Spring Cloud Netflix入门（Eureka）

Eureka主要负责服务注册及服务发现，但同时带有负载均衡的作用。

1、AppEurekaServer

package com.neohope.springcloud.test;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.RequestMapping;

@Configuration
@ComponentScan
@EnableAutoConfiguration
@EnableEurekaServer
public class AppEurekaServer 
{
	@RequestMapping("/appName")
	public String appName() {
		return System.getenv("spring.application.name");
	}
	
	public static void main(String[] args) {
		SpringApplication.run(AppEurekaServer.class, args);
		//new SpringApplicationBuilder(AppEurekaServer.class).web(true).run(args);
	}
}

2、pom.xml

<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>org.springframework.cloud.stream.app</groupId>
		<artifactId>app-starters-build</artifactId>
		<version>1.1.3.M1</version>
		<!--groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-netflix</artifactId> 
			<version>1.3.0.M1</version> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> 
			<version>1.4.4.RELEASE</version -->
	</parent>

	<groupId>com.neohope.springcloud.test</groupId>
	<artifactId>netflix-eureka-server</artifactId>
	<version>1.0.0</version>
	<packaging>jar</packaging>

	<name>netflix-eureka-server</name>
	<url>http://maven.apache.org</url>

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

	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka-server</artifactId>
			<version>1.3.0.M1</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot</artifactId>
			<version>1.5.1.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-autoconfigure</artifactId>
			<version>1.5.1.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<scope>test</scope>
		</dependency>
		<!--dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-zuul</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-ribbon</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-turbine-stream</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-turbine-amqp</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-turbine</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-spectator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-feign</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-atlas</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-archaius</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-netflix-turbine-stream</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-netflix-turbine</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-netflix-spectator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-netflix-hystrix-stream</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-netflix-hystrix-dashboard</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-netflix-hystrix-amqp</artifactId>
		</dependency-->
	</dependencies>

	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/libs-milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>
</project>

3、application.properties

spring.application.name=eureka-server
server.port=7000
security.user.name=user
security.user.password=eureka
eureka.instance.leaseRenewalIntervalInSeconds=5
eureka.instance.metadataMap.zone = zone1
eureka.server.enable-self-preservation=false
eureka.server.eviction-interval-timer-in-ms=5000
eureka.client.serviceUrl.defaultZone=http://user:eureka@localhost:7000/eureka/
eureka.client.registerWithEureka=false
eureka.client.fetchRegistry=false
eureka.client.preferSameZoneEureka = true

4、AppEurekaClient

package com.neohope.springcloud.test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.netflix.appinfo.InstanceInfo;
import com.netflix.discovery.EurekaClient;

@Configuration
@ComponentScan
@EnableAutoConfiguration
@EnableEurekaClient
//@EnableDiscoveryClient
@RestController
public class AppEurekaClient {
	
	//@Value("${spring.application.name}")
	//private String appName;
	
	@Autowired
	private EurekaClient discoveryClient;

	@RequestMapping("/serviceUrl")
	public String serviceUrl() {
	    //InstanceInfo instance = discoveryClient.getNextServerFromEureka("eureka-client", false);
	    //return instance.getHomePageUrl();
		return System.getenv("spring.application.name");
	}
	
	@RequestMapping("/")
	public String home() {
		return "It works!";
	}

	public static void main(String[] args) {
		new SpringApplicationBuilder(AppEurekaClient.class).web(true).run(args);
	}
}

5、pom.xml

<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>org.springframework.cloud.stream.app</groupId>
		<artifactId>app-starters-build</artifactId>
		<version>1.1.3.M1</version>
		<!--groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> 
			<version>1.4.4.RELEASE</version -->
	</parent>

	<groupId>com.neohope.springcloud.test</groupId>
	<artifactId>netflix-eureka-client</artifactId>
	<version>1.0.0</version>
	<packaging>jar</packaging>

	<name>netflix-eureka-client</name>
	<url>http://maven.apache.org</url>

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

	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>4.3.6.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
			<version>1.3.0.M1</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot</artifactId>
			<version>1.5.1.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-autoconfigure</artifactId>
			<version>1.5.1.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/libs-milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>
</project>

6、application.properties

spring.application.name=eureka-client
server.port=7001
security.user.name=user
security.user.password=eureka
eureka.client.serviceUrl.defaultZone=http://user:eureka@localhost:7000/eureka/
eureka.client.preferSameZoneEureka=true
eureka.client.healthcheck.enabled=true
eureka.instance.metadataMap.zone = zone1
eureka.instance.statusPageUrlPath=${management.context-path}/info
eureka.instance.healthCheckUrlPath=${management.context-path}/health
eureka.instance.lease-renewal-interval-in-seconds=5
eureka.instance.lease-expiration-duration-in-seconds=10