds && this.eurekaServerConnectTimeoutSeconds == that.eurekaServerConnectTimeoutSeconds && this.eurekaServerTotalConnections == that.eurekaServerTotalConnections && this.eurekaServerTotalConnectionsPerHost == that.eurekaServerTotalConnectionsPerHost && this.eurekaConnectionIdleTimeoutSeconds == that.eurekaConnectionIdleTimeoutSeconds && this.heartbeatExecutorThreadPoolSize == that.heartbeatExecutorThreadPoolSize && this.heartbeatExecutorExponentialBackOffBound == that.heartbeatExecutorExponentialBackOffBound && this.cacheRefreshExecutorThreadPoolSize == that.cacheRefreshExecutorThreadPoolSize && this.cacheRefreshExecutorExponentialBackOffBound == that.cacheRefreshExecutorExponentialBackOffBound && this.gZipContent == that.gZipContent && this.useDnsForFetchingServiceUrls == that.useDnsForFetchingServiceUrls && this.registerWithEureka == that.registerWithEureka && this.preferSameZoneEureka == that.preferSameZoneEureka && this.logDeltaDiff == that.logDeltaDiff && this.disableDelta == that.disableDelta && this.filterOnlyUpInstances == that.filterOnlyUpInstances && this.fetchRegistry == that.fetchRegistry && this.allowRedirects == that.allowRedirects && this.onDemandUpdateStatusChange == that.onDemandUpdateStatusChange && this.shouldUnregisterOnShutdown == that.shouldUnregisterOnShutdown && this.shouldEnforceRegistrationAtInit == that.shouldEnforceRegistrationAtInit && Objects.equals(this.proxyPort, that.proxyPort) && Objects.equals(this.proxyHost, that.proxyHost) && Objects.equals(this.proxyUserName, that.proxyUserName) && Objects.equals(this.proxyPassword, that.proxyPassword) && Objects.equals(this.backupRegistryImpl, that.backupRegistryImpl) && Objects.equals(this.eurekaServerURLContext, that.eurekaServerURLContext) && Objects.equals(this.eurekaServerPort, that.eurekaServerPort) && Objects.equals(this.eurekaServerDNSName, that.eurekaServerDNSName) && Objects.equals(this.region, that.region) && Objects.equals(this.registryRefreshSingleVipAddress, that.registryRefreshSingleVipAddress) && Objects.equals(this.serviceUrl, that.serviceUrl) && Objects.equals(this.fetchRemoteRegionsRegistry, that.fetchRemoteRegionsRegistry) && Objects.equals(this.availabilityZones, that.availabilityZones) && Objects.equals(this.dollarReplacement, that.dollarReplacement) && Objects.equals(this.escapeCharReplacement, that.escapeCharReplacement) && Objects.equals(this.encoderName, that.encoderName) && Objects.equals(this.decoderName, that.decoderName) && Objects.equals(this.clientDataAccept, that.clientDataAccept) && Objects.equals(this.order, that.order);
} else {
return false;
}
}
public int hashCode() {
return Objects.hash(new Object[]{this.propertyResolver, this.enabled, this.transport, this.registryFetchIntervalSeconds, this.instanceInfoReplicationIntervalSeconds, this.initialInstanceInfoReplicationIntervalSeconds, this.eurekaServiceUrlPollIntervalSeconds, this.proxyPort, this.proxyHost, this.proxyUserName, this.proxyPassword, this.eurekaServerReadTimeoutSeconds, this.eurekaServerConnectTimeoutSeconds, this.backupRegistryImpl, this.eurekaServerTotalConnections, this.eurekaServerTotalConnectionsPerHost, this.eurekaServerURLContext, this.eurekaServerPort, this.eurekaServerDNSName, this.region, this.eurekaConnectionIdleTimeoutSeconds, this.registryRefreshSingleVipAddress, this.heartbeatExecutorThreadPoolSize, this.heartbeatExecutorExponentialBackOffBound, this.cacheRefreshExecutorThreadPoolSize, this.cacheRefreshExecutorExponentialBackOffBound, this.serviceUrl, this.gZipContent, this.useDnsForFetchingServiceUrls, this.registerWithEureka, this.preferSameZoneEureka, this.logDeltaDiff, this.disableDelta, this.fetchRemoteRegionsRegistry, this.availabilityZones, this.filterOnlyUpInstances, this.fetchRegistry, this.dollarReplacement, this.escapeCharReplacement, this.allowRedirects, this.onDemandUpdateStatusChange, this.encoderName, this.decoderName, this.clientDataAccept, this.shouldUnregisterOnShutdown, this.shouldEnforceRegistrationAtInit, this.order});
}
public String toString() {
return "EurekaClientConfigBean{" + "propertyResolver=" + this.propertyResolver + ", " + "enabled=" + this.enabled + ", " + "transport=" + this.transport + ", " + "registryFetchIntervalSeconds=" + this.registryFetchIntervalSeconds + ", " + "instanceInfoReplicationIntervalSeconds=" + this.instanceInfoReplicationIntervalSeconds + ", " + "initialInstanceInfoReplicationIntervalSeconds=" + this.initialInstanceInfoReplicationIntervalSeconds + ", " + "eurekaServiceUrlPollIntervalSeconds=" + this.eurekaServiceUrlPollIntervalSeconds + ", " + "proxyPort='" + this.proxyPort + "', " + "proxyHost='" + this.proxyHost + "', " + "proxyUserName='" + this.proxyUserName + "', " + "proxyPassword='" + this.proxyPassword + "', " + "eurekaServerReadTimeoutSeconds=" + this.eurekaServerReadTimeoutSeconds + ", " + "eurekaServerConnectTimeoutSeconds=" + this.eurekaServerConnectTimeoutSeconds + ", " + "backupRegistryImpl='" + this.backupRegistryImpl + "', " + "eurekaServerTotalConnections=" + this.eurekaServerTotalConnections + ", " + "eurekaServerTotalConnectionsPerHost=" + this.eurekaServerTotalConnectionsPerHost + ", " + "eurekaServerURLContext='" + this.eurekaServerURLContext + "', " + "eurekaServerPort='" + this.eurekaServerPort + "', " + "eurekaServerDNSName='" + this.eurekaServerDNSName + "', " + "region='" + this.region + "', " + "eurekaConnectionIdleTimeoutSeconds=" + this.eurekaConnectionIdleTimeoutSeconds + ", " + "registryRefreshSingleVipAddress='" + this.registryRefreshSingleVipAddress + "', " + "heartbeatExecutorThreadPoolSize=" + this.heartbeatExecutorThreadPoolSize + ", " + "heartbeatExecutorExponentialBackOffBound=" + this.heartbeatExecutorExponentialBackOffBound + ", " + "cacheRefreshExecutorThreadPoolSize=" + this.cacheRefreshExecutorThreadPoolSize + ", " + "cacheRefreshExecutorExponentialBackOffBound=" + this.cacheRefreshExecutorExponentialBackOffBound + ", " + "serviceUrl=" + this.serviceUrl + ", " + "gZipContent=" + this.gZipContent + ", " + "useDnsForFetchingServiceUrls=" + this.useDnsForFetchingServiceUrls + ", " + "registerWithEureka=" + this.registerWithEureka + ", " + "preferSameZoneEureka=" + this.preferSameZoneEureka + ", " + "logDeltaDiff=" + this.logDeltaDiff + ", " + "disableDelta=" + this.disableDelta + ", " + "fetchRemoteRegionsRegistry='" + this.fetchRemoteRegionsRegistry + "', " + "availabilityZones=" + this.availabilityZones + ", " + "filterOnlyUpInstances=" + this.filterOnlyUpInstances + ", " + "fetchRegistry=" + this.fetchRegistry + ", " + "dollarReplacement='" + this.dollarReplacement + "', " + "escapeCharReplacement='" + this.escapeCharReplacement + "', " + "allowRedirects=" + this.allowRedirects + ", " + "onDemandUpdateStatusChange=" + this.onDemandUpdateStatusChange + ", " + "encoderName='" + this.encoderName + "', " + "decoderName='" + this.decoderName + "', " + "clientDataAccept='" + this.clientDataAccept + "', " + "shouldUnregisterOnShutdown='" + this.shouldUnregisterOnShutdown + "shouldEnforceRegistrationAtInit='" + this.shouldEnforceRegistrationAtInit + "', " + "order='" + this.order + "'}";
}
}
接下来，我们断点看一下，发现myZone的值为defaultZone而不是default-zone，有两个serviceUrl,分别是default-zone和defaultZone
default-zone -> http://eureka.joshua317.com/eureka/
defaultZone -> http://localhost:8761/eureka/
在没有制定region的情况下，会使用defaultZone从ServiceUrl中查询Eureka Server的URL列表,所以使用代码默认初始化的地址http://localhost:8761/eureka/，所以出现了上面的错误。
具体为什么呢，我们接着往下走，进入到了EndpointUtils类中的getServiceUrlsMapFromConfig,我们可以看到region为us-east-1默认值
instanceZone="defaultZone"
region="us-east-1"
zone="defaultZone"
availZones[myZoneOffset]="defaultZone"
因为没有在yml配置region属性，所以才使用了默认us-east-1,并且availabilityZones为空。所以myZone使用的是默认是值defaultZone,详情见getZone()方法。
然后我们继续追代码，找到了类ConfigClusterResolver的getClusterEndpointsFromConfig方法，在这里面我们可以看到myZone的获取
那有人可能会问为什么service-url就可以呢，我们在EurekaClientConfigBean类中setServiceUrl方法处断点看下
在EurekaClientConfigBean调用sercviceUrl之前，先经过 BeanProperty.setValue()处理了， 并且beanProperty对象的setter方法正好sercviceUrl，而BeanProperty的属性name是service-url这和我们的配置文件是一样的。
五、总结
在我们配置文件写入配置的过程中，属性里面的一些键名是驼峰，还是中划线，主要看我们底层代码实现是如何处理的，我们可以通过断点追代码进行排查分析。
本文为joshua317原创文章,转载请注明：转载自joshua317博客 https://www.joshua317.com/article/153