SpringCloud源碼分析（一）--註冊中心搭建
1、前言java
目前微服務能夠說至關的火，不少公司都開始了擁抱互聯網，都開始採用或者計劃採用微服務，無論是國內阿里巴巴的開源的dubbo仍是spring cloud都是微服務開發中的翹楚，爲微服務的流行提供了很好的平臺，減小了技術壁壘，就如當年spring興起同樣。本篇系列文章主要記錄本身在學習spring cloud過程當中的一些知識，包括一些用法、源碼解析，做爲本身學習記錄和知識的總結。可是本身能力有限，不可避免出現各類問題或者理解不對的地方，但願各位能夠多多指教。spring
2、使用的版本apache
spring cloud的全家桶包括的內容不少，得益於各個社區的支持，其對應的版本更新的也比較快，它是基於spring boot的，本文使用相對較新的spring boot版本是2.0.6.RELEASE，配套的spring-cloud的版本是Finchley.SR1。頗有可能各個版本的源碼邏輯不太一致。api
3、spring cloud的搭建app
一、各位能夠自行參靠如何搭建spring boot的工程。socket
二、pom文件maven
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 3 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4 <modelVersion>4.0.0</modelVersion> 5 6 <groupId>com.zxy.springcloud</groupId> 7 <artifactId>eurekaserver</artifactId> 8 <version>0.0.1-SNAPSHOT</version> 9 <packaging>jar</packaging> 10 11 <name>eurekaserver</name> 12 <description>Demo project for Spring Boot</description> 13 14 <parent> 15 <groupId>org.springframework.boot</groupId> 16 <artifactId>spring-boot-starter-parent</artifactId> 17 <version>2.0.6.RELEASE</version> 18 <relativePath/> <!-- lookup parent from repository --> 19 </parent> 20 21 <properties> 22 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 23 <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 24 <java.version>1.8</java.version> 25 <spring-cloud.version>Finchley.SR1</spring-cloud.version> 26 </properties> 27 28 <dependencies> 29 <dependency> 30 <groupId>org.springframework.cloud</groupId> 31 <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> 32 </dependency> 33 <dependency> 34 <groupId>org.springframework.boot</groupId> 35 <artifactId>spring-boot-starter-actuator</artifactId> 36 </dependency> 37 <dependency> 38 <groupId>org.springframework.boot</groupId> 39 <artifactId>spring-boot-starter-test</artifactId> 40 <scope>test</scope> 41 </dependency> 42 </dependencies> 43 44 <dependencyManagement> 45 <dependencies> 46 <dependency> 47 <groupId>org.springframework.cloud</groupId> 48 <artifactId>spring-cloud-dependencies</artifactId> 49 <version>${spring-cloud.version}</version> 50 <type>pom</type> 51 <scope>import</scope> 52 </dependency> 53 </dependencies> 54 </dependencyManagement> 55 56 <build> 57 <plugins> 58 <plugin> 59 <groupId>org.springframework.boot</groupId> 60 <artifactId>spring-boot-maven-plugin</artifactId> 61 </plugin> 62 </plugins> 63 </build> 64 65 66 </project>
三、運行工程spring-boot
在啓動類上加上一個註解@EnableEurekaServer，啓動工程就能夠將此工程做爲一個服務註冊中心了，無需添加任何配置微服務
1 @SpringBootApplication 2 @EnableEurekaServer 3 public class EurekaserverApplication { 4 5 public static void main(String[] args) { 6 SpringApplication.run(EurekaserverApplication.class, args); 7 } 8 }
四、程序出錯post
在運行過程當中，控制檯報了錯誤
1 com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect 2 at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.1.jar:1.19.1] 3 at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123) ~[jersey-client-1.19.1.jar:1.19.1] 4 at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27) ~[eureka-client-1.9.3.jar:1.9.3] 5 at com.sun.jersey.api.client.Client.handle(Client.java:652) ~[jersey-client-1.19.1.jar:1.19.1] 6 at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682) ~[jersey-client-1.19.1.jar:1.19.1] 7 at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74) ~[jersey-client-1.19.1.jar:1.19.1] 8 at com.sun.jersey.api.client.WebResource$Builder.post(WebResource.java:570) ~[jersey-client-1.19.1.jar:1.19.1] 9 at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.register(AbstractJerseyEurekaHttpClient.java:56) ~[eureka-client-1.9.3.jar:1.9.3] 10 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.3.jar:1.9.3] 11 at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73) ~[eureka-client-1.9.3.jar:1.9.3] 12 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.3.jar:1.9.3] 13 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.3.jar:1.9.3] 14 at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.executeOnNewServer(RedirectingEurekaHttpClient.java:118) ~[eureka-client-1.9.3.jar:1.9.3] 15 at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:79) ~[eureka-client-1.9.3.jar:1.9.3] 16 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.3.jar:1.9.3] 17 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.3.jar:1.9.3] 18 at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:120) [eureka-client-1.9.3.jar:1.9.3] 19 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.3.jar:1.9.3] 20 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.3.jar:1.9.3] 21 at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) [eureka-client-1.9.3.jar:1.9.3] 22 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.3.jar:1.9.3] 23 at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:829) [eureka-client-1.9.3.jar:1.9.3] 24 at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) [eureka-client-1.9.3.jar:1.9.3] 25 at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:101) [eureka-client-1.9.3.jar:1.9.3] 26 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_144] 27 at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_144] 28 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_144] 29 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_144] 30 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_144] 31 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_144] 32 at java.lang.Thread.run(Thread.java:748) [na:1.8.0_144] 33 Caused by: java.net.ConnectException: Connection refused: connect 34 at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_144] 35 at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_144] 36 at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_144] 37 at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_144] 38 at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_144] 39 at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_144] 40 at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_144] 41 at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_144] 42 at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121) ~[httpclient-4.5.6.jar:4.5.6] 43 at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180) ~[httpclient-4.5.6.jar:4.5.6] 44 at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144) ~[httpclient-4.5.6.jar:4.5.6] 45 at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:134) ~[httpclient-4.5.6.jar:4.5.6] 46 at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:610) ~[httpclient-4.5.6.jar:4.5.6] 47 at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:445) ~[httpclient-4.5.6.jar:4.5.6] 48 at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835) ~[httpclient-4.5.6.jar:4.5.6] 49 at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:118) ~[httpclient-4.5.6.jar:4.5.6] 50 at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56) ~[httpclient-4.5.6.jar:4.5.6] 51 at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:173) ~[jersey-apache-client4-1.19.1.jar:1.19.1] 52 ... 30 common frames omitted 53 54 2018-11-11 16:40:48.334 WARN 9788 --- [nfoReplicator-0] c.n.d.s.t.d.RetryableEurekaHttpClient : Request execution failed with message: java.net.ConnectException: Connection refused: connect 55 2018-11-11 16:40:48.334 WARN 9788 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_UNKNOWN/DESKTOP-SMANTUI.mshome.net - registration failed Cannot execute request on any known server 56 57 com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server 58 at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:112) ~[eureka-client-1.9.3.jar:1.9.3] 59 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.3.jar:1.9.3] 60 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.9.3.jar:1.9.3] 61 at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.3.jar:1.9.3] 62 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.3.jar:1.9.3] 63 at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:829) ~[eureka-client-1.9.3.jar:1.9.3] 64 at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) [eureka-client-1.9.3.jar:1.9.3] 65 at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:101) [eureka-client-1.9.3.jar:1.9.3] 66 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_144] 67 at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_144] 68 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_144] 69 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_144] 70 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_144] 71 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_144] 72 at java.lang.Thread.run(Thread.java:748) [na:1.8.0_144] 73 74 2018-11-11 16:40:48.334 WARN 9788 --- [nfoReplicator-0] c.n.discovery.InstanceInfoReplicator : There was a problem with the instance info replicator 75 76 com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server 77 at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:112) ~[eureka-client-1.9.3.jar:1.9.3] 78 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.3.jar:1.9.3] 79 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.9.3.jar:1.9.3] 80 at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.3.jar:1.9.3] 81 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.3.jar:1.9.3] 82 at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:829) ~[eureka-client-1.9.3.jar:1.9.3] 83 at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) ~[eureka-client-1.9.3.jar:1.9.3] 84 at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:101) [eureka-client-1.9.3.jar:1.9.3] 85 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_144] 86 at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_144] 87 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_144] 88 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_144] 89 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_144] 90 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_144] 91 at java.lang.Thread.run(Thread.java:748) [na:1.8.0_144] 92 93 2018-11-11 16:41:16.117 INFO 9788 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Disable delta property : false 94 2018-11-11 16:41:16.118 INFO 9788 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Single vip registry refresh property : null 95 2018-11-11 16:41:16.118 INFO 9788 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Force full registry fetch : false 96 2018-11-11 16:41:16.118 INFO 9788 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Application is null : false 97 2018-11-11 16:41:16.118 INFO 9788 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Registered Applications size is zero : true 98 2018-11-11 16:41:16.118 INFO 9788 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Application version is -1: true 99 2018-11-11 16:41:16.118 INFO 9788 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Getting all instance registry info from the eureka server 100 2018-11-11 16:41:18.150 ERROR 9788 --- [tbeatExecutor-0] c.n.d.s.t.d.RedirectingEurekaHttpClient : Request execution error 101 102 com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect 103 at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.1.jar:1.19.1] 104 at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123) ~[jersey-client-1.19.1.jar:1.19.1] 105 at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27) ~[eureka-client-1.9.3.jar:1.9.3] 106 at com.sun.jersey.api.client.Client.handle(Client.java:652) ~[jersey-client-1.19.1.jar:1.19.1] 107 at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682) ~[jersey-client-1.19.1.jar:1.19.1] 108 at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74) ~[jersey-client-1.19.1.jar:1.19.1] 109 at com.sun.jersey.api.client.WebResource$Builder.put(WebResource.java:529) ~[jersey-client-1.19.1.jar:1.19.1] 110 at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.sendHeartBeat(AbstractJerseyEurekaHttpClient.java:102) ~[eureka-client-1.9.3.jar:1.9.3] 111 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$3.execute(EurekaHttpClientDecorator.java:92) [eureka-client-1.9.3.jar:1.9.3] 112 at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73) ~[eureka-client-1.9.3.jar:1.9.3] 113 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.sendHeartBeat(EurekaHttpClientDecorator.java:89) [eureka-client-1.9.3.jar:1.9.3] 114 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$3.execute(EurekaHttpClientDecorator.java:92) [eureka-client-1.9.3.jar:1.9.3] 115 at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.executeOnNewServer(RedirectingEurekaHttpClient.java:118) ~[eureka-client-1.9.3.jar:1.9.3] 116 at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:79) ~[eureka-client-1.9.3.jar:1.9.3] 117 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.sendHeartBeat(EurekaHttpClientDecorator.java:89) [eureka-client-1.9.3.jar:1.9.3] 118 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$3.execute(EurekaHttpClientDecorator.java:92) [eureka-client-1.9.3.jar:1.9.3] 119 at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:120) [eureka-client-1.9.3.jar:1.9.3] 120 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.sendHeartBeat(EurekaHttpClientDecorator.java:89) [eureka-client-1.9.3.jar:1.9.3] 121 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$3.execute(EurekaHttpClientDecorator.java:92) [eureka-client-1.9.3.jar:1.9.3] 122 at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) [eureka-client-1.9.3.jar:1.9.3] 123 at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.sendHeartBeat(EurekaHttpClientDecorator.java:89) [eureka-client-1.9.3.jar:1.9.3] 124 at com.netflix.discovery.DiscoveryClient.renew(DiscoveryClient.java:846) [eureka-client-1.9.3.jar:1.9.3] 125 at com.netflix.discovery.DiscoveryClient$HeartbeatThread.run(DiscoveryClient.java:1399) [eureka-client-1.9.3.jar:1.9.3] 126 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_144] 127 at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_144] 128 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_144] 129 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_144] 130 at java.lang.Thread.run(Thread.java:748) [na:1.8.0_144] 131 Caused by: java.net.ConnectException: Connection refused: connect 132 at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_144] 133 at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_144] 134 at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_144] 135 at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_144] 136 at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_144] 137 at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_144] 138 at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_144] 139 at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_144] 140 at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121) ~[httpclient-4.5.6.jar:4.5.6] 141 at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180) ~[httpclient-4.5.6.jar:4.5.6] 142 at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144) ~[httpclient-4.5.6.jar:4.5.6] 143 at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:134) ~[httpclient-4.5.6.jar:4.5.6] 144 at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:610) ~[httpclient-4.5.6.jar:4.5.6] 145 at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:445) ~[httpclient-4.5.6.jar:4.5.6] 146 at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835) ~[httpclient-4.5.6.jar:4.5.6] 147 at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:118) ~[httpclient-4.5.6.jar:4.5.6] 148 at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56) ~[httpclient-4.5.6.jar:4.5.6] 149 at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:173) ~[jersey-apache-client4-1.19.1.jar:1.19.1] 150 ... 27 common frames omitted
緣由是Eureka的服務自己分爲客戶端和服務端，對於註冊中心的服務端，其自己也是客戶端，其默認的配置有檢索服務和本身向本身註冊的機制，而且默認是開啓的。可是在客戶端向服務端註冊時，發現服務端自己並無啓動。spring cloud已經默認配置了一套配置，咱們不用配置就可使用。可是其服務註冊中心是可使用的，後期會從源碼角度分析其緣由
五、工程配置文件
1 #服務註冊中心端口號 2 server: 3 port: 8099 4 5 eureka: 6 instance: 7 #服務註冊中心實例的主機名 8 hostname: localhost 9 client: 10 #是否檢索服務 11 fetch-registry: false 12 #是否向服務註冊中心註冊本身 13 register-with-eureka: false 14 service-url: 15 #服務註冊中心的配置內容，指定服務註冊中心的位置 16 defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ 17 18 spring: 19 application: 20 name: eurka-server
添加配置文件，修改端口程序名和eureka的相關配置，再次啓動程序就能夠正常運行了。
到目前爲止，其實咱們就添加了一個註解和幾行配置，程序就能夠運行了，極其簡單和方便。
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