解决方法：

1,检查是否添加以下依赖

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

<!-- hystrix 断路器-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>

<!-- hystrix-dashboard监控 -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
</dependency>

2,springboot启动程序是否设置@EnableHystrixDashboard、@EnableCircuitBreaker注解

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

3,是否在服务方法上添加  @HystrixCommand配置

         @HystrixCommand(fallbackMethod = "addFallBack",
    threadPoolProperties = {
            @HystrixProperty(name = "coreSize", value = "30"),
            @HystrixProperty(name = "maxQueueSize", value = "101"),
            @HystrixProperty(name = "keepAliveTimeMinutes", value = "2"),
            @HystrixProperty(name = "queueSizeRejectionThreshold", value = "15"),
            @HystrixProperty(name = "metrics.rollingStats.numBuckets", value = "12"),
            @HystrixProperty(name = "metrics.rollingStats.timeInMilliseconds", value = "1440")
            },
       commandProperties = {
            @HystrixProperty(name="execution.isolation.strategy", value="SEMAPHORE"),
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "100"),  
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "50")
    })  

4,hystrix dashboard主页是否正确设置Monitor Stream

一般为：域名：端口/hystrix.stream