EurekaServer服务注册中心

绝地灬酷狼 2023-07-15 09:23 15阅读 0赞

# EurekaServer服务注册中心 #

大型系统一般拆分为多个子系统，在微服务中，这些子系统就是微服务，每一个服务需要部署多个实例，这些实例就需要使用Eureka进行服务管理。服务ID/名称是唯一标识，根据唯一标识在注册中心找到实例信息，再调用服务。

EurekaServer服务注册中心

pom.xml

<?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">
        <parent>
            <artifactId>duck</artifactId>
            <groupId>cn.duck</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>duck-eureka-server</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-actuator</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-eureka-server</artifactId>
                <version>1.3.1.RELEASE</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-netflix-eureka-server</artifactId>
                <version>1.3.1.RELEASE</version>
            </dependency>
        </dependencies>
    
        
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <version>2.0.1.RELEASE</version>
                </plugin>
            </plugins>
        </build>
    </project>

application.yml

spring:
      application:
        name: duck-eureka-server
    
    server:
      port: 8761
    
    eureka:
      instance:
        # 当前实例的主机名称
        hostname: eureka
      client:
        # 是否注册到eurekaserver
        registerWithEureka: false
        # 是否拉取信息
        fetchRegistry: false

SpringBoot启动文件

@SpringBootApplication //SpinrgBoot核心注解，用于开启自动配置
    @EnableEurekaServer
    public class EurekaServerApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(EurekaServerApplication.class, args);
        }
    }

Eureka客户端

pom.xml

<?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">
        <parent>
            <artifactId>duck</artifactId>
            <groupId>cn.duck</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>duck-eureka-client</artifactId>
    
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Dalston.SR1</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
        <dependencies>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</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-data-jpa</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-rest</artifactId>
            </dependency>
            <dependency>
                <groupId>org.hsqldb</groupId>
                <artifactId>hsqldb</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
    
        
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <version>2.0.1.RELEASE</version>
                </plugin>
            </plugins>
        </build>
    </project>

application.yml

application:
        name: duck-eureka-client
    
    server:
      port: 9002
    
    eureka:
      client:
        # 是否注册到eurekaserver
        registerWithEureka: true
        # 是否拉取信息
        fetchRegistry: true
        serviceUrl:
          defaultZone: http://127.0.0.1:8761/eureka/

启动文件  
@SpringBootApplication //SpinrgBoot核心注解，用于开启自动配置  
@EnableEurekaClient  
public class EurekaClientApplication \{

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

\}  
···

SmsController服务提供者

// spring  data rest 技术
    @RepositoryRestResource(collectionResourceRel = "sms", path = "sms")
    public interface SmsController extends PagingAndSortingRepository<SmsDomain, Long> {
    }

SmsDomain

package cn.duck.eureka.client;
    
    import javax.persistence.*;
    import java.io.Serializable;
    
    @Entity
    @Table(name = "sms")
    public class SmsDomain implements Serializable {
        private static final long serialVersionUID = -2485043500570220853L;
    
        @Id
        @GeneratedValue
        private Long smsId;
    
        @Column
        private String phone;
        @Column
        private String content;
    
        public Long getSmsId() {
            return smsId;
        }
    
        public void setSmsId(Long smsId) {
            this.smsId = smsId;
        }
    
        public String getPhone() {
            return phone;
        }
    
        public void setPhone(String phone) {
            this.phone = phone;
        }
    
        public String getContent() {
            return content;
        }
    
        public void setContent(String content) {
            this.content = content;
        }
    }

服务调用EurekaConsumer

pom.xml

application.yml

spring:
      application:
        name: duck-consumer
    
    server:
      port: 9100
    
    eureka:
      client:
        serviceUrl:
          defaultZone: http://127.0.0.1:8761/eureka/

启动类

@SpringBootApplication
    @EnableEurekaClient
    public class ConsumerApplication {
    
        public static void main(String[] args) {
            new SpringApplicationBuilder(ConsumerApplication.class).web(true).run(args);
        }
    }

调用类

package cn.consumer;
    
    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.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    
    import java.io.IOException;
    import java.util.List;
    
    @RestController
    public class MakeOrder {
        @Autowired
        DiscoveryClient discoveryClient;// spring cloud 提供的客户端工具
    
        @RequestMapping("test")
        public String test() throws IOException {
            // 调用服务器之前，通过eureka client 查询服务的实例信息
            // 也就是说去看 部署了哪些机器，以及IP 端口等信息
            List<ServiceInstance> instances = discoveryClient.getInstances("duck-eureka-client");
    
            for (ServiceInstance serviceInstance : instances) {
                System.out.println("获取到服务实例：" + serviceInstance.getPort());
            }
            // ribbon 客户端负载均衡
            ServiceInstance serviceInstance = instances.get(0);
    
            // 获取的IP  端口  信息
            String host = serviceInstance.getHost();
            int port = serviceInstance.getPort();
    
            System.out.println("host:" + host + "port:" + port);
    
            String result = new RestTemplate().getForObject("http://localhost:" + port +"/sms/1", String.class);
    
            return result;
        }
    }

注册服务中心界面

![20200316151505248.png][]

EurekaClient作为接口提供者 是接口服务方

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1Y2FpZnUxOTg5_size_16_color_FFFFFF_t_70][]

EurekaConsumer作为接口消费者 是接口的客户端

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1Y2FpZnUxOTg5_size_16_color_FFFFFF_t_70 1][]

[20200316151505248.png]: /images/20230528/e3dc591fe2bb49e3a1548f7d62a59828.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1Y2FpZnUxOTg5_size_16_color_FFFFFF_t_70]: /images/20230528/d84ab3952b9440ee94a8ac7829a95be6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1Y2FpZnUxOTg5_size_16_color_FFFFFF_t_70 1]: /images/20230528/99df6b32768947c58422d8a93dfbc49e.png