Spring Cloud（三）Eureka实战

矫情吗；* 2022-12-14 03:42 122阅读 0赞

前提：Spring Cloud版本为Finchley.RELEASE

![在这里插入图片描述][20201012223819412.png_pic_center]

**一、创建一个maven主工程**

项目名称：finchley

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.yi</groupId>
        <artifactId>finchley</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>finchley</name>
        <packaging>pom</packaging>
        <description>Spring Boot版本2.0.3.RELEASE,Spring Cloud版本为Finchley.RELEASE</description>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.3.RELEASE</version>
            <relativePath/>
        </parent>
    
        <modules>
            <module>eureka-server</module>
            <module>eureka-client1</module>
        </modules>
    
        <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>Finchley.RELEASE</spring-cloud.version>
        </properties>
    
        <dependencies>
            <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>

**二、创建服务注册中心，即Eureka Server**

项目名称：eureka-server

server:
      port: 8761
    
    eureka:
      instance:
        hostname: localhost   #eureka服务端的实例名称
      client:
        registerWithEureka: false   #false表示不向注册中心注册自己
        fetchRegistry: false    #false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务
        serviceUrl:   #设置与Eureka  单机
          defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
    
    spring:
      application:
        name: eureka-server

package com.yi.eurekaserver;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
    
    @SpringBootApplication
    @EnableEurekaServer
    public class EurekaServerApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(EurekaServerApplication.class, args);
        }
    
    }

> @EnableEurekaServer：表示这是一个eureka的服务端

启动工程,浏览器访问： `http://localhost:8761`

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70_pic_center]

**三、创建一个服务提供者 (eureka client)**

当client向server注册时，它会提供一些元数据，例如主机和端口，URL，主页等。Eureka server 从每个client实例接收心跳消息。 如果心跳超时，则通常将该实例从注册server中删除

项目名称：eureka-client1

server:
      port: 8762
    
    spring:
      application:
        name: service-client
    
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/

添加@EnableEurekaClient注解，并暴露服务

package com.yi.eurekaclient;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    @SpringBootApplication
    @EnableEurekaClient
    @RestController
    public class EurekaClient1Application {
    
        public static void main(String[] args) {
            SpringApplication.run(EurekaClient1Application.class, args);
        }
    
        @Value("${server.port}")
        String port;
    
        @RequestMapping("/hello")
        public String hello(@RequestParam(value = "name", defaultValue = "yi") String name) {
            return "hello " + name + " ，port is  " + port;
        }
    
    }

> @EnableEurekaClient ：表明是一个eureka client

访问：`http://localhost:8761/`，发现一个服务已经注册在服务中了，服务名为SERVICE-HI ,端口为8762

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70_pic_center 1]

访问服务：`http://localhost:8762/hello`

![在这里插入图片描述][20201012225746611.png_pic_center]

--------------------

git项目源码：[https://github.com/yilei111/-Spring-Cloud-Finchley][https_github.com_yilei111_-Spring-Cloud-Finchley]

[20201012223819412.png_pic_center]: /images/20221123/110039e5d76148a3a83ec03fd1444650.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70_pic_center]: /images/20221123/830a497da1f5425caf80b511c5f9e0f6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70_pic_center 1]: /images/20221123/d60a8de5b0af4d73ae7d89d62c8bf014.png
[20201012225746611.png_pic_center]: /images/20221123/c461d85aba8640f98eae4b0f5dd5197d.png
[https_github.com_yilei111_-Spring-Cloud-Finchley]: https://github.com/yilei111/-Spring-Cloud-Finchley