spring cloud入门(Eureka client和Eureka server)

spring cloud分为好几个模块,现在我先学习neflix模块,这个模块是spring cloud的核心模块,首先使用maven将eureka client和eureka server的相关架包下载下来:

eureka server:

<?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>springcloud</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <packaging>jar</packaging>


   <name>springcloud</name>
   <description>springcloudtest</description>

   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>1.5.2.RELEASE</version>
      <relativePath/> <!-- lookup parent from repository -->
   </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.cloud</groupId>
         <artifactId>spring-cloud-starter-eureka-server</artifactId>
      </dependency>

      <!-- spring boot test-->
      <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>Dalston.RC1</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>

eureka client:

<?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>eurekaclient</groupId>
    <artifactId>eurekaclient.com</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-netflix</artifactId>
                <version>1.4.6.BUILD-SNAPSHOT</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies><repositories>
    <repository>
        <id>spring-snapshots</id>
        <name>Spring Snapshots</name>
        <url>https://repo.spring.io/libs-snapshot</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
</repositories>

</project>

 

将这两个maven同时下载下来之后我们开始对eureka server进行部署 :

      首先,我们先在resouce下面生成一个application.yml文件,因为是spring boot,所以一切都是自动配置的,我们配置文件如下:

server:
  port: 8790

eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

这里面,其实eureka server也是一个eureka client,这里面defaultZone表示他发送的注册的地址,我这里defaultZone的地址写的是它自己的地址,如果这个地址写的是其他 eureka server地址那么就会形成一个双注册机的情况,同时如果registerWithEureka和fetchRegistry为false的时候表示不去注册,注意这样就形成不了双注册机情况。这里的server.port表示这个程序申请的端口,然后我们创建一个启动类,

package com.example.demo;


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

@EnableEurekaServer
@SpringBootApplication
public class SpringcloudApplication {

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

@EnableEurekaServer和@SpringBootApplication两个注释不能或缺,一个是eureka server启动注解一个是spring boot启动注解,等启动完成我们可以访问localhost:8790。得到如下图:

《spring cloud入门(Eureka client和Eureka server)》

这就表示我们的eureka server配置成功了。

接下来是eureka client的配置文件:

server:
  port: 8060
  servletPath: /
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8790/eureka/
    enabled: true
  instance:
    healthCheckUrlPath: ${server.servletPath}/health
    statusPageUrlPath: ${server.servletPath}/info
    homePageUrl: ${server.servletPath}/
    healthcheck:
      enabled: true
spring:
  application:
    name: eureka-hello

这里eureka.enabled必须是true,否则就不会去想eureka server注册中心发送注册信息了,eureka.client.service-url.defaultZone写eureka server的注册地址。

同样创建一个启动类:

package com.eurekaclient.app;

import com.netflix.appinfo.InstanceInfo;
import com.netflix.discovery.EurekaClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
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;

/**
 * Created by 用户 on 2018/7/6.
 */
@RestController
@SpringBootApplication
@EnableEurekaClient
public class EurekaClientApplication {
    @Value("service.port")
    private String port;
    @Autowired
    private EurekaClient discoveryClient;
    public static void main(String[] args){
        new SpringApplicationBuilder(EurekaClientApplication.class).web(true).run(args);
    }
    @RequestMapping("/hi")
    public String hello(@RequestParam String name){
        return "hello world,"+name+","+"I am from port:"+port;
    }

    @RequestMapping("/info")
    public String info(){
        return "hello, I am eureka client, i am from prot:"+port;
    }

    @RequestMapping("/health")
    public String health(){
        return "i am health,I am from port:"+port;
    }
    @RequestMapping("/instance")
    public String instance(){
        InstanceInfo instanceInfo = discoveryClient.getNextServerFromEureka("EUREKA-HELLO",false);
        return instanceInfo.getHomePageUrl();
    }
}

 @RestController表示这是一个resful的controller的注解 @SpringBootApplication表示启动springboot @EnableEurekaClient表示开启eurekaclient类。完成启动后我们可以在eureka server的页面上看到:

《spring cloud入门(Eureka client和Eureka server)》

这里的EUREKA-HELLO就是上面配置文件中对应的spring.application.name,好了到这里我们就完成了eurekaclient和eurekaserver的配置了。 

    原文作者:Spring Cloud
    原文地址: https://blog.csdn.net/godstyles/article/details/81220695
    本文转自网络文章,转载此文章仅为分享知识,如有侵权,请联系博主进行删除。
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