eureka-client入门案例

eureka-client入门案例

首先启动eureka-server服务，参考文档：https://www.cnblogs.com/Y-wee/p/14129138.html

创建eureka-client子项目，导入依赖

<dependencies>
        <!--eureka-client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</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-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!--mysql-connector-java-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--jdbc-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

修改配置文件

server:
  port: 8001

spring:
  application:
    name: payment-8001
    
eureka:
  client:
    # 是否在注册中心进行注册
    register-with-eureka: true
    # 是否从EurekaServer抓取已有的注册信息,默认为true,
    # 单节点无所谓,集群必须设置为true才能配合ribbon使用负载均衡
    fetchRegistry: true
    service-url:
      defaultZone: http://localhost:7001/eureka
  # 该配置需要引入spring-boot-starter-actuator包
  instance:
    # 设置eureka显示的主机名称
    instance-id: payment-8001
    # 鼠标放在主机名称上显示ip地址
    prefer-ip-address: true

启动类添加@EnableEurekaClient注解，开启eureka客户端服务功能

package com.yl.payment;

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

@SpringBootApplication
@EnableEurekaClient
public class Payment8001Application {

    public static void main(String[] args) {
        SpringApplication.run(Payment8001Application.class,args);
    }

}

启动项目，可在eureka注册中心看到payment-8001服务被注册

服务发现

获取服务相关信息并返回

启动类添加@EnableDiscoveryClient注解

package com.yl.payment;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class Payment8002Application {

    public static void main(String[] args) {
        SpringApplication.run(Payment8002Application.class,args);
    }

}

controller提供接口获取服务信息

package com.yl.payment.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

/**
 * 支付
 *
 * @auther Y-wee
 */
@RestController
@Slf4j
@RequestMapping("/payment")
public class PaymentController {
    @Resource
    private DiscoveryClient discoveryClient;

    /**
     * 服务发现,获取服务相关信息
     *
     * @return 服务相关信息
     */
    @GetMapping(value = "/discovery")
    public Object discovery() {
        List<String> services = discoveryClient.getServices();
        for (String service : services) {
            log.info("service: " + service);
        }

        List<ServiceInstance> instances = discoveryClient.getInstances("PAYMENT");
        for (ServiceInstance instance : instances) {
            log.info(instance.getServiceId() + "\t" + instance.getHost() + "\t" + instance.getPort() + "\t" + instance.getUri());
        }
        return this.discoveryClient;
    }

}