SpringCloud - （一）Eureka服务注册与发现

悠悠 2022-05-26 05:51 227阅读 0赞

## Eureka ##

Spring Cloud Netflix的Eureka是一个服务注册和发现模块

## 项目总览 ##

项目结构  
![这里写图片描述][70]  
项目说明：

*  Ahut-Cloud：Maven主项目
 *  Ahut-Eureka-Server：eureka server项目
 *  Ahut-Eureka-Client-One：eureka client项目

## 创建Maven主项目 ##

点击File >> New >> Project  
![这里写图片描述][70 1]  
选择Maven，直接点击next  
![这里写图片描述][70 2]  
填写项目maven信息  
![这里写图片描述][70 3]  
填写项目名称和选择项目路径  
![这里写图片描述][70 4]  
创建完成  
![这里写图片描述][70 5]

## 创建Eureka Server项目 ##

选中项目>>右键，New>>Module  
![这里写图片描述][70 6]  
选择Spring Init，点击next  
![这里写图片描述][70 7]  
填写项目maven相关信息  
![这里写图片描述][70 8]  
选择Cloud Discovery>>勾选Eureka Server,选择SpringBoot版本(建议不要使用2.x)  
![这里写图片描述][70 9]  
填写项目名称  
![这里写图片描述][70 10]  
项目的pom.xml如下（不需要修改）：

<?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.ahut</groupId>
        <artifactId>ahut-eureka-server</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>ahut-eureka-server</name>
        <description>eureka server</description>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.12.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.SR3</spring-cloud.version>
        </properties>
    
        <dependencies>
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-eureka-server</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>

项目启动类，注意@EnableEurekaServer：

package com.ahut;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
    
    /** * @author cheng * @className: AhutEurekaServerApplication * @description: eureka server * @dateTime 2018/4/26 10:39 */
    @SpringBootApplication
    @EnableEurekaServer
    public class AhutEurekaServerApplication { 
    
        public static void main(String[] args) {
            SpringApplication.run(AhutEurekaServerApplication.class, args);
        }
    }

项目配置application.properties:

# 配置服务器端口
    server.port=8900
    # 配置eureka实例主机名
    eureka.instance.hostname=localhost
    # 表明是eureka server
    eureka.client.register-with-eureka=false
    eureka.client.fetch-registry=false
    # 设置默认的eureka server访问url
    # 默认情况下erureka server也是一个eureka client ,必须要指定一个 server
    eureka.client.service-url.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/

启动项目，浏览器访问（暂时还没有服务）：  
![这里写图片描述][70 11]

## 创建Eureka Client 项目 ##

创建过程和Eureka Client类似  
注意添加的是Eureka Discovery  
![这里写图片描述][70 12]

pom.xml:

<?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.ahut</groupId>
        <artifactId>eureka-client-one</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>eureka-client-one</name>
        <description>eureka client</description>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.12.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.SR3</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-web</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>

项目启动类，注意@EnableEurekaClient表明自己是一个eurekaclient：

package com.ahut;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    
    /** * @author cheng * @className: EurekaClientOneApplication * @description: eureka client * @dateTime 2018/4/26 10:48 */
    @SpringBootApplication
    @EnableEurekaClient
    public class EurekaClientOneApplication { 
    
        public static void main(String[] args) {
            SpringApplication.run(EurekaClientOneApplication.class, args);
        }
    }

创建一个demo action：

package com.ahut.action;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /** * @author cheng * @className: DemoAction * @description: 演示控制层 * @dateTime 2018/4/26 11:36 */
    @RestController
    @RequestMapping(value = "/v1")
    public class DemoAction { 
    
        @Value(value = "${server.port}")
        private String serverPort;
    
        /** * @description: 展示server port * @author cheng * @dateTime 2018/4/26 11:40 */
        @RequestMapping(value = "/showPort")
        public String showPort() {
            String msg = "hello,my server port is : " + serverPort;
            return msg;
        }
    
    }

项目配置文件application.properties：

# 配置服务器端口
    server.port=8910
    # 配置spring应用名称
    spring.application.name=AHUT-EUREKA-CLIENT
    # 注册服务
    eureka.client.service-url.defaultZone=http://localhost:8900/eureka/

启动项目，访问eureka server  
![这里写图片描述][70 13]

访问eureka client  
![这里写图片描述][70 14]

## 项目架构 ##

![这里写图片描述][70 15]

[70]: /images/20220526/dbc438b58e1d48788fcaf0eae968da13.png
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