前文回顧：

Spring Cloud(一）Eureka Server-單體及集群搭建

本節我們將創建兩個Eureka Client，注冊到上節中的Eureka Server中，一個作為服務提供方，一個作為服務調用方。

一.服務提供方（生產者）

1.pom中添加依賴

? <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啟動類中添加注解

• @EuableDiscoveryClient：就是一個自動發現客戶端的實現

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

3.配置文件

spring.application.name=spring-cloud-producer server.port=9000 eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/

4.提供服務

@RestController public class HelloController { ?@RequestMapping("/hello")public String index(@RequestParam String name) {return "hello " + name + "，welcome to Spring Cloud";} }

二.服務調用方（消費者）

1.pom中添加依賴

? ?<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啟動類中添加注解

• @EnableDiscoveryClient :啟用服務注冊與發現

• @EnableFeignClients：啟用feign進行遠程調用

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

3.配置文件

spring.application.name=spring-cloud-consumer server.port=9001 eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/ feign.hystrix.enabled=true

4.Feign調用實現

@FeignClient(name= "spring-cloud-producer",fallback = HelloRemoteHystrix.class) public interface HelloRemote { ?@RequestMapping(value = "/hello")String hello(@RequestParam(value = "name") String name); }

5.web層調用遠程服務

@RestController public class HelloController {@AutowiredHelloRemote helloremote;@RequestMapping("/hello/{name}")public String index(@PathVariable("name") String name) {return helloremote.hello(name);} }

三.測試

依次啟動spring-cloud-eureka、spring-cloud-producer、spring-cloud-consumer三個項目

瀏覽器中輸入：http://localhost:9001/hello/yfy

返回：hello yfy，welcome to Spring Cloud

4.負載均衡測試

將生產者的controller方法修改為

@RestController public class HelloController {@RequestMapping("/hello")public String index(@RequestParam String name) {return "hello " + name + "，welcome to Spring Cloud:product2";} }

再啟動一個生產者，端口為9003

?

瀏覽器中輸入：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

不斷的進行測試下去會發現兩種結果交替出現，說明兩個服務中心自動提供了服務均衡負載的功能。

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