hystrix dashboard Unable to connect to Command Metric Stream

最近在学习Springcloud ，实践hystrix dashboard仪表盘的时候，不管是按照书上的还是网上的，都提示Unable to connect to Command Metric Stream。看起来很心烦啊,直到看到了一篇博客:
https://blog.csdn.net/ddxd0406/article/details/79643059

多余的话不说,我当时的项目环境如下:

<dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-openfeign -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>


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

        <!-- 熔断器依赖 -->
        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-hystrix -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>

        <!-- 熔断器仪表盘依赖 hystrix-dashboard监控 -->
        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-hystrix-dashboard -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>

        <!-- 监控中心 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>


    </dependencies>

启动类

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
@EnableCircuitBreaker
@EnableHystrixDashboard
public class AppHystrixDashboardConsumer {

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

该引用的依赖都有,该添加的注解也都有,就是死活访问异常,看到上面的博客链接后才发现原来是Springboot2.0后并没有实现下面的servlet，导致访问一直404
改进后代码:

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
@EnableCircuitBreaker
@EnableHystrixDashboard
public class AppHystrixDashboardConsumer {

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


    @Bean
    public ServletRegistrationBean getServlet(){
        HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
        registrationBean.setLoadOnStartup(1);
//        registrationBean.addUrlMappings("/actuator/hystrix.stream");  // 这里指定的urlMapping 就是我们在仪表盘中monitor Stream 的地址后缀
        registrationBean.addUrlMappings("/test/hystrix.stream");
        registrationBean.setName("HystrixMetricsStreamServlet");
        return registrationBean;
    }
}

这里我指定的urlMapping 是/test/hystrix.stream 那么我在monitor stream 的时候填写的地址就是:
http://ip:port/test/hystrix.stream
至此，我们的仪表盘就正常工作了