springcloud之eureka小栗子

旧城等待， 2022-12-17 07:24 101阅读 0赞

## 写在前面 ##

本例采用maven的模块项目进行说明。源码点[这里][Link 1]。

## 1：项目结构说明 ##

由以下三个项目构成：

myeureka：作为父项目
    my-enreka-server：作为eureka服务端
    myeureka-client：作为eureka客户端

## 2：创建父项目myeureka ##

### 2.1：创建项目 ###

`new`\-`project`，选择左侧的`Maven`:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhbmcwOTA3_size_16_color_FFFFFF_t_70_pic_center]  
然后输入`GAV`,finish后删除`src`因为是作为父项目所以不需要源代码目录，最后只保留`pom.xml`。

### 2.2：设置springboot的parent的starter的pom依赖 ###

<parent>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-parent</artifactId>
       <version>2.0.3.RELEASE</version>
       <relativePath/>
     </parent>

### 2.3：设置springcloud的pom依赖 ###

这里以`dependecyManagement`方式进行设置：

<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>

### 2.4：引入maven的springboot插件 ###

引入后可以通过maven来运行springboot程序:

<build>
      <plugins>
        <plugin>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
      </plugins>
    </build>

### 2.5：完整pom ###

<?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>dongshi.daddy</groupId>
      <artifactId>my-eureka</artifactId>
      <version>1.0-SNAPSHOT</version>
      <packaging>pom</packaging>
    
      <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/>
      </parent>
    
      <modules>
        <module>my-enreka-server</module>
        <module>myeureka-client</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>

## 3：创建子项目my-enreka-server ##

### 3.1：创建项目 ###

鼠标选中父项目，`new`\->`module`，选择左侧的`Spring Initialzr`：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhbmcwOTA3_size_16_color_FFFFFF_t_70_pic_center 1]  
next后，选择java版本为8，type为maven，然后录入gav，然后一路next，最后finish。

### 3.2：在父项目中配置模块 ###

在myeureka的pom中添加如下内容：

<modules>
      <module>my-enreka-server</module>
    </modules>

### 3.3：依赖父项目 ###

<parent>
      <groupId>dongshi.daddy</groupId>
      <artifactId>my-eureka</artifactId>
      <version>1.0-SNAPSHOT</version>
    </parent>

### 3.4：引入eureka-server依赖 ###

<dependencies>
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
      </dependency>
    </dependencies>

### 3.5：完整pom ###

### 3.6：配置eureka的配置 ###

server:
      port: 8761
    
    eureka:
      instance:
        hostname: localhost
      client:
        registerWithEureka: false
        fetchRegistry: false
        serviceUrl:
          defaultZone: http://${ eureka.instance.hostname}:${ server.port}/eureka/
    
    spring:
      application:
        name: eurka-server

### 3.7：启用eureka ###

添加`@EnableEurekaServer`:

@SpringBootApplication
    @EnableEurekaServer
    public class MyEnrekaServerApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(MyEnrekaServerApplication.class, args);
        }
    
    }

### 3.8：启用服务并测试 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhbmcwOTA3_size_16_color_FFFFFF_t_70_pic_center 2]

## 4：创建子项目myeureka-client ##

### 4.1：创建项目 ###

### 4.2：在父项目中配置模块 ###

在myeureka的pom中添加如下内容：

<modules>
      <module>myeureka-client</module>
    </modules>

### 4.3：依赖父项目 ###

<parent>
      <groupId>dongshi.daddy</groupId>
      <artifactId>my-eureka</artifactId>
      <version>1.0-SNAPSHOT</version>
    </parent>

### 4.4：引入依赖 ###

<dependencies>
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
      </dependency>
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
      </dependency>
    </dependencies>

### 4.5：完整pom ###

### 4.6：配置eureka的配置 ###

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

除了端口号，还配置了eureka服务端的地址，从而可以向服务端注册自己对外提供服务。

### 4.7：测试 ###

*  启动eureka的服务端
 *  启动eureka的客户端
 *  查看客户端注册信息日志

2020-10-23 11:16:25.920  INFO 49924 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_DONGSHIDADDY-FIRST-EUREKA-CLIENT/cj-PC:dongshidaddy-first-eureka-client:8762: registering service...
    2020-10-23 11:16:26.001  INFO 49924 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8762 (http) with context path ''
    2020-10-23 11:16:26.002  INFO 49924 --- [           main] .s.c.n.e.s.EurekaAutoServiceRegistration : Updating port to 8762
    2020-10-23 11:16:26.005  INFO 49924 --- [           main] d.d.m.MyeurekaClientApplication          : Started MyeurekaClientApplication in 7.507 seconds (JVM running for 8.404)
    2020-10-23 11:16:26.129  INFO 49924 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_DONGSHIDADDY-FIRST-EUREKA-CLIENT/cj-PC:dongshidaddy-first-eureka-client:8762 - registration status: 204

*  查看服务端日志

2020-10-23 11:16:26.126  INFO 53072 --- [nio-8761-exec-2] c.n.e.registry.AbstractInstanceRegistry  : Registered instance DONGSHIDADDY-FIRST-EUREKA-CLIENT/cj-PC:dongshidaddy-first-eureka-client:8762 with status UP (replication=false)

*  查看eureka注册信息  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhbmcwOTA3_size_16_color_FFFFFF_t_70_pic_center 3]

## 最后：都让开，我要喝瑞幸 ##

![在这里插入图片描述][20200828090303329.png_pic_center]

[Link 1]: https://download.csdn.net/download/wang0907/13023444
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhbmcwOTA3_size_16_color_FFFFFF_t_70_pic_center 1]: /images/20221123/82b5e4ee8f0248dca9ca7781f008eb7a.png
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[20200828090303329.png_pic_center]: /images/20221123/06b48cf5db914882a935c357e4c9f0a3.png