<!--引入hystrix依賴-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>

package com.you.Controller;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.you.mapper.DeptMapper;
import com.you.pojo.Dept;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
@ResponseBody
@Component
public class DeptController {
    @Autowired
    DeptMapper deptMapper;
    @GetMapping("/dept/aDept/{id}")
    @HystrixCommand(fallbackMethod = "hystrixGetDeptOfId")
    public Dept getDeptOfId(@PathVariable("id") Long id)
    {
        System.out.println("進來了,id是:"+id);
        Dept dept = deptMapper.finaDeptOfId(id);
        if(dept==null)
        {
            throw new RuntimeException("id=>"+id+"不存在該用戶，或者信息沒有找到!");
        }
        return dept;
    }
    /* 備用方案 */
    public Dept hystrixGetDeptOfId(@PathVariable("id") Long id)
    {
            Dept dept = new Dept();
            dept.setDeptno(id);
            dept.setDeptname("id=>"+id+"不存在該用戶，或信息沒有找到!@Hystrix");
            dept.setDb_source("no info in datebase");
            System.out.println("dept的值是:"+dept);
            return dept;
    }
}

package com.you.service;
import com.you.pojo.Dept;
import feign.hystrix.FallbackFactory;
import org.springframework.stereotype.Component;
/*?。?！降級?。?！*/
@Component  //注冊到容器里面去
public class DeptClientFailBackFactory implements FallbackFactory {
    @Override
    public DeptClientService create(Throwable throwable) {
        return new DeptClientService() {
            @Override
            public Dept getDeptOfId(Long id) {
                Dept dept = new Dept();
                dept.setDeptno(id);
                dept.setDeptname("id=>"+id+"沒有對應(yīng)的信息，客戶端提供了降級的信息，這個服務(wù)現(xiàn)在被關(guān)閉了！");
                dept.setDb_source("沒有數(shù)據(jù)");
                return dept;
            }
        };
    }
}

package com.you.service;
import com.you.pojo.Dept;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
@Component
/*@FeignClient:value的值即為 服務(wù)的名字，fallbackFactory的值即為 實現(xiàn)FallbackFactory類的名字 */
@FeignClient(value = "SPRINGCLOUD-PROVIDER-DEPT",fallbackFactory = DeptClientFailBackFactory.class)
public interface DeptClientService {
    @GetMapping("/dept/aDept/{id}")
    public Dept getDeptOfId(@PathVariable("id") Long id);
}

 <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.you</groupId>
            <artifactId>springcloud-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <!--引入Eureka的依賴-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>
        <!--引入ribbon-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-ribbon</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>
        <!--引入DashBorder-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>
        <!--引入hystrix依賴-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>
    </dependencies>

package com.you;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
@SpringBootApplication
@EnableHystrixDashboard
public class DeptConsumerDashBorder_9001 {
    public static void main(String[] args) {
        SpringApplication.run(DeptConsumerDashBorder_9001.class,args);
    }
}

package com.you;
import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
/*對熔斷的支持*/
@EnableCircuitBreaker
public class DeptApplication_Hystrix_8001 {
    public static void main(String[] args) {
        SpringApplication.run(DeptApplication_Hystrix_8001.class,args);
    }
    @Bean
    public ServletRegistrationBean hystrixMetricsStreamServlet(){
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(new HystrixMetricsStreamServlet());
        //訪問該頁面就是監(jiān)控頁面
        registrationBean.addUrlMappings("/actuator/hystrix.stream");
        return registrationBean;
    }
}