1、介绍

2、快速开始

父工程的maven 配置文件,如下

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mindasoft</groupId>

    <artifactId>spring-cloud-eureka-parent</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>pom</packaging>

    <name>feign-eureka</name>

    <description>Demo project for Spring Cloud</description>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.6.4</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <modules>

        <module>server</module>

        <module>client</module>

    </modules>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-dependencies</artifactId>

                <version>2021.0.1</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <build>

        <plugins>

            <plugin>

                <!--skip deploy (this is just a test module) -->

                <artifactId>maven-deploy-plugin</artifactId>

                <configuration>

                    <skip>true</skip>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

2.1、服务注册

pom文件

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mindasoft</groupId>

    <artifactId>spring-cloud-eureka-provider</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>spring-cloud-eureka-provider</name>

    <description>Demo project for Spring Cloud</description>

    <parent>

        <groupId>com.mindasoft</groupId>

        <artifactId>spring-cloud-eureka-parent</artifactId>

        <version>0.0.1-SNAPSHOT</version>

        <relativePath>..</relativePath> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <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>

        <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>

            </plugin>

        </plugins>

    </build>

</project>

application.yml

spring:

  application:

    name: provider-service

server:

  port: 9001

eureka:

  client:

    serviceUrl:

      defaultZone: http://localhost:9000/eureka/

  instance:

    leaseRenewalIntervalInSeconds: 10

    metadataMap:

      instanceId: ${spring.application.name}:${spring.application.instance_id:${server.port}}

启动类

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient     // Eureka Client 标识

@SpringBootApplication

public class EurekaHelloProviderApplication {

    public static void main(String[] args) {

        SpringApplication.run(EurekaHelloProviderApplication.class, args);

    }

}

服务提供

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.cloud.client.serviceregistry.Registration;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

/**

 * Created by huangmin

 */

@RestController

public class HelloProvider {

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

    @Value("${server.port}")

    private int port;

    @Autowired

    private Registration registration;       // 服务注册 --> EurekaRegistration

    @RequestMapping("/hello")

    public String provider() {

        return "Hello,I'm Provider!My port is :" + port + ",serviceId:" + registration.getServiceId() + " :" + registration.getInstanceId();

    }

}

2.2、服务发现

maven配置文件，与服务注册仅名称不一样，其他都是相同的。

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mindasoft</groupId>

    <artifactId>spring-cloud-eureka-consumer</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>spring-cloud-eureka-consumer</name>

    <description>Demo project for Spring Cloud</description>

    <parent>

        <groupId>com.mindasoft</groupId>

        <artifactId>spring-cloud-eureka-parent</artifactId>

        <version>0.0.1-SNAPSHOT</version>

        <relativePath>..</relativePath> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <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>

        <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>

            </plugin>

        </plugins>

    </build>

</project>

application.properties

server.port=9002

# 服务注册中心地址

eureka.client.service-url.defaultZone=http://localhost:9000/eureka/

# 服务名称

spring.application.name=consumer-service

启动类

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableDiscoveryClient

@SpringBootApplication

public class EurekaConsumerApplication {

      @Bean

      RestTemplate restTemplate() {

        return new RestTemplate();

    }

    public static void main(String[] args) {

        SpringApplication.run(EurekaConsumerApplication.class, args);

    }

}

消费者

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.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**

 * Created by huangmin on 2017/11/10 14:30.

 */

@RestController

public class HelloConsumer {

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

	@Autowired

	private DiscoveryClient discoveryClient; // 服务发现客户端

	@Autowired

	private RestTemplate restTemplate; // HTTP 访问操作类

	@RequestMapping("/hello")

	public String provider() {

		ServiceInstance instance = serviceInstance();

		logger.info("provider service, host = " + instance.getHost()

				+ ", service_id = " + instance.getServiceId());

		String providerMsg = restTemplate.getForEntity(instance.getUri() + "/hello",

				String.class).getBody();

		return "Hello,I,m Consumer!discovery a provider:"+ instance.getHost() + ":" + instance.getPort()

				+ "<br/> msg from provider : <br/><br/> " + providerMsg;

	}

	/**

	 * 获取当前服务的服务实例

	 *

	 * @return ServiceInstance

	 */

	public ServiceInstance serviceInstance() {

		List<ServiceInstance> list = discoveryClient.getInstances("provider-service");

		if (list != null && list.size() > 0) {

			return list.get(0);

		}

		return null;

	}

}

启动后台，访问http://127.0.0.1:9002/hello，页面显示如下：

Hello,I,m Consumer!discovery a provider:localhost:9001

msg from provider :

Hello,I'm Provider!My port is :9001,serviceId:provider-service :localhost:provider-service:9001

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