<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-hystrix</artifactId></dependency>

package org.maple;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;/*** @author mapleins* @Date 2019-01-12 17:13* @Desc**/
@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient//服务发现 可以看到服务信息
@EnableCircuitBreaker //开启断路器
public class App_Provider_Dept_8001_Hystrix {public static void main(String[] args) {SpringApplication.run(App_Provider_Dept_8001_Hystrix.class,args);}
}

    @GetMapping("/dept/get/{id}")//出错调用hystrixCommand中的方法@HystrixCommand(fallbackMethod = "hystrix_get")public Dept get(@PathVariable("id") Long id) {Dept dept = service.find(id);if (null == dept) {throw new RuntimeException("该id"+id+"没有对应信息");}return dept;}public Dept hystrix_get(@PathVariable("id") Long id){return new Dept().setDeptNo(id).setDName("该id"+id+"没有对应的信息，null--@HystrixCommand").setDb_source("no this database in Mysql");}

package org.maple.service;import feign.hystrix.FallbackFactory;
import org.maple.entity.Dept;
import org.springframework.stereotype.Component;import java.util.List;/*** @author mapleins* @Date 2019-01-13 12:01* @Desc 服务降级**/
@Component
public class DeptClientServiceFallbackFactory implements FallbackFactory<DeptClientService> {@Overridepublic DeptClientService create(Throwable throwable) {return new DeptClientService() {@Overridepublic boolean add(Dept dept) {return false;}@Overridepublic Dept get(Long id) {return new Dept().setDeptNo(id).setDName("该服务已经关闭").setDb_source("no this database in Mysql");}@Overridepublic List<Dept> list() {return null;}};}
}

package org.maple.service;import org.maple.entity.Dept;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;import java.util.List;/*** @author mapleins* @Date 2019-01-12 23:10* @Desc 通过接口和注解 面向接口编程访问微服务**/
//@FeignClient("ms-provider-dept")
@FeignClient(value = "ms-provider-dept",fallbackFactory = DeptClientServiceFallbackFactory.class) //服务降级类
public interface DeptClientService {@PostMapping("/dept/add")boolean add(@RequestBody Dept dept);@GetMapping("/dept/get/{id}")Dept get(@PathVariable("id") Long id);@GetMapping("/dept/list")List<Dept> list();}

feign:hystrix:enabled: true #开启服务降级

        <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency>

<?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"><parent><artifactId>spring-cloud-learning</artifactId><groupId>org.org.maple</groupId><version>0.0.1-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>ms-consumer-hystrix-dashboard</artifactId><dependencies><dependency><groupId>org.org.maple</groupId><artifactId>ms-common-api</artifactId><version>0.0.1-SNAPSHOT</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-hystrix</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId></dependency></dependencies></project>

server:port: 9001

package org.maple;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;/*** @author mapleins* @Date 2019-01-13 12:44* @Desc**/
@SpringBootApplication
@EnableHystrixDashboard //开启仪表盘
public class App_Hystrix_Dashboard_9001 {public static void main(String[] args) {SpringApplication.run(App_Hystrix_Dashboard_9001.class,args);}
}

    @Beanpublic ServletRegistrationBean getServlet() {HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);registrationBean.setLoadOnStartup(1);registrationBean.addUrlMappings("/hystrix.stream");registrationBean.setName("HystrixMetricsStreamServlet");return registrationBean;}