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spring cloud 2.x版本 Eureka Client服务提供者教程

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
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1.3 EurekaClientApplication添加注解@EnableEurekaClient

package spring.cloud.demoo.eurekaclient;

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

@EnableEurekaClient
@SpringBootApplication
public class EurekaClientApplication {

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

}
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@EnableEurekaClient 向eureka服务中心注册服务(推荐使用),如果是其他服务注册中心,例如:consul、zookeeper,建议使用@EnableDiscoveryClient

1.4 添加application.yml配置内容、

spring:
  application:
    name: eureka-client
server:
  port: 8801

eureka:
  instance:
    hostname: localhost
    # 表示eureka client间隔多久去拉取服务注册信息,默认为30秒,如果要迅速获取服务注册状态,可以缩小该值
    lease-renewal-interval-in-seconds: 5
    # 表示eureka server至上一次收到client的心跳之后,等待下一次心跳的超时时间,在这个时间内若没收到下一次心跳,则将移除该instance。
    # 默认为90秒
    # 如果该值太大,则很可能将流量转发过去的时候,该instance已经不存活了。
    # 如果该值设置太小了,则instance则很可能因为临时的网络抖动而被摘除掉。
    # 该值至少应该大于 leaseRenewalIntervalInSeconds
    lease-expiration-duration-in-seconds: 10
  client:
    service-url:
      defaultZone: http://localhost:8701/eureka/
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配置中http://localhost:8701/eureka/ 调用eureka-server,可以参考: eureka-server注册中心搭建

1.5 创建测试controller:EurekaClientController

package spring.cloud.demoo.eurekaclient.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;

/**
 * @auther: maomao
 * @DateT: 2019-09-17
 */
@RestController
public class EurekaClientController {

    @Value("${server.port}")
    private String port;

    @RequestMapping("/info")
    public String syaHello(HttpServletRequest request) {
        String message = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getServletPath();
        return message;
    }

}
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1.6 启动eureka-client服务

访问http://localhost:8801/info,并返回结果,如下图所示。

spring cloud 2.x版本 Eureka Client服务提供者教程

这时在访问服务注册中心,如果下入所示:

spring cloud 2.x版本 Eureka Client服务提供者教程

可以看到eureka-client已经注册到服务注册中心。

至此,一个简单的单机eureka client服务提供者就搭建完成。服务的提供者提供一个Restful服务。

彩蛋

eureka client集群的搭建

1.1 配置本地host文件

127.0.0.1		eureka1.client.com
127.0.0.1		eureka2.client.com
127.0.0.1		eureka3.client.com
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1.2 增加application.yml配置文件

增加application-clinet1.yml和application-clinet2.yml文件,修改原application.yml文件。

  • application.yml
spring:
  application:
    name: eureka-client
server:
  port: 8801

eureka:
  instance:
    hostname: eureka1.client.com
    lease-renewal-interval-in-seconds: 5
    lease-expiration-duration-in-seconds: 10
  client:
    service-url:
      defaultZone: http://eureka1.server.com:8701/eureka/,http://eureka2.server.com:8702/eureka/,http://eureka3.server.com:8703/eureka/
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  • application-client1.yml
spring:
  application:
    name: eureka-client
server:
  port: 8802

eureka:
  instance:
    hostname: eureka2.client.com
    lease-renewal-interval-in-seconds: 5
    lease-expiration-duration-in-seconds: 10
  client:
    service-url:
      defaultZone: http://eureka1.server.com:8701/eureka/,http://eureka2.server.com:8702/eureka/,http://eureka3.server.com:8703/eureka/
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  • application-client2.yml
spring:
  application:
    name: eureka-client
server:
  port: 8803

eureka:
  instance:
    hostname: eureka3.client.com
    lease-renewal-interval-in-seconds: 5
    lease-expiration-duration-in-seconds: 10
  client:
    service-url:
      defaultZone: http://eureka1.server.com:8701/eureka/,http://eureka2.server.com:8702/eureka/,http://eureka3.server.com:8703/eureka/
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此时打开服务注册中心,显示

原文  https://juejin.im/post/5d82061be51d4561f95eeaf5
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