Spring Cloud Eureka服务注册与发现

1、构建microservice-spring-cloud项目，里面引入上节的服务提供者microservice-simple-provider-user和服务消费者microservice-　　　　simple-consumer-movie项目

2、在microservice-spring-cloud创建服务注册与发现的项目microservice-discovery-eureka,作为Eureka的服务端

3、在microservice-discovery-eureka的pom.xml文件中引入eureka-server依赖

    <dependency>
    　　<groupId>org.springframework.cloud</groupId>
      　<artifactId>spring-cloud-starter-eureka-server</artifactId>
    </dependency>
　　
　　 <!-- 用户验证依赖 -->
     <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-security</artifactId>
     </dependency>

4、在microservice-discovery-eureka的application.properties文件中设置相关参数

server.port=8761

#配置安全验证，用户名及密码
security.basic.enabled=true
security.user.name=user
security.user.password=password

#Eureka只作为Server端，所以不用向自身注册
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

#对Eureka服务的身份验证
eureka.client.serviceUrl.defaultZone=http://user:password@localhost:8761/eureka

5、注册Eureka Server

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

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

6、在microservice-provider-user的pom.xml文件中引入依赖

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        
        <!-- 监控和管理生产环境的依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>        

7、在microservice-provider-user的application.properties文件中进行服务注册配置

#设置应用的名称
spring.application.name=microservice-provider-user
#服务注册的Eureka Server地址
eureka.client.serviceUrl.defaultZone=http://user:password@localhost:8761/eureka
#设置注册ip
eureka.instance.prefer-ip-address=true
#自定义应用实例id
eureka.instance.instanceId=${spring.application.name}:${spring.application.instance_id:${server.port}}
#健康检查
eureka.client.healthcheck.enabled=true

8、在microservice-provider-user中使用Eureka Client

    //Eureka客户端
    @Autowired
    private EurekaClient eurekaClient;
    
    //服务发现客户端
    @Autowired
    private DiscoveryClient discoveryClient;
        
    /**
     * 获得Eureka instance的信息，传入Application NAME
     * 
     * */
    @GetMapping("eureka-instance")
    public String serviceUrl(){
        InstanceInfo instance = this.eurekaClient.getNextServerFromEureka("MICROSERVICE-PROVIDER-USER", false);
        return instance.getHomePageUrl();
    }

    /**
     * 本地服务实例信息
     * */
    @GetMapping("instance-info")
    public ServiceInstance showInfo(){
        ServiceInstance localServiceInstance = this.discoveryClient.getLocalServiceInstance();
        return localServiceInstance;
    }

9、运行结果

 10、整体代码见https://i.cnblogs.com/Files.aspx中的文件microservice-spring-cloud