SpringCloud 学习 | 第六篇： feign断路器使用（hystrix）

springcloud Feign已经实现了Hystrix ,所以不用再引Hystrix的maven依赖

创建springboot应用

pom.xml如下

<?xml version="1.0" encoding="UTF-8"?>
<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>

	<groupId>com.example</groupId>
	<artifactId>service_feign_hystrix</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>service_feign_hystrix</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
		<spring-cloud.version>Finchley.M8</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-openfeign</artifactId>
		</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>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

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


</project>

Feign是自带断路器的，在D版本的Spring Cloud中，它没有默认打开。需要在配置文件中配置打开它：

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/,http://localhost:8760/eureka/
server:
  port: 8768

spring:
  application:
    name: service_feign_hystrix
feign:
  hystrix:
    enabled: true   #打开Feign自带的断路器

编辑启动类添加@EnableFeignClients 开启feign

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class ServiceFeignHystrixApplication {

	public static void main(String[] args) {
		SpringApplication.run(ServiceFeignHystrixApplication.class, args);
	}
}

修改feign接口 

//通过@ FeignClient（“服务名”），来指定调用哪个服务。比如在代码中调用了service-hi服务的“/hi”接口，还可以使用url参数指定一个URL  fallback  出现错误回调类
@FeignClient(value = "SUPPLY-HI", fallback = HiSendImpl.class)
public interface HiSend {

    @RequestMapping(value = "/hi", method = RequestMethod.GET)
    String sayHiFromClientOne(@RequestParam(value = "name") String name);//添加参数name 相当于/hi?name=xxx
}

feign接口实现类

@Component
public class HiSendImpl implements HiSend {

    @Override
    public String sayHiFromClientOne(String name) {
        return "异常！";
    }
}

测试关闭一个服务提供者请求http://localhost:8768/hi?name=forezp

完成！

最后

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