簡單入門spring-cloud-eureka

 

版本聲明

組件	版本
spring-boot	2.1.3.RELEASE
spring-cloud-starter-eureka	1.3.4.RELEASE
spring-cloud-dependencies	Finchley.RELEASE

Server端配置：

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka-server</artifactId>
			<version>1.3.4.RELEASE</version>
		</dependency>
	</dependencies>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Finchley.RELEASE</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

server.port=12358
eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
eureka.client.service-url.default-zone=http://${eureka.instance.hostname}:${server.port}/eureka/

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

運行之後：

訪問http://localhost:12358

下面講解客戶端配置：

POM主要的配置如下：

	<dependencies>
		<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>
			<version>1.3.4.RELEASE</version>
		</dependency>
	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Finchley.RELEASE</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

application.properties配置如下：

spring.application.name=hello-service
eureka.client.service-url.defaultZone=http://localhost:12358/eureka/

package com.sh.sctest;

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

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

package com.sh.sctest.controller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController("v1HelloController")
public class HelloController {

    private final Logger logger = LoggerFactory.getLogger(HelloController.class);

    @Autowired
    private DiscoveryClient discoveryClient;


    @PostMapping("/aaa")
    public String index() {
        for (String s : discoveryClient.getServices()) {
            for (ServiceInstance instance : discoveryClient.getInstances(s)) {
                logger.info("/hello, service:" + s + ",host:" + instance.getHost() + ", service_id:" + instance.getServiceId());
            }
        }
        return "hello world !\n";
    }
}

運行客戶端：

訪問 http://localhost:12356/aaa/

RdeMacBook-Pro:~ r$ curl http://localhost:12356/aaa/ -d ''
hello world !
RdeMacBook-Pro:~ r$ 

日誌打印如下：

2019-03-31 21:50:01.916  INFO 17529 --- [io-12356-exec-1] c.sh.sctest.controller.HelloController   : /hello, service:hello-service,host:192.168.2.156, service_id:HELLO-SERVICE

再次訪問server的url：

服務端日誌：