场景

SpringCloud中集成Hystrix实现服务降级(从实例入手)：

SpringCloud中集成Hystrix实现服务降级(从实例入手)_霸道流氓气质的博客-CSDN博客

SpringCloud中集成Hystrix实现熔断(从实例入手)：

SpringCloud中集成Hystrix实现熔断(从实例入手)_霸道流氓气质的博客-CSDN博客

在上面集成Hystrix实现服务降级与熔断的基础上，怎样搭建可视化监控平台。

注：

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实现

1、与上面流程一样新建子模块cloud-consumer-hystrix-dashboard9002

pom文件中添加依赖

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>

2、新建并修改application.yml

server:
  port: 9002

3、新建启动类并添加@EnableHystrixDashboard注解

package com.badao.springclouddemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;


@SpringBootApplication
@EnableHystrixDashboard
public class HystrixDashboardMain9002
{
    public static void main(String[] args) {
            SpringApplication.run(HystrixDashboardMain9002.class, args);
    }
}

4、启动服务，访问

http://127.0.0.1:9002/hystrix

5、比如这里要监控服务提供者8001

则在输入框中输入

http://127.0.0.1:8001/hystrix.stream

然后Delay输入2000，Title输入T3,点击Monitor Stream

此时DashBoard提示 Unable to connect to Command Metric Stream

这是因为springcloud升级之后的bug,ServletRegistrationBean因为springboot的默认路径不是”/hystrix.stream”，

所以在8001主启动类中添加配置

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

完整启动类

package com.badao.springclouddemo;

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.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;


@SpringBootApplication
@EnableEurekaClient
@EnableCircuitBreaker
public class PaymentHystrixMain8001
{
    public static void main(String[] args) {
            SpringApplication.run(PaymentHystrixMain8001.class, args);
    }

    /**
     *此配置是为了服务监控而配置，与服务容错本身无关，springcloud升级后的坑
     *ServletRegistrationBean因为springboot的默认路径不是"/hystrix.stream"，
     *只要在自己的项目里配置上下面的servlet就可以了
     */
    @Bean
    public ServletRegistrationBean getServlet() {
        HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
        registrationBean.setLoadOnStartup(1);
        registrationBean.addUrlMappings("/hystrix.stream");
        registrationBean.setName("HystrixMetricsStreamServlet");
        return registrationBean;
    }
}

然后此时重新对8001进行监控，并调用8001的接口