step1：修改hosts的ip地址映射，创建eureka集群

可参考：https://www.cnblogs.com/noneplus/p/11374883.html

step2：创建服务提供者

pom依赖

<?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>zkrun.top</groupId>

    <artifactId>msc-provider-5001</artifactId>

    <version>1.0-SNAPSHOT</version>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.1.7.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <java.version>1.8</java.version>

        <spring-cloud.version>Greenwich.SR2</spring-cloud.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-config</artifactId>

        </dependency>

        <!--        Eureka客户端启动需要依赖web模块-->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</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>

    <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>

</project>

application.yaml

server:

  port: 5001

spring:

  application:

    name: msc-provider  #应用名称

eureka:

  client:

    service-url:

      defaultZone: http://eureka4001.com:4001/eureka/,http://eureka4002.com:4002/eureka/,http://eureka4003.com:4003/eureka/

  instance:

    instance-id: msc-provider-5001

    prefer-ip-address: true     #访问路径可以显示IP地址

controller

package zkrun.top.controller;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class TestController {

    @GetMapping(value = "/info/get")

    public String response()

    {

        return "msc_provider_5001";

    }

}

主类

package zkrun.top;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication

@EnableEurekaClient

public class App_msc_provider_5001

{

    public static void main(String[] args)

    {

        SpringApplication.run(App_msc_provider_5001.class, args);

    }

}

step3：创建服务消费者【重要】

pom参考

<?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>zkrun.top</groupId>

    <artifactId>msc-consumer-9001</artifactId>

    <version>1.0-SNAPSHOT</version>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.1.7.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <java.version>1.8</java.version>

        <spring-cloud.version>Greenwich.SR2</spring-cloud.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-config</artifactId>

        </dependency>

        <!--        Eureka客户端启动需要依赖web模块-->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-openfeign</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>

    <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>

</project>

application.yaml

server:

  port: 9001

spring:

  application:

    name: consumer-9001

eureka:

  client:

    serviceUrl:

      defaultZone: http://eureka4001.com:4001/eureka/,http://eureka4002.com:4002/eureka/,http://eureka4003.com:4003/eureka/

management:

  endpoints:

    web:

      exposure:

        include: "*"

      cors:

        allowed-origins: "*"

        allowed-methods: "*"

使用Feign作为客户端调用工具

service接口

package zkrun.top.service;

import org.springframework.cloud.openfeign.FeignClient;

import org.springframework.stereotype.Component;

import org.springframework.web.bind.annotation.RequestMapping;

@FeignClient("msc-provider")    //@FeignClient("服务名")

@Component

public interface Hystrix_FeignService {

    @RequestMapping(value = "/info/get")

    public String request();

}

controller

package zkrun.top.controller;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RestController;

import zkrun.top.service.Hystrix_FeignService;

@RestController

public class Hystrix_FeignController {

    @Autowired

    Hystrix_FeignService hystrix_feignService;

    @RequestMapping(value = "/feign/info/get",method = RequestMethod.GET)

    @HystrixCommand(fallbackMethod = "hystrix_fallback")

    public String request()

    {

       return this.hystrix_feignService.request();

    }

    public String hystrix_fallback()

    {

        return "当前服务故障，服务熔断已启动！";

    }

}

主类（注解有点多）

package zkrun.top;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

import org.springframework.cloud.netflix.hystrix.EnableHystrix;

import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;

import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication

@EnableEurekaClient

@EnableHystrix

@EnableHystrixDashboard

@EnableCircuitBreaker

@EnableFeignClients

public class  App_Consumer_9001

{

   public static void main(String[] args)

   {

      SpringApplication.run(App_Consumer_9001.class, args);

   }

}

step4：Turbine监控服务

pom（spring-cloud-starter-netflix-turbine）

<?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>zkrun.top</groupId>

    <artifactId>msc-turbine-dashboard-8001</artifactId>

    <version>1.0-SNAPSHOT</version>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.1.7.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <java.version>1.8</java.version>

        <spring-cloud.version>Greenwich.SR2</spring-cloud.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-config</artifactId>

        </dependency>

        <!--        Eureka客户端启动需要依赖web模块-->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-openfeign</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>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-turbine</artifactId>

        </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>

</project>

application.yaml

server:

  port: 8001

spring:

  application:

    name: service-turbine

eureka:

  client:

    serviceUrl:

      defaultZone: http://eureka4001.com:4001/eureka/,http://eureka4002.com:4002/eureka/,http://eureka4003.com:4003/eureka/

management:

  endpoints:

    web:

      exposure:

        include: "*"

      cors:

        allowed-origins: "*"

        allowed-methods: "*"

turbine:

  app-config: consumer-9002,consumer-9001

  aggregator:

    clusterConfig: default

  clusterNameExpression: new String("default")

  combine-host: true

  instanceUrlSuffix:

    default: actuator/hystrix.stream

主类（注解）

package zkrun.top.zkrun.top;

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;

import org.springframework.cloud.netflix.hystrix.EnableHystrix;

import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;

import org.springframework.cloud.netflix.turbine.EnableTurbine;

@SpringBootApplication

@EnableEurekaClient

@EnableDiscoveryClient

@EnableHystrix

@EnableHystrixDashboard

@EnableCircuitBreaker

@EnableTurbine

public class TurbineService {

    public static void main(String[] args) {

        SpringApplication.run(TurbineService.class,args);

    }

}

测试

启动eureka集群，provider，两个consumer

客户端正常访问

登录监控面板：

http://localhost:8001/hystrix/

使用Jmeter做访问测试：

线程数1000
填写http访问相关信息

查看监控面板反应：

代码参考：

https://github.com/Noneplus/JavaDev-Note/tree/master/SpringCloud代码

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熔断监控Turbine

step1：修改hosts的ip地址映射，创建eureka集群

step2：创建服务提供者

step3：创建服务消费者【重要】

step4：Turbine监控服务

测试

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