Spring Cloud Eureka 搭建服务注册中心

一、搭建服务注册中心

1. 访问 http://start.spring.io/ 创建 maven 工程，在 Search for dependencies 中输入 Eureka Server 选中弹出的 Eureka Server 。输入 Artifact 为 Eureka 。

2. 下载完成后，解压下载的压缩包，并把解压后的 maven 工程导入 Eclipse。

3. pom.xml 配置如下：

4. EurekaApplication.java

package com.example.Eureka;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer // 这个注解是用来启用 Eureka 注册中心的
@SpringBootApplication
public class EurekaApplication {

   public static void main(String[] args) {
       SpringApplication.run(EurekaApplication.class, args);
   }
}

5. 在 application.properties 中配置属性

spring.application.name=eureka-server
server.port = 1111
eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
eureka.client.service-url.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/

6. 配置完成后执行 EurekaApplication

7. 通过 http://localhost:1111/ 访问服务注册中心

二、部署服务提供者

1. 访问 http://start.spring.io/ 输入 Artifact 为 server1,Generate Project alt + 下载创建好的工程

2. 解压下载好的工程文件，并报 maven 工程导入 Eclipse

3. 在 pom.xml 中配置依赖的 jar 包

<?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.example</groupId>
   <artifactId>server1</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <packaging>jar</packaging>

   <name>server1</name>
   <description>Demo project for Spring Boot</description>

   <parent>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-parent</artifactId>
       <version>1.5.13.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</artifactId>
            <version>1.4.4.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>1.4.4.RELEASE</version>
       </dependency>

       <dependency>
           <groupId>log4j</groupId>
           <artifactId>log4j</artifactId>
           
       </dependency>

   <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-annotations</artifactId>
       <version>2.9.6</version>
    </dependency>

    <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-core</artifactId>
       <version>2.9.6</version>
    </dependency>

    <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-databind</artifactId>
       <version>2.9.6</version>
    </dependency>


   </dependencies>

   <dependencyManagement>
       <dependencies>
          <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-dependencies</artifactId>
             <version>Brixton.SR5</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>

4. HelloController.java 是响应请求的 controller

package com.example.server1;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
   private final Logger logger = Logger.getLogger(HelloController.class);

   @Autowired
   private DiscoveryClient client;

   @RequestMapping(value="/hello",method = RequestMethod.GET)
   public String index() {
       ServiceInstance instance = client.getLocalServiceInstance();
       logger.info("/hello,host:" + instance.getHost() +", service_id:"
               + instance.getServiceId());
       return "Hello World";
   }


}

5. HellApplication.java 是启用服务提供者的主类

package com.example.server1;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@EnableDiscoveryClient // 这个注解是用来向服务注册开启中心进行注册功能的
@SpringBootApplication
public class HellApplication {
   public static void main(String[] args) {
       SpringApplication.run(HellApplication.class, args);
       System.out.println("Hell word");
   }

}

6. 在application.properties 文件配置 prong-boot 属性

spring.application.name=hello-service
eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/

7. 启动 HellApplication 后，服务提供者在服务注册中心注册成功

Spring Cloud Eureka 搭建服务注册中心

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