实现Hystrix-Dashboard

首先，创建一个新的项目，名称就是“hystrix-dashboard”，需要加入的依赖有spring-cloud-starter-hystrix，spring-cloud-starter-hystrix-dashboard，spring-cloud-starter-hystrix-actuator，完整的POM文件如下：

<?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>
	<parent>
		<groupId>org.springframework.cloud</groupId>
		<artifactId>spring-cloud-starter-parent</artifactId>
		<version>Finchley.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.sc</groupId>
	<artifactId>hystrix-dashboard</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>hystrix-dashboard</name>
	<description>Demo project for Spring Cloud Hystrix dashboard</description>

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

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

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

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
			<version>2.1.1.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
			<version>2.1.1.RELEASE</version>
		</dependency>

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

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

在application层面必须注入@EnableHystrixDashboard

package com.sc.hystrixdashboard;

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

@EnableHystrixDashboard
@SpringBootApplication
public class HystrixDashboardApplication {

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

}

运行后，假设开的端口为8085，应用名称为hystrix-dashboard

spring.application.name=hystrix-dashboard
server.port=8085

打开后的效果如下：http://localhost:8085/hystrix

这里，我们回到对ribbon-consumer的改造，在pom文件里加入依赖：

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

在application.properties加入配置：

management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always
management.endpoint.shutdown.enabled=true

在应用层面注册HystrixMetricsStreamServlet进入ServletRegistrationBean

package com.sc.consumerribbon;

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.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@EnableCircuitBreaker
@SpringBootApplication
@EnableDiscoveryClient
public class ConsumerRibbonApplication {

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

	@Bean
	@LoadBalanced
	public RestTemplate restTemplate(){
		return new RestTemplate();
	}

	@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;
	}
}

重新运行ribbon-consumer，然后在刚才的Hystrix-Dashboard输入http://127.0.0.1:9000/hystrix.stream

点击Monitor Stream，跳到如下界面：

其中，getHello下面的百分比是最近10秒的错误率，比如，连续调用10次；

具体含义如下：

实心圆：其有两种含义。通过颜色的变化代表了实例的健康程度，如下图所示，它的健康度从绿色、黄色、橙色、红色递减。该实心圆除了颜色的变化之外，它的大小也会根据实例的请求流量发生变化，流量越大该实心圆就越大。所以通过该实心圆的展示，我们可以在大量的实例中快速发现故障实例和高压力实例。

曲线：用来记录2分钟内流量的相对变化，可以通过它来观察流量的上升和下降趋势。

最后

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