13 hystrix dashboard Unable to c

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：

1208986-20180423163902260-1404444821.png

首先查看依赖时候添加全

<?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>2.1.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.taotao</groupId>
    <artifactId>consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>consumer</name>
    <description>Demo project for Spring Boot</description>

<properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.RC2</spring-cloud.version>
    </properties>

<dependencies>

        <dependency>
            <groupId>com.netflix.hystrix</groupId>
            <artifactId>hystrix-javanica</artifactId>
            <version>RELEASE</version>
        </dependency>


    <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
            <version>1.3.0.RELEASE</version>
        </dependency>

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

    <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>
        </dependency>

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

    <scope>test</scope>
        </dependency>
    </dependencies>
<dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                    <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>

</project>

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
@EnableEurekaClient
@SpringBootApplication
@EnableHystrix
@EnableHystrixDashboard
@EnableCircuitBreaker
public class ConsumerApplication {

    public static void main(String[] args) {
        SpringApplication.run(ConsumerApplication.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

1208986-20180423163902260-1404444821.png

controller

@RestController
public class ConsumerController {
@Autowired
HelloRemote helloRemote;

@RequestMapping("/hello")
public String hello(String name){
    return  helloRemote.hello(name);
}

@RequestMapping("/getOrderName")
public  String getOrderName(String name){
    return  helloRemote.getName(name);
}

}

feign

@FeignClient(name="spring-cloud-producer")
public interface HelloRemote {
//在HelloRemote类添加指定fallback类，在服务熔断的时候返回fallback类中的内容。
@RequestMapping("/hello")
public String hello(@RequestParam(value = "name") String name);
@RequestMapping("/getName")
public String getName(@RequestParam("name") String name); //必须加上@RequestParam("name") 才能传值
}

访问： 

访问http://localhost:9001/hystrix.stream 也会不断的显示ping。

请求服务http://localhost:9001/hello/neo，就可以看到监控的效果了，首先访问http://localhost:9001/hystrix.stream