1、POM配置
和普通Spring Boot工程相比，添加了Eureka Client、Feign、Hystrix依赖和Spring Cloud依赖管理
<dependencies>
<!--Eureka Client依赖-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<!--声明式服务消费-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
<!-- 整合断路器hystrix，其实feign中自带了hystrix，引入该依赖主要是为了使用其中的hystrix-metrics-event-stream，用于dashboard -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>
<!-- 服务健康检查，必须添加，否则此服务不会启动hystrix.stream -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
</dependencies>
<!--Spring Cloud依赖版本管理-->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
02、使能
@SpringBootApplication
@EnableFeignClients //声明式服务消费
@EnableCircuitBreaker //断路器
@EnableEurekaClient //Eureka客户端
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
03、src/main/resources工程配置文件 application.yml
server:
port: 3010
spring:
application:
name: feign-hello-service-consumer
eureka:
client:
serviceUrl:
defaultZone: http://discovery:1000/eureka/
feign:
hystrix:
enabled: true #在新版本Feign中，hystrix默认关闭，必须手动打开
04、声明式服务消费
@FeignClient(name = "hello-service-provider", fallback = HelloFallback.class)
public interface HelloFeignService {
@RequestMapping("/hello")
public String hello(); } @Component
class HelloFallback implements HelloFeignService { @Override
public String hello() {
return "Error";
}
}
05、Controller
@RestController
public class FeignController {
@Autowired
private HelloFeignService helloService; @GetMapping("feign")
public String hello() {
return this.helloService.hello();
}
}