springcould学习（二）之eureka

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一、eureka介绍

Eureka是Netflix开发的服务发现组件，本身是一个基于REST的服务。Spring Cloud将它集成在其子项目spring-cloud-netflix中，以实现Spring Cloud的服务发现功能。目前Eureka 项目相当活跃，代码更新相当频繁，目前最新的版本是1.5.5。Eureka 2.0也在紧锣密鼓地开发中，2.0将会带来更强的功能和更好的扩展性，但是由于还没有Release，故而不作讨论

二、本节主要来使用eureka来做服务注册和发现

1、新建一个项目hjduan.spring.cloud.eureka继承自父工程，pom文件如下

<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>    <parent>        <groupId>com.hjduan.spring.cloud</groupId>        <artifactId>hjduan.spring.cloud</artifactId>        <version>0.0.1-SNAPSHOT</version>    </parent>    <artifactId>hjduan.spring.cloud.eureka</artifactId>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-security</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-eureka-server</artifactId>        </dependency>    </dependencies>    <build>        <resources>            <resource>                <directory>src/main/resources</directory>                <includes>                    <include>**/*.properties</include>                    <include>**/*.xml</include>                    <include>**/*.yml</include>                </includes>                <filtering>true</filtering>            </resource>        </resources>        <plugins>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>            </plugin>        </plugins>    </build></project>

2、application.yml配置

server:  port: 8761eureka:  instance:    hostname: localhost  client:    register-with-eureka: false    fetch-registry: false    service-url:      defaultZone: http://admin:admin@${eureka.instance.hostname}:${server.port}/eureka/security:  basic:    enabled: true  user:    name: admin #登陆用户名    password: admin#登陆密码

3、启动类

package com.hjduan.spring.cloud.eureka;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;/** * 启动一个服务注册中心 */@EnableEurekaServer@SpringBootApplicationpublic class EurekaApplicationConfiguration {    public  static void main (String[]args){        new SpringApplication(EurekaApplicationConfiguration.class).run(args);    }}

二、修改上一节的两个项目

1、修改hjduan.spring.cloud.provider pom文件如下

<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>    <parent>        <groupId>com.hjduan.spring.cloud</groupId>        <artifactId>hjduan.spring.cloud</artifactId>        <version>0.0.1-SNAPSHOT</version>    </parent>    <artifactId>hjduan.spring.cloud.provider</artifactId>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-eureka</artifactId>        </dependency>        <!-- 健康监控 -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>    </dependencies>    <build>        <resources>            <resource>                <directory>src/main/resources</directory>                <includes>                    <include>**/*.properties</include>                    <include>**/*.xml</include>                    <include>**/*.yml</include>                </includes>                <filtering>true</filtering>            </resource>        </resources>        <plugins>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>            </plugin>        </plugins>    </build></project>

2、application.yml配置

server:  port: 8762eureka:  client:    serviceUrl:       defaultZone: http://admin:admin@localhost:8761/eureka/  instance:    prefer-ip-address: true    instance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}spring:  application:    name: hjduan-spring-cloud-provider

3、控制器

package com.hjduan.spring.cloud.provider;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.cloud.client.ServiceInstance;import org.springframework.cloud.client.discovery.DiscoveryClient;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;import com.netflix.appinfo.InstanceInfo;import com.netflix.discovery.EurekaClient;@RestControllerpublic class UserController {    @Autowired    private EurekaClient eurekaClient;    @Autowired    private DiscoveryClient discoveryClient;    @GetMapping(value = "eureka-instance")    public String serviceUrl() {        InstanceInfo instance = eurekaClient.getNextServerFromEureka("HJDUAN-SPRING-CLOUD-CONSUMER", false);        return instance.getHomePageUrl();    }    @SuppressWarnings("deprecation")    @GetMapping(value = "instance-info")    public ServiceInstance showInfo() {        ServiceInstance localServiceInstance = this.discoveryClient.getLocalServiceInstance();        return localServiceInstance;    }    /*@Autowired    RestTemplate restTemplate;    @GetMapping(value = "/hi/{name}")    public String ribbonHelloWordService(@PathVariable String name) {        return restTemplate.getForObject("http://HJDUAN-SPRING-CLOUD-CONSUMER/hi/{name}", String.class, name);    }*/}

4、启动类

package com.hjduan.spring.cloud.provider;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.loadbalancer.LoadBalanced;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.context.annotation.Bean;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.client.RestTemplate;/** * 注册提供者 *  * 作者： 段浩杰 2017年7月25日 */@EnableEurekaClient@SpringBootApplication@Controllerpublic class ApplicationConfiguration {    public static void main(String[] args) {        new SpringApplication(ApplicationConfiguration.class).run(args);    }    @Bean    public RestTemplate restTemplate() {        return new RestTemplate();    }}

5、修改hjduan.spring.cloud.consumer pom如下

<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>  <parent>    <groupId>com.hjduan.spring.cloud</groupId>    <artifactId>hjduan.spring.cloud</artifactId>    <version>0.0.1-SNAPSHOT</version>  </parent>  <artifactId>hjduan.spring.cloud.consumer</artifactId>  <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-eureka</artifactId>        </dependency>        <!-- 健康监控 -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>    </dependencies>    <build>        <resources>            <resource>                <directory>src/main/resources</directory>                <includes>                    <include>**/*.properties</include>                    <include>**/*.xml</include>                    <include>**/*.yml</include>                </includes>                <filtering>true</filtering>            </resource>        </resources>        <plugins>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>            </plugin>        </plugins>    </build></project>

6、application.yml配置

server:  port: 8763eureka:  client:    serviceUrl:      defaultZone: http://admin:admin@localhost:8761/eureka/  instance:    prefer-ip-address: true    instance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}spring:  application:    name: hjduan-spring-cloud-consumer

7、控制器

package com.hjduan.spring.cloud.consumer;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;/** * 暴露的接口  * 作者： 段浩杰 2017年7月25日 */@RestControllerpublic class UserController {    @Value("${server.port}")    private String port;    @GetMapping(value = "/hi/{name}")    public String showInfo(@PathVariable String name) {        return "hi" + name+port;    }}

8、启动类

package com.hjduan.spring.cloud.consumer;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;/** * 注册提供者  * 作者： 段浩杰 2017年7月25日 */@EnableEurekaClient@SpringBootApplicationpublic class ApplicationConfiguration {    public static void main(String[] args) {        new SpringApplication(ApplicationConfiguration.class).run(args);    }}

9、然后分别启动hjduan.spring.cloud.eureka、hjduan.spring.cloud.provider、hjduan.spring.cloud.consumer这三个项目

10、访问http://localhost:8761,输入用户名密码，进入到eureka中心，来监控和管理服务。

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