Spring Cloud Eureka 服务治理(一)

Spring Cloud Eureka 是 Spring Cloud Netflix 微服务套件中的一部分， 它基于NetflixEureka 做了二次封装， 主要负责完成微服务架构中的服务治理功能。Spring Cloud 通过为Eureka增加了 Spring Boot 风格的自动化配置，我们只需通过简单引入依赖和注解配置就能让Spring Boot 构建的微服务应用轻松地与Eureka 服务治理体系进行整合。

使用的boot版本是 1.4.2.RELEASE cloud版本是 Camden.SR3

直接上代码 ：

首先需要注册中心 结合 actuator 监控

application.yml 这里使用yml配置

server:    #tomcat:     #   uri-encoding: UTF-8      #  max-threads: 1000       # min-spare-threads: 30    port: 8888spring:    application:        name: eureka-server        management:    contextPath: /helloendpoints:    info:        path: /appinfo    health:        path: /checkHealtheureka:    instance:        statusPageUrlPath: ${management.contextPath}/${endpoints.info.path}        healthCheckUrlPath: ${management.contextPath}/${endpoints.health.path}    client:        #不向注册中心注册自己        registerWithEureka: false        #检索服务 这里是注册中心        fetchRegistry: false        serviceUrl:            defaultZone: http://localhost:8888/eureka/

注册中心只需要加入注解 @EnableEurekaServer

/** * 注册中心 * @author Administrator * */@EnableEurekaServer@SpringBootApplicationpublic class ServerApplication {public static void main(String[] args) {//SpringApplication.run(DemoApplication.class, args);new SpringApplicationBuilder(ServerApplication.class).web(true).run(args);}}

pom文件 

 <parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.4.2.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent>  <!--依赖管理，用于管理spring-cloud的依赖，其中Camden.SR3是版本号 --><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Camden.SR3</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!-- 监控 -->    <dependency><groupId> org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency> <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-eureka-server</artifactId>        </dependency><!-- 服务中心 --></dependencies>

服务提供者

新建一个项目做为服务提供者，需要注册到注册者中去 注意端口

配置 application.properties 

spring.application.name=springcloud-registereureka.client.serviceUrl.defaultZone=http://localhost:8888/eureka/

启动类 提供者 @EnableDiscoveryClient

@EnableDiscoveryClient@SpringBootApplicationpublic class DemoRegisterApplication {public static void main(String[] args) {SpringApplication.run(DemoRegisterApplication.class, args);}}

@RestControllerpublic class HelloController {private final Logger logger = Logger.getLogger(getClass());@Autowiredprivate  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";}

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><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></dependency></dependencies>

消费者

application.properties 需要注意的事 端口不要冲突

spring.application.name=springcloud-consumerserver.port=9000eureka.client.serviceUrl.defaultZone=http://localhost:8888/eureka/

/** * 消费者 * @author Administrator * */@EnableDiscoveryClient@SpringBootApplicationpublic class DemoConsumerApplication {@Bean@LoadBalancedRestTemplate restTemplate() {return new RestTemplate();}public static void main(String[] args) {SpringApplication.run(DemoConsumerApplication.class, args);}}

重点来了

@RestControllerpublic class ConsumerController {@AutowiredRestTemplate restTemplate;/** * 调用服务 * @return */@RequestMapping(value = "/ribbon-consumer", method = RequestMethod.GET)public String helloConsumer() {//与配置一致return restTemplate.getForEntity("http://springcloud-register/hello", String.class).getBody();}}

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

先启动注册中心，查看服务 访问地址http://localhost:8888/ 会发现还没有服务注册进来

然后分别启动提供者和消费者后会发现多了两个服务

服务注册进来后，消费者就可以访问提供者的服务了

服务就完成 代码地址： 代码地址

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