修改工程：eureka-consumer-hystrix以支持hystrix
新建：spring-cloud-consumer-hystrix-dashboard（基本消费者一侧建立）

目标

• 熔断监控准备工作
• 熔断客户端允许监控
• Hystrix Dashboard

熔断监控准备工作

我们在熔断示例项目spring-cloud-consumer-hystrix的基础上更改，重新命名为：spring-cloud-consumer-hystrix-dashboard。

熔断客户端允许监控

工程：eureka-consumer-hystrix做如下修改
1）pom.xml增加如下配置

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        <version>2.0.0.RELEASE</version>
    </dependency>

2）增加配置文件，支持监控

package com.example.demo.config;

import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;

@Configuration
public class ConfigBean {
    @Bean
    public ServletRegistrationBean<HystrixMetricsStreamServlet> getServlet() {
        HystrixMetricsStreamServlet servlet = new HystrixMetricsStreamServlet();
        ServletRegistrationBean<HystrixMetricsStreamServlet> bean = new ServletRegistrationBean<>(servlet);
        bean.addUrlMappings("/hystrix.stream");
        bean.setName("HystrixMetricsStreamServlet");
        return bean;
    }
}

Hystrix Dashboard

1、添加依赖

    <?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.1.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <jdk.version>1.8</jdk.version>
        <spring.cloud.version>2.0.0.RELEASE</spring.cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
                  <!--以下三个包必须添加-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            <version>${spring.cloud.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
            <version>${spring.cloud.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2、启动类

启动类添加启用Hystrix Dashboard和熔断器

@SpringBootApplication
@EnableHystrixDashboard
public class DemoApplication {

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

application.properties

spring.application.name=spring-cloud-consumer-hystrix-dashboard
server.port=9002

3、测试

1）启动工程后访问

    http://localhost:9002/hystrix

2）地址栏输入监控地址并点击监控

image.png

3）访问如下网址：http://localhost:9001/hello/neo
4）查看监控页面

image.png