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
@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.提供服务
@RestController
public 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
@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
@RestController
public class HelloController {
@Autowired
HelloRemote 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
@RestController
public 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。