Hystrix + Hystrix Dashboard搭建（Spring Cloud 2.X）

本机IP为 192.168.1.102

一、搭建Hystrix Dashboard

1. 新建 Maven 项目 hystrix-dashboard

2. pom.xml

<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.java</groupId>

    <artifactId>hystrix-dashboard</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <name>${project.artifactId}</name>

    <!-- 配置版本常量 -->

    <properties>

        <jdk.version>1.8</jdk.version>

        <spring.cloud.version>2.0.0.RELEASE</spring.cloud.version>

    </properties>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.0.5.RELEASE</version>

    </parent>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <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>

    </dependencies>

    <build>

        <finalName>${project.artifactId}</finalName>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <configuration>

                    <source>${jdk.version}</source>

                    <target>${jdk.version}</target>

                    <encoding>UTF-8</encoding>

                </configuration>

            </plugin>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <executions>

                    <execution>

                        <goals>

                            <goal>repackage</goal>

                        </goals>

                    </execution>

                </executions>

            </plugin>

        </plugins>

    </build>

</project>

3. application.yml

server:

  port: 9999

4. HystrixDashboardStarter.java

package com.java.hystrix.dashboard;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.builder.SpringApplicationBuilder;

import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;

@SpringBootApplication

@EnableHystrixDashboard

public class HystrixDashboardStarter extends SpringBootServletInitializer {

    public static void main(String[] args) {

        SpringApplication.run(HystrixDashboardStarter.class, args);

    }

    @Override

    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {

        return builder.sources(HystrixDashboardStarter.class);

    }

}

5. 运行 HystrixDashboardStarter.java

浏览器打开URL

http://192.168.1.102:9999/hystrix/

或

http://127.0.0.1:9999/hystrix/

截图如下：

Hystrix Dashboard搭建成功！

二、搭建 Hystrix

1. 新建 Maven 项目 hystrix

2. pom.xml

<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.java</groupId>

    <artifactId>hystrix</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <name>${project.artifactId}</name>

    <!-- 配置版本常量 -->

    <properties>

        <jdk.version>1.8</jdk.version>

    </properties>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.0.5.RELEASE</version>

    </parent>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

            <version>2.0.0.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>

            <version>2.0.0.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <!-- 热部署 -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>springloaded</artifactId>

            <version>1.2.8.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

        </dependency>

    </dependencies>

    <build>

        <finalName>${project.artifactId}</finalName>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <configuration>

                    <source>${jdk.version}</source>

                    <target>${jdk.version}</target>

                    <encoding>UTF-8</encoding>

                </configuration>

            </plugin>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <executions>

                    <execution>

                        <goals>

                            <goal>repackage</goal>

                        </goals>

                    </execution>

                </executions>

            </plugin>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-resources-plugin</artifactId>

                <configuration>

                    <delimiters>

                        <delimit>$</delimit>

                    </delimiters>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

3. application.yml

server:

  port: 8888

spring:

  application:

    name: hystrix

eureka:

  client:

    service-url:

      defaultZone: http://192.168.1.102:8080/eureka

  instance:

    instance-id: hystrix.java.com

    prefer-ip-address: true #访问路径可以显示IP地址    

info:

  app.name: hystrix

  app.update: 2018-10-07

  build.groupId: $project.groupId$

  build.artifactId: $project.artifactId$

  build.version: $project.version$

4. HostController.java

package com.java.hystrix.controller;

import java.net.InetAddress;

import java.net.UnknownHostException;

import java.util.HashMap;

import java.util.Map;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RestController;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;

@RestController

public class HostController {

    @GetMapping("/getHostMessage/{id}")

    @HystrixCommand(fallbackMethod = "getHostMessageFallback")

    public Map<String, Object> getHostMessage(@PathVariable String id) {

        if ("error".equals(id)) {

            throw new RuntimeException("测试异常演习！");

        }

        Map<String, Object> map = new HashMap<>();

        try {

            InetAddress serverHost = InetAddress.getLocalHost();

            map.put("hostname", serverHost.getHostName());

            map.put("hostAddress", serverHost.getHostAddress());

            map.put("id", id);

            return map;

        } catch (UnknownHostException e) {

            e.printStackTrace();

            map.put("msg", e.getMessage());

            throw new RuntimeException(e.getMessage());

        }

    }

    public Map<String, Object> getHostMessageFallback(@PathVariable String id) {

        Map<String, Object> map = new HashMap<>();

        map.put("id", id);

        map.put("description", "异常演习Fallback！");

        return map;

    }

}

5. ConfigBean.java

package com.java.hystrix.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;

    }

}

6. HystrixStarter.java

package com.java.hystrix;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.builder.SpringApplicationBuilder;

import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;

import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient

@EnableCircuitBreaker

@EnableDiscoveryClient

@SpringBootApplication

public class HystrixStarter extends SpringBootServletInitializer {

    public static void main(String[] args) {

        SpringApplication.run(HystrixStarter.class, args);

    }

    @Override

    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {

        return builder.sources(HystrixStarter.class);

    }

}

7. 运行测试

启动 Eureka 服务注册中心，参考 https://www.cnblogs.com/jonban/p/eureka.html

运行 HystrixStarter.java

浏览器输入URL

http://192.168.1.102:8888/getHostMessage/hello

或

http://127.0.0.1:8888/getHostMessage/hello

返回数据如下：

{"hostname":"F6RK2EXYAFARPPS","hostAddress":"192.168.1.102","id":"hello"

截图如下：

Hystrix 搭建成功！

三、使用 Hystrix Dashboard 监控 Hystrix 服务

在 Hystrix Dashboard 监控页面（http://127.0.0.1:9999/hystrix/）输入Hystrix 的监控地址

http://192.168.1.102:8888/hystrix.stream

截图如下：

单击【Monitor Stream】按钮，开始监控，截图如下：

连续多次请求Hystrix 服务的URL

http://192.168.1.102:8888/getHostMessage/hello

切换到仪表盘页面观察，监控开始变化。

监控仪表盘功能正常

搭建完毕！

技术要点提炼

只要在被监控项目上加入相关依赖和配置并开启注解即可

内容如下：

<dependency>

    <groupId>org.springframework.cloud</groupId>

    <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>

    <version>2.0.0.RELEASE</version>

</dependency>

<dependency>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-actuator</artifactId>

    <version>2.0.5.RELEASE</version>

</dependency>

@EnableCircuitBreaker

@EnableDiscoveryClient

package com.java.hystrix.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;

    }

}

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