一、Hystrix Dashboard简介
在微服务架构中为例保证程序的可用性，防止程序出错导致网络阻塞，出现了断路器模型。断路器的状况反应了一个程序的可用性和健壮性，它是一个重要指标。Hystrix Dashboard是作为断路器状态的一个组件，提供了数据监控和友好的图形化界面。
二、准备工作
本文的的工程栗子，来源于SpringCloud教程第1篇：Eureka（F版本）的栗子，在它的基础上进行改造。
三、开始改造service-hi
在pom的工程文件引入相应的依赖：
<?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>com.forezp</groupId> <artifactId>service-hi</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>service-hi</name> <description>Demo project for Spring Boot</description> <parent> <groupId>com.forezp</groupId> <artifactId>sc-f-chapter12</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <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-web</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> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
在程序的入口ServiceHiApplication类，加上@EnableHystrix注解开启断路器，这个是必须的，并且需要在程序中声明断路点HystrixCommand；加上@EnableHystrixDashboard注解，开启HystrixDashboard
package com.forezp.servicehi; import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand; import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.SpringCloudApplication; 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.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; @SpringBootApplication @EnableEurekaClient @EnableDiscoveryClient @RestController @EnableHystrix @EnableHystrixDashboard @EnableCircuitBreaker public class ServiceHiApplication { /** * 访问地址 http://localhost:8762/actuator/hystrix.stream * @param args */ public static void main(String[] args) { SpringApplication.run( ServiceHiApplication.class, args ); } @Value("${server.port}") String port; @RequestMapping("/hi") @HystrixCommand(fallbackMethod = "hiError") public String home(@RequestParam(value = "name", defaultValue = "forezp") String name) { return "hi " + name + " ,i am from port:" + port; } public String hiError(String name) { return "hi,"+name+",sorry,error!"; } }
配置yml文件
server:
port: 8762
spring:
application:
name: service-hi
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
management:
endpoints:
web:
exposure:
include: "*"
cors:
allowed-origins: "*"
allowed-methods: "*"
运行程序： 依次开启eureka-server 和service-hi.
四、Hystrix Dashboard图形展示
调用IT虾米网 如果不调用的话下一步操作 网页就一直ping 并不会返回任何信息
打开http://localhost:8762/actuator/hystrix.stream，可以看到一些具体的数据：
打开IT虾米网可以看见以下界面：
在界面依次输入：http://localhost:8762/actuator/hystrix.stream 、2000 、miya ；点确定。
在另一个窗口输入： http://localhost:8762/hi?name=forezp
重新刷新hystrix.stream网页，你会看到良好的图形化界面：
源码下载： IT虾米网
