服务注册与发现---eureka

短命女 2022-05-29 11:56 325阅读 0赞

eureka简介：云端服务发现，一个基于 REST 的服务，用于定位服务，以实现云端中间层服务发现和故障转移。

话不多说直接上代码

首先新建一个springcloud eurekaserver项目。  
pom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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    
    	<groupId>com.dalaoyang</groupId>
    	<artifactId>springcloud_eureka_server</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>springcloud_eureka_server</name>
    	<description>springcloud_eureka_server</description>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>1.5.9.RELEASE</version>
    		<relativePath/> 
    	</parent>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		<java.version>1.8</java.version>
    	</properties>
    
    	<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.cloud</groupId>
    			<artifactId>spring-cloud-starter-eureka-server</artifactId>
    		</dependency>
    	</dependencies>
    
    
    	<dependencyManagement>
    		<dependencies>
    			<dependency>
    				<groupId>org.springframework.cloud</groupId>
    				<artifactId>spring-cloud-dependencies</artifactId>
    				<version>Edgware.SR1</version>
    				<type>pom</type>
    				<scope>import</scope>
    			</dependency>
    		</dependencies>
    	</dependencyManagement>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
    
    
    </project>

然后在application.properties加入如下配置:

server.port=8761
    
    eureka.instance.hostname=localhost
    eureka.client.service-url.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/
    
    ##禁止自己向自己注册
    eureka.client.register-with-eureka=false
    eureka.client.fetch-registry=false

最后只需在启动类application上加入注解@EnableEurekaServer  
开启服务注册中心，然后启动项目，访问[http://localhost:8761/][http_localhost_8761]可以看到如下页面。

![1][]

下图可见当前并没有实例

![2][]

然后新建一个eureka-client项目，pom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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    
    	<groupId>com.dalaoyang</groupId>
    	<artifactId>springcloud_eureka_client</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>springcloud_eureka_client</name>
    	<description>springcloud_eureka_client</description>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>1.5.9.RELEASE</version>
    		<relativePath/> 
    	</parent>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		<java.version>1.8</java.version>
    		<spring-cloud.version>Edgware.SR1</spring-cloud.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.cloud</groupId>
    			<artifactId>spring-cloud-starter-eureka</artifactId>
    		</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>
    			</plugin>
    		</plugins>
    	</build>
    
    
    </project>

application.properties如下所示：

##端口号
    server.port=8762
    
    spring.application.name=eureka_client
    
    eureka.client.service-url.defaultZone=http://localhost:8761/eureka/

启动类appliction加入@EnableEurekaClient注解，application代码如下

package com.dalaoyang;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    
    @SpringBootApplication
    @EnableEurekaClient
    public class SpringcloudEurekaClientApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(SpringcloudEurekaClientApplication.class, args);
    	}
    }

启动eureka-client，在观察eurekaserver管理页面

![3][]

这时就可以看到一个实例已经注册成功了，服务名为EUREKA\_CLIENT ,端口为8762

源码下载 ：[大老杨码云][Link 1]

[http_localhost_8761]: http://localhost:8761/
[1]: /images/20220529/c070175ee6594e3d946c5baeb7dbbd3d.png
[2]: /images/20220529/64ea0337567c447294260534354a38a9.png
[3]: /images/20220529/ce91a757d79047f5b72ac4ad085a24df.png
[Link 1]: https://gitee.com/dalaoyang/springboot_learn