springCloud Finchley 微服务架构从入门到精通【二】Eureka服务注册与发现

傷城~ 2023-10-17 20:15 15阅读 0赞

\#\#一、开发工具说明\#\#

**为了防止代码运行错误，建议使用一致的版本：**

*  **开发工具：Eclipse : Version: Neon.3 Release (4.6.3)**  
    开发spring cloud应用推荐使用 idea或者spring官方提供的STS工具，笔者由于公司内部使用习惯等原因，还是选择了Eclipse安装STS插件
 *  **STS插件 下载地址：http://spring.io/tools/sts/all/**  
    这里注意：STS插件要选择与Eclipse对应的版本：

![这里写图片描述][70]

*  **JDK ： jdk1\_8\_131**
 *  **MAVEN ：maven 3.5**

\#\#二、创建Eureka注册中心\#\#  
\#\#\#1、创建一个Maven主项目\#\#\#

![这里写图片描述][70 1]

删除其目录下的src包，只剩下pom.xml

**这里打包选择pom，最终其子项目重复依赖统一提取到这里，这就是主项目的主要作用**  
\#\#\#2、在主项目上创建一个springboot项目\#\#\#

![这里写图片描述][70 2]

选择 **Eureka Server** ，项目创建完成

![这里写图片描述][70 3]

此时pom.xml为：

<?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.mayi.springcloud</groupId>
    	<artifactId>commonservice-eureka</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>commonservice-eureka</name>
    	<description>eureka 注册中心</description>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>2.0.1.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>Finchley.M9</spring-cloud.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.cloud</groupId>
    			<artifactId>spring-cloud-starter-netflix-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>
    
    	<repositories>
    		<repository>
    			<id>spring-milestones</id>
    			<name>Spring Milestones</name>
    			<url>https://repo.spring.io/milestone</url>
    			<snapshots>
    				<enabled>false</enabled>
    			</snapshots>
    		</repository>
    	</repositories>
    
    
    </project>

\#\#\#3、配置bootstrap.yml\#\#\#

将resources目录下的application.properties改名为bootstrap.yml（建议使用格式化ymal语言，好处自己琢磨吧\_），ymal 校验比较严格，我的是换行空两格，保持统一，编辑器也是有提示的

server:
      port: 8761
    spring:
      application:
        name: service-registry
    eureka:
      instance:
        prefer-ip-address: true
      client:
        fetch-registry: false
        register-with-eureka: false
      server:
        wait-time-in-ms-when-sync-empty: 0

解释：

*  **配置为server :**  
    fetch-registry: false  
    register-with-eureka: false

\#\#\#4、启动类配置\#\#\#

添加@EnableEurekaServer注解即可

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

使用SpringBootApp启动，访问地址：localhost:8761

![这里写图片描述][70 4]

正常打开以上网页，说明Eureka注册中心配置成功。

\#\#三、创建客户端项目\#\#

\#\#\#1、pom.xml 同上，bootstrap.yml简单代码如下：\#\#\#

spring:
      application:
        name: service-eureka-client
    server:
      port: 8800

\#\#\#2、启动类添加@EnableEurekaClient注解\#\#\#  
这里建议使用\*\*@EnableEurekaClient**注解来声明客户端，因为我们使用的是Eureka注册中心，如果使用zookeeper或其他注册中心使用**@EnableDiscoveryClient\*\*,而对于Eureka注册中心来说两者都可

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

\#\#\#3、启动项目\#\#\#

如图，客户端注册成功：

![这里写图片描述][70 5]

[70]: https://img-blog.csdn.net/20180427142635382?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYmxvZw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[70 1]: https://img-blog.csdn.net/20180427142648624?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYmxvZw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[70 2]: https://img-blog.csdn.net/20180427142706673?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYmxvZw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[70 3]: https://img-blog.csdn.net/20180427142719599?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYmxvZw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[70 4]: https://img-blog.csdn.net/20180427142746454?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYmxvZw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[70 5]: https://img-blog.csdn.net/20180427142807363?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYmxvZw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70