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Spring Cloud Eureka 注册与发现操作步骤详解

在搭建spring cloud eureka环境前先要了解整个架构的组成，常用的基础模式如下图：

服务提供者：将springboot服务编写好以后，通过配置注册中心地址方式注册，提供给消费者使用。
注册中心：服务的中间桥梁，服务提供者将服务注册。服务消费者可以通过注册信息调用需要使用的服务。
服务消费者：通过规定的调用方式，读取注册中心的注册信息，调用相应的服务。

根据后续的服务复杂度进化以后，可以看到服务提供者也可以是服务消费者，服务消费者也可以是服务提供者。根据不同的业务情况是可以互相调用的。

下面来搭建一个基础的eureka。环境还是使用的之前的spring官方下载的。

内容写的比较详细，可以跟这一步步操作。

一、注册中心



以下是几个需要修改和添加的地方，后面会有完整的pom.xml

 

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<parent>

         <groupid>org.springframework.boot</groupid>

         <artifactid>spring-boot-starter-parent</artifactid>

         <version> 2.1 . 3 .release</version>

         <relativepath /> <!-- lookup parent from repository -->

     </parent>

     <dependencymanagement>

         <dependencies>

             <dependency>

                 <groupid>org.springframework.cloud</groupid>

                 <artifactid>spring-cloud-dependencies</artifactid>

                 <version>finchley.sr2</version>

                 <type>pom</type>

                 <scope> import </scope>

             </dependency>

         </dependencies>

     </dependencymanagement>

<!-- 最新版的 eureka 服务端包 -->

         <dependency>

             <groupid>org.springframework.cloud</groupid>

             <artifactid>spring-cloud-starter-netflix-eureka-server</artifactid>

         </dependency>

 

         <!-- 监控管理 -->

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter-actuator</artifactid>

         </dependency>

spring cloud spring boot
angel版本 兼容spring boot 1.2.x
brixton版本 兼容spring boot 1.3.x，也兼容spring boot 1.4.x
camden版本 兼容spring boot 1.4.x，也兼容spring boot 1.5.x
dalston版本、edgware版本 兼容spring boot 1.5.x，不兼容spring boot 2.0.x
finchley版本 兼容spring boot 2.0.x，不兼容spring boot 1.5.x
greenwich版本 兼容spring boot 2.1.x

这里采用finchley.sr2版本 springboot版本改成 2.1.3.release

完整的pom.xml

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<?xml version= "1.0" encoding= "utf-8" ?>

<project xmlns= "http://maven.apache.org/pom/4.0.0"

     xmlns:xsi= "http://HdhCmsTestw3.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> 2.1 . 3 .release</version>

         <relativepath /> <!-- lookup parent from repository -->

     </parent>

     <groupid>com.example</groupid>

     <artifactid>eureka1</artifactid>

     <version> 0.0 . 1 -snapshot</version>

     <name>eureka1</name>

     <description>demo project for spring boot</description>

 

     <properties>

         <java.version> 1.8 </java.version>

     </properties>

     <dependencymanagement>

         <dependencies>

             <dependency>

                 <groupid>org.springframework.cloud</groupid>

                 <artifactid>spring-cloud-dependencies</artifactid>

                 <version>finchley.sr2</version>

                 <type>pom</type>

                 <scope> import </scope>

             </dependency>

         </dependencies>

     </dependencymanagement>

     <dependencies>

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter</artifactid>

         </dependency>

         <!-- 最新版的 eureka 服务端包 -->

         <dependency>

             <groupid>org.springframework.cloud</groupid>

             <artifactid>spring-cloud-starter-netflix-eureka-server</artifactid>

         </dependency>

 

         <!-- 监控管理 -->

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter-actuator</artifactid>

         </dependency>

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter-test</artifactid>

             <scope>test</scope>

             <exclusions>

                 <exclusion>

                     <groupid>org.junit.vintage</groupid>

                     <artifactid>junit-vintage-engine</artifactid>

                 </exclusion>

             </exclusions>

         </dependency>

     </dependencies>

 

     <build>

         <plugins>

             <plugin>

                 <groupid>org.springframework.boot</groupid>

                 <artifactid>spring-boot-maven-plugin</artifactid>

             </plugin>

         </plugins>

     </build>

 

</project>

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package com.example.demo;

 

import org.springframework.boot.springapplication;

import org.springframework.boot.autoconfigure.springbootapplication;

import org.springframework.cloud.netflix.eureka.server.enableeurekaserver;

 

@enableeurekaserver

@springbootapplication

public class eureka1application {

 

     public static void main(string[] args) {

         springapplication.run(eureka1application. class , args);

     }

 

}

然后在代码文件中添加@enableeurekaserver注解

修改application.yml文件

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server:

  port: 3000 # 端口

eureka:

  instance:

  hostname: eureka-center

  appname: 注册中心

  client:

  registerwitheureka: false # 单点的时候设置为 false 禁止注册自身

  fetchregistry: false

  serviceurl:

  defaultzone: http: //localhost:3000/eureka

  server:

  enableselfpreservation: false

  evictionintervaltimerinms: 4000

启动服务

浏览器输入 http://127.0.0.1:3000

证明注册中心搭建成功了

二、服务提供者

前面的步骤一样

providercontroller是新建的一个服务代码

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<dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter-test</artifactid>

             <scope>test</scope>

         </dependency>

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter-web</artifactid>

         </dependency>

         <!-- eureka 客户端 -->

         <dependency>

             <groupid>org.springframework.cloud</groupid>

             <artifactid>spring-cloud-starter-netflix-eureka-client</artifactid>

         </dependency>

不同的地方有加了一个spring-boot-starter-web和spring-cloud-starter-netflix-eureka-client客户端
完整的pom.xml

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<?xml version= "1.0" encoding= "utf-8" ?>

<project xmlns= "http://maven.apache.org/pom/4.0.0"

     xmlns:xsi= "http://HdhCmsTestw3.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> 2.1 . 3 .release</version>

         <relativepath /> <!-- lookup parent from repository -->

     </parent>

     <groupid>com.example</groupid>

     <artifactid>eurekaclient1</artifactid>

     <version> 0.0 . 1 -snapshot</version>

     <name>eurekaclient1</name>

     <description>demo project for spring boot</description>

 

     <properties>

         <java.version> 1.8 </java.version>

     </properties>

     <dependencymanagement>

         <dependencies>

             <dependency>

                 <groupid>org.springframework.cloud</groupid>

                 <artifactid>spring-cloud-dependencies</artifactid>

                 <version>finchley.sr2</version>

                 <type>pom</type>

                 <scope> import </scope>

             </dependency>

         </dependencies>

     </dependencymanagement>

     <dependencies>

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter</artifactid>

         </dependency>

 

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter-test</artifactid>

             <scope>test</scope>

         </dependency>

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter-web</artifactid>

         </dependency>

         <!-- eureka 客户端 -->

         <dependency>

             <groupid>org.springframework.cloud</groupid>

             <artifactid>spring-cloud-starter-netflix-eureka-client</artifactid>

         </dependency>

     </dependencies>

 

     <build>

         <plugins>

             <plugin>

                 <groupid>org.springframework.boot</groupid>

                 <artifactid>spring-boot-maven-plugin</artifactid>

             </plugin>

         </plugins>

     </build>

 

</project>

eurekaclient1application

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package com.example.demo;

 

import org.springframework.boot.springapplication;

import org.springframework.boot.autoconfigure.springbootapplication;

import org.springframework.cloud.netflix.eureka.enableeurekaclient;

 

@enableeurekaclient

@springbootapplication

public class eurekaclient1application {

 

     public static void main(string[] args) {

         springapplication.run(eurekaclient1application. class , args);

     }

 

}

providercontroller

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package com.example.demo;

 

import org.springframework.web.bind.annotation.requestmapping;

import org.springframework.web.bind.annotation.restcontroller;

 

@restcontroller

public class providercontroller {

 

  @requestmapping (value = "/hello" )

  public string hello(){

 

  return "hello spring cloud!" ;

  }

 

  @requestmapping (value = "/nice" )

  public string nice(){

 

  return "nice to meet you!" ;

  }

}

application.yml

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server:

  port: 3001

 

eureka:

  instance:

  preferipaddress: true

  client:

  serviceurl:

  defaultzone: http: //localhost:3000/eureka ## 注册到 eureka

spring:

  application:

  name: single-provider ## 应用程序名称，后面会在消费者中用到

http://127.0.0.1:3001/hello

http://127.0.0.1:3000/

证明服务已经注册成功

三、服务消费者

前面还是同上

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<dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter-test</artifactid>

             <scope>test</scope>

         </dependency>

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter-web</artifactid>

         </dependency>

         <dependency>

             <groupid>org.springframework.cloud</groupid>

             <artifactid>spring-cloud-starter-openfeign</artifactid>

         </dependency>

         <!-- eureka 客户端 -->

         <dependency>

             <groupid>org.springframework.cloud</groupid>

             <artifactid>spring-cloud-starter-netflix-eureka-client</artifactid>

         </dependency>

 

pom.xml新增以上内容

完整pom.xml

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<?xml version= "1.0" encoding= "utf-8" ?>

<project xmlns= "http://maven.apache.org/pom/4.0.0"

     xmlns:xsi= "http://HdhCmsTestw3.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> 2.1 . 3 .release</version>

         <relativepath /> <!-- lookup parent from repository -->

     </parent>

     <groupid>com.example</groupid>

     <artifactid>eurekaclient1</artifactid>

     <version> 0.0 . 1 -snapshot</version>

     <name>eurekaclient1</name>

     <description>demo project for spring boot</description>

 

     <properties>

         <java.version> 1.8 </java.version>

     </properties>

     <dependencymanagement>

         <dependencies>

             <dependency>

                 <groupid>org.springframework.cloud</groupid>

                 <artifactid>spring-cloud-dependencies</artifactid>

                 <version>finchley.sr2</version>

                 <type>pom</type>

                 <scope> import </scope>

             </dependency>

         </dependencies>

     </dependencymanagement>

     <dependencies>

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter</artifactid>

         </dependency>

 

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter-test</artifactid>

             <scope>test</scope>

         </dependency>

         <dependency>

             <groupid>org.springframework.boot</groupid>

             <artifactid>spring-boot-starter-web</artifactid>

         </dependency>

         <dependency>

             <groupid>org.springframework.cloud</groupid>

             <artifactid>spring-cloud-starter-openfeign</artifactid>

         </dependency>

         <!-- eureka 客户端 -->

         <dependency>

             <groupid>org.springframework.cloud</groupid>

             <artifactid>spring-cloud-starter-netflix-eureka-client</artifactid>

         </dependency>

     </dependencies>

 

     <build>

         <plugins>

             <plugin>

                 <groupid>org.springframework.boot</groupid>

                 <artifactid>spring-boot-maven-plugin</artifactid>

             </plugin>

         </plugins>

     </build>

 

</project>

eurekaclient2application

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package com.example.demo;

 

import org.springframework.boot.springapplication;

import org.springframework.boot.autoconfigure.springbootapplication;

import org.springframework.cloud.client.loadbalancer.loadbalanced;

import org.springframework.cloud.netflix.eureka.enableeurekaclient;

import org.springframework.cloud.openfeign.enablefeignclients;

import org.springframework.context.annotation.bean;

import org.springframework.web.client.resttemplate;

 

@enableeurekaclient

@enablefeignclients

@springbootapplication

public class eurekaclient2application {

 

     /**

  * 注入 resttemplate

  * 并用 @loadbalanced 注解，用负载均衡策略请求服务提供者

  * 这是 spring ribbon 的提供的能力

  * @return

  */

  @loadbalanced

  @bean

  public resttemplate resttemplate() {

  return new resttemplate(); //用于调用服务对象

  }

    

     public static void main(string[] args) {

         springapplication.run(eurekaclient2application. class , args);

     }

 

}

consumercontroller

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package com.example.demo;

 

import org.springframework.beans.factory.annotation.autowired;

import org.springframework.web.bind.annotation.requestmapping;

import org.springframework.web.bind.annotation.restcontroller;

import org.springframework.web.client.resttemplate;

 

@restcontroller

public class consumercontroller {

     @autowired

  private resttemplate resttemplate;

 

  private static final string applicationname = "single-provider" ; //服务注册名

 

  @requestmapping (value = "commonrequest" )

  public object commonrequest(){

  string url = "http://" + applicationname + "/hello" ;

  string s = resttemplate.getforobject(url,string. class ); //ribbon方式调用服务

  return s;

  }

}

application.yml

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server:

  port: 3002

eureka:

  client:

  serviceurl:

  defaultzone: http: //127.0.0.1:3000/eureka ## 注册到 eureka

  instance:

  preferipaddress: true

spring:

  application:

  name: single-customer

启动服务
http://127.0.0.1:3002/commonrequest

返回服务提供者的 hello方法参数。

整个最简单的过程就完成了，需要更好的使用spring cloud 后续需要了解分布式、负载均衡、熔断等概念。在后续章节将一步步的拆分。

到此这篇关于spring cloud eureka 注册与发现操作步骤详解的文章就介绍到这了,更多相关spring cloud eureka 注册内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持！

原文链接：https://blog.csdn.net/terry711/article/details/111519711

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