Spring Cloud入门教程-服务注册与发现

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1.简介

和Consul、Zookeeper类似，Eureka是一个用于服务注册hefa和发现组件，分为Eureka Server 服务注册中心和Eureka Client 客户端。

服务消费基本过程：服务提供者Eureka Client 向服务注册中心 Eureka Server 注册，将自己的信息提交给Eureka Server,服务消费者Eureka Client 也向服务注册中心 Eureka Server 注册，同事fuwu服务消费者获得一份服务注册列表信息，及服务提供者的IP，可以通过Http 远程调度来消费服务提供者的服务。

2.创建项目

2.1 Eureka Server 

这里涉及到多个项目，所以采用Maven多module 的结构。

2.1.1 创建父项目SpringCloud-Demo

pom.xml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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.springcloud.demo</groupId>
    <artifactId>springcloud-demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.SR1</spring-cloud.version>
    </properties>



    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    

</project>

2.1.2 创建eureka-server Moudule 作为注册中心，使用Spring Initializr构建。

pom.xml 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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.springcloud.demo</groupId>
        <artifactId>springcloud-demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>eureka-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>eureka-server</name>
    <description>Demo project for Spring Boot</description>


    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</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>

添加配置

server.port=8791
spring.application.name=eureka-server

eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
##防止自己注册自己
eureka.client.fetch-registry=false

eureka.client.service-url.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/

在启动类EurekaServerApplication 添加@EnableEurekaServer

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

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

2.2 编写Eureka Client 

新建Module  eureka-client ,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">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>com.springcloud.demo</groupId>
		<artifactId>springcloud-demo</artifactId>
		<version>1.0-SNAPSHOT</version>
	</parent>
	<artifactId>eureka-client</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>eureka-client</name>
	<description>Demo project for Spring Boot</description>


	<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>

增加配置

server.port=8792
spring.application.name=eureka-client
#与eureka server 中的相同（注册地址）
eureka.client.service-url.defaultZone=http://localhost:8791/eureka/

在EurekaClientApplication 上添加注解  @EnableEurekaClient 开启Eureka Client 功能。

2.3 创建controller 

@RestController
public class IndexController {
    @Value("${server.port}")
    private int port;

    @GetMapping("main")
    public int main() {
        return port;
    }
}

main 方法获取client 端口。

3.启动

先启动eureka server 后启动 eureka client . 在浏览器请求http://localhost:8791/

如图：eureka-client 就注册成功了。