【SpringCloud深入浅出系列】SpringCloud组件之集成Hystrix Dashboard

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一、Hystrix Dashboard 是什么？

Hystrix 仪表盘主要用来监控 Hystrix 的实时运行状态，通过它我们可以看到 Hystrix 的各项指标信息，从而快速发现系统中存在的问题进而解决它。

二、创建项目实现 Hystrix Dashboard

1.添加依赖

pom.xml 文件中加入依赖 spring-boot-starter-actuator 和 spring-cloud-starter-netflix-hystrix-dashboard，spring-boot-starter-actuator 为服务监控依赖：

    
        org.springframework.boot
        spring-boot-starter-actuator
       
     
        org.springframework.cloud
        spring-cloud-starter-netflix-hystrix-dashboard
    

2.添加配置

application.yml 文件中添加配置用来暴露 endpoints，由于 endpoints 中会包含很多敏感信息，除了 health 和 info 两个支持直接访问外，其他的默认不能直接访问，所以进行指定：

management:
  endpoints:
    web:
      exposure:
        include: hystrix.stream

3.启动类加入注解

在启动类中加入注解 @EnableHystrixDashboard，开启Hystrix Dashboard：

package com.chaoyue.consumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
@EnableHystrixDashboard
public class ConsumerApplication {

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

}

4.启动类注入 ServletRegistrationBean

在启动类注入 ServletRegistrationBean，该 Bean 的作用是在 Hystrix Dashboard 中打开 hystrix.stream：

package com.chaoyue.consumer;

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.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
@EnableHystrixDashboard
public class ConsumerApplication {

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

    @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;
    }
}

5.启动服务

启动服务。浏览器输入：http://localhost:8082/hystrix

监控 Stream 输入：http://localhost:8082/hystrix.stream，点击【Monitor Stream】