spring cloud 在初次使用 hystrix dashboard仪表盘的时候很容易出现hystrix dashboard Unable to connect to Command Metric Stream错误

如下图：

image

首先查看依赖时候添加全

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
    <version>1.4.7.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
    <version>1.4.7.RELEASE</version>
        </dependency>

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

其次启动程序注解是否添加

@EnableCircuitBreaker
@EnableHystrixDashboard
如果都没问题那么检查下springboot 版本如果是2.0则需要添加 ServletRegistrationBean 因为springboot的默认路径不是 "/hystrix.stream"，只要在自己的项目里配置上下面的servlet就可以了

@EnableDiscoveryClient
@EnableFeignClients
@SpringBootApplication
@EnableHystrixDashboard
@EnableCircuitBreaker
public class Consumer1Application {
    public static void main(String[] args) {
        SpringApplication.run(Consumer1Application.class, args);
    }


@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;
 }
}

修改完成重启服务问题便会解决

image

分析：