之前我們講了注冊(cè)中心,也就是Eureka Server的使用,我們來講一下服務(wù)注冊(cè),Eureka Client的使用,基本上第一件事就是把Eureka Server給啟動(dòng)起來nohup java -jar eureka-0.0.1-SNAPSHOT.jar &10.40.8.152:8761這就方便了不用每次都去啟動(dòng)它kill -9 4681我們要把一個(gè)應(yīng)用注冊(cè)到一個(gè)應(yīng)用中心去,那你要往哪個(gè)地址注冊(cè),你總得配置一下,不然我怎么知道往哪注冊(cè)呢,eureka.client.serviceUrl.defaultZone=http://admin:1234@localhost:8761/eureka在啟動(dòng)類上加注解@EnableEurekaClient@EnableEurekaClient @SpringBootApplication public class ClientApplication {public static void main(String[] args) {SpringApplication.run(ClientApplication.class, args);} }@Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented @Inherited @EnableDiscoveryClient public @interface EnableEurekaClient {}奇怪的是這個(gè)應(yīng)用名怎么叫UNKNOWN,我們來改一下名字spring.application.name=client這就是修改應(yīng)用的名字有的時(shí)候我們希望點(diǎn)過來是另外一個(gè)地址,他不是這個(gè)IP,這個(gè)我們?cè)趺醋龅阶远x呢http://10.40.8.144:7900/info配置里面有這么一個(gè)屬性eureka.instance.hostname=clientNameemergency! eureka may be incorrectly claiming instances are up when they're not. renewals are lesser than threshold and hence the instances are not being expired just to be safe.如果你不停的重啟,會(huì)導(dǎo)致一個(gè)什么問題呢,可能會(huì)出現(xiàn)一串警告了,Eureka Server端和這些應(yīng)用,Client端他們采用的是心跳的機(jī)制,Server端會(huì)不停的去檢查,Client端是否還存活,那么他會(huì)在一定的時(shí)間統(tǒng)計(jì)出來,上線率,就是一個(gè)比例,定義某個(gè)比例的時(shí)候呢,就會(huì)爆出這么一個(gè)警告,意思就是說,你這個(gè)client上線率太低了,可能我都不知道你是上線還是下線,那么怎么辦呢,那么我就當(dāng)做你是上線,就是寧可信其有,不可信其無,這其實(shí)是他的一種自我保護(hù)的模式,當(dāng)然在開發(fā)環(huán)境,可以把它給關(guān)掉,避免你以后要來調(diào)用這個(gè)微服務(wù)的時(shí)候,這上面展示的在線,實(shí)際上他已經(jīng)是下線狀態(tài)了,所以開發(fā)環(huán)境我們最好給他關(guān)掉eureka.server.enableSelfPreservation=false這個(gè)配置你只能在開發(fā)環(huán)境把它關(guān)閉,生產(chǎn)環(huán)境一定不要這么來設(shè)置,你要往哪個(gè)注冊(cè)地址去注冊(cè),你要配置上的,配置完了啟動(dòng)了,其實(shí)還是不能注冊(cè)上去,你要在啟動(dòng)主類上加上注解@EnableEurekaClient,然后再看看我們的配置,你如果有需要的話呢,可以加上,給他起一個(gè)別名,另外應(yīng)用的名字你最好給他寫上,不然應(yīng)用的名字顯示的就是UNKNOWN,Eureka Server的自我保護(hù),開發(fā)環(huán)境你可以把它給關(guān)閉,這樣方便以后我們做微服務(wù)的調(diào)用,不會(huì)出錯(cuò) <?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 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.learn</groupId><artifactId>client</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><parent><groupId>cn.learn</groupId><artifactId>microcloud02</artifactId><version>0.0.1</version></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version><thymeleaf.version>3.0.9.RELEASE</thymeleaf.version><thymeleaf-layout-dialect.version>2.2.2</thymeleaf-layout-dialect.version></properties><dependencies><!-- Spring Boot進(jìn)行單元測(cè)試的模塊 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</artifactId></dependency></dependencies><!-- 這個(gè)插件,可以將應(yīng)用打包成一個(gè)可執(zhí)行的jar包 --><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project> <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 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>cn.learn</groupId><artifactId>microcloud02</artifactId><version>0.0.1</version><packaging>pom</packaging><name>microcloud02</name><url>http://maven.apache.org</url><!-- <modules><module>microservice-hystrix-dashboard</module></modules> --><properties><jdk.version>1.8</jdk.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencyManagement><dependencies><dependency> <groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Dalston.SR1</version><type>pom</type><scope>import</scope></dependency><dependency> <!-- SpringCloud離不開SpringBoot，所以必須要配置此依賴包 --><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>1.5.12.RELEASE</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><!-- <build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><executions><execution><goals><goal>repackage</goal></goals></execution></executions></plugin></plugins></build> --></project> #debug=true server.port=7900logging.level.com.learn=trace logging.file=springboot.log logging.pattern.console=%d{yyyy-MM-dd} [%thread] %-5level %logger{50} - %msg%n logging.pattern.file=%d{yyyy-MM-dd} ==== [%thread] %-5level ==== %logger{50} ==== %msg%neureka.client.serviceUrl.defaultZone=http://admin:1234@10.40.8.152:8761/eurekaspring.application.name=client eureka.instance.prefer-ip-address=true eureka.instance.instance-id=${spring.application.name}:${spring.cloud.client.ipAddress}:${spring.application.instance_id:${server.port}} #eureka.instance.hostname=clientName package com.learn.cloud;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@EnableEurekaClient @SpringBootApplication public class ClientApplication {public static void main(String[] args) {SpringApplication.run(ClientApplication.class, args);} }

?

總結(jié)

以上是生活随笔為你收集整理的Eureka Client的使用的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。