前文回顾：
Spring Cloud(一）Eureka Server-单体及集群搭建
本节我们将创建两个Eureka Client，注册到上节中的Eureka Server中，一个作为服务提供方，一个作为服务调用方。
一.服务提供方（生产者）
1.pom中添加依赖
<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.3.RELEASE</version><relativePath/></parent><properties><java.version>1.8</java.version><spring-cloud.version>Greenwich.RELEASE</spring-cloud.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><version>2.1.0.RELEASE</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><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>
2.Application启动类中添加注解
@EuableDiscoveryClient：就是一个自动发现客户端的实现
@SpringBootApplication@EnableDiscoveryClientpublic class ProducerApplication {public static void main(String[] args) {SpringApplication.run(ProducerApplication.class, args);}}
3.配置文件
spring.application.name=spring-cloud-producerserver.port=9000eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/
4.提供服务
@RestControllerpublic class HelloController {@RequestMapping("/hello")public String index(@RequestParam String name) {return "hello " + name + "，welcome to Spring Cloud";}}
二.服务调用方（消费者）
1.pom中添加依赖
<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.3.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.yfy</groupId><artifactId>consumer</artifactId><version>0.0.1-SNAPSHOT</version><name>consumer</name><description>Demo project for Spring Boot</description><properties><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><version>2.1.0.RELEASE</version></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId><version>2.1.0.RELEASE</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies>
2.Application启动类中添加注解
@EnableDiscoveryClient:启用服务注册与发现
@EnableFeignClients：启用feign进行远程调用
@SpringBootApplication@EnableDiscoveryClient@EnableFeignClientspublic class ConsumerApplication {public static void main(String[] args) {SpringApplication.run(ConsumerApplication.class, args);}}
3.配置文件
spring.application.name=spring-cloud-consumerserver.port=9001eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/feign.hystrix.enabled=true
4.Feign调用实现
@FeignClient(name= "spring-cloud-producer",fallback = HelloRemoteHystrix.class)public interface HelloRemote {@RequestMapping(value = "/hello")String hello(@RequestParam(value = "name") String name);}
5.web层调用远程服务
@RestControllerpublic class HelloController {@AutowiredHelloRemote helloremote;@RequestMapping("/hello/{name}")public String index(@PathVariable("name") String name) {return helloremote.hello(name);}}
三.测试
依次启动spring-cloud-eureka、spring-cloud-producer、spring-cloud-consumer三个项目
浏览器中输入：http://localhost:9001/hello/yfy
返回：hello yfy，welcome to Spring Cloud
4.负载均衡测试
将生产者的controller方法修改为
@RestControllerpublic class HelloController {@RequestMapping("/hello")public String index(@RequestParam String name) {return "hello " + name + "，welcome to Spring Cloud:product2";}}
再启动一个生产者，端口为9003
浏览器中输入：http://localhost:9001/hello/yfy
第一次返回：hello yfy，welcome to Spring Cloud
第一次返回：`hello yfy，welcome to Spring Cloud:product2
不断的进行测试下去会发现两种结果交替出现，说明两个服务中心自动提供了服务均衡负载的功能。
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