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Spring Cloud Eureka消费者获取服务者信息 在Spring Cloud Eureka配置集群中，我们介绍了Eureka集群部署的方式，这篇文章，我们继续编写服务的提供者及服务的消费者。服务提供者我们创建microservice-simple-provider-user工程，作为服务的提供者。添加依赖 <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>添加配置文件spring: application: name: microservice-provider-user eureka: client: service-url: default-zone: http://peer1:8761/eureka,http://peer2:8762/eureka instance: prefer-ip-address: true metadata-map: my-metadata: 自定义元数据创建用户实体User.java@Data public class User { private Long id; private String userName; private String name; private Integer age; private BigDecimal balance; }创建服务提供者@RestController public class UserController { @GetMapping("{id}") public User findById(@PathVariable Long id){ User user = new User(); user.setId(id); user.setName("zhangsan"); user.setName("张三"); user.setAge(31); user.setBalance(new BigDecimal(300)); return user; } }服务消费者我们创建microservice-consumer-movie工程，作为服务的消费者。添加依赖添加依赖 <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>添加配置文件spring: application: name: microservice-provider-user eureka: client: service-url: default-zone: http://peer1:8761/eureka,http://peer2:8762/eureka instance: prefer-ip-address: true metadata-map: my-metadata: 自定义元数据我们通过metadata-map可以自定义元数据。测试获取服务提供者信息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 javax.annotation.Resource; import java.util.List; /** * 博客：https://www.xiangcaowuyu.net * Description: * * @Author: 香草物语 * DateTime: 2021-07-17 22:11 */ @RestController public class MovieController { @Resource private DiscoveryClient discoveryClient; @GetMapping("/user-instance") public List<ServiceInstance> showInfo(){ return discoveryClient.getInstances("microservice-provider-user"); } }我们访问http://localhost:8081/user-instance，可以获取到服务提供者的详细信息[{ "scheme": "http", "host": "192.168.3.48", "port": 8080, "metadata": { "management.port": "8080", "my-metadata": "自定义元数据" }, "secure": false, "uri": "http://192.168.3.48:8080", "serviceId": "MICROSERVICE-PROVIDER-USER", "instanceId": "DESKTOP-PPDVS3E:microservice-provider-user", "instanceInfo": { "instanceId": "DESKTOP-PPDVS3E:microservice-provider-user", "app": "MICROSERVICE-PROVIDER-USER", "appGroupName": null, "ipAddr": "192.168.3.48", "sid": "na", "homePageUrl": "http://192.168.3.48:8080/", "statusPageUrl": "http://192.168.3.48:8080/actuator/info", "healthCheckUrl": "http://192.168.3.48:8080/actuator/health", "secureHealthCheckUrl": null, "vipAddress": "microservice-provider-user", "secureVipAddress": "microservice-provider-user", "countryId": 1, "dataCenterInfo": { "@class": "com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo", "name": "MyOwn" }, "hostName": "192.168.3.48", "status": "UP", "overriddenStatus": "UNKNOWN", "leaseInfo": { "renewalIntervalInSecs": 30, "durationInSecs": 90, "registrationTimestamp": 1626531693579, "lastRenewalTimestamp": 1626531693579, "evictionTimestamp": 0, "serviceUpTimestamp": 1626531693579 }, "isCoordinatingDiscoveryServer": false, "metadata": { "management.port": "8080", "my-metadata": "自定义元数据" }, "lastUpdatedTimestamp": 1626531693579, "lastDirtyTimestamp": 1626531693019, "actionType": "ADDED", "asgName": null } }] -
Spring Cloud Eureka配置集群 Eureka Server可以通过运行多个实例并通过相互注册的方式实现高可用性的部署。Eureka Server实例会彼此通过增量同步的方式同步信息，确保节点数据之间的一致性。配置hosts由于我这里部署到同一个电脑上，因此需要配置hosts，以便进行服务之间的区分。win电脑hosts文件位于：C:\Windows\System32\drivers\etc\hostsMac及Linux电脑hosts文件位于：/etc/hosts在hosts文件末尾增加以下内容：C:\Windows\System32\drivers\etc配置服务提供者分别创建两个Spring Boot应用，分别为microservice-discovery-eureka、microservice-discovery-eureka-ha，代表两个服务提供者工程。添加依赖两个工程，同时添加以下依赖。<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency>修改启动类两个工程的启动类，分别添加@EnableEurekaServer注解。@SpringBootApplication @EnableEurekaServer public class MicroserviceDiscoveryEurekaApplication { public static void main(String[] args) { SpringApplication.run(MicroserviceDiscoveryEurekaApplication.class, args); } }microservice-discovery-eureka配置文件如下spring: application: name: microservice-discovery-eureka server: port: 8761 eureka: instance: hostname: peer1 appname: microservice-discovery-eureka prefer-ip-address: false client: serviceUrl: defaultZone: http://peer2:8762/eureka # false表示不向注册中心注册自己 register-with-eureka: true # false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务 fetch-registry: truemicroservice-discovery-eureka-ha配置文件如下spring: application: name: microservice-discovery-eureka server: port: 8762 eureka: instance: hostname: peer2 appname: microservice-discovery-eureka client: serviceUrl: defaultZone: http://peer1:8761/eureka # false表示不向注册中心注册自己 register-with-eureka: true # false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务 fetch-registry: true可以看到，两个工程通过相互注册的方式，实现集群。配置文件，需要注意以下内容[alt type="success"]hostname需要不同[/alt][alt type="info"]appname必须保持一致[/alt][alt type="warning"]defaultZone需要使用我们配置的IP映射，而不是使用IP[/alt]
