springcloud-Dashboard 流量监控 (九）

新建springcloud-consumer-dashboard-82模块

pom.xml

关键依赖

<dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
     <version>1.4.6.RELEASE</version>
 </dependency>
 <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-actuator</artifactId>
 </dependency>
 <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-hystrix</artifactId>
      <version>1.4.6.RELEASE</version>
  </dependency>

其它依赖

<!--Feign的依赖-->
  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-feign</artifactId>
      <version>1.4.6.RELEASE</version>
  </dependency>
  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-eureka</artifactId>
      <version>1.4.6.RELEASE</version>
  </dependency>
  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-ribbon</artifactId>
      <version>1.4.6.RELEASE</version>
  </dependency>
  <dependency>
      <groupId>com.dong</groupId>
      <artifactId>springcloud-common</artifactId>
      <version>1.0-SNAPSHOT</version>
  </dependency>
  <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <!--热部署工具-->
  <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-devtools</artifactId>
  </dependency>

application.yml

server:
  port: 82

主启动类 @EnableHystrixDashboard开启流量监控

package com.dong.consumer3;

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

到此dashboard流量监控模块就搭建完毕了。（可以认为它是一个工具，用来监控某个模块的访问量）

springcloud-provider-8001 配置流量监控

添加依赖

<dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-hystrix</artifactId>
      <version>1.4.6.RELEASE</version>
  </dependency>
  <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-actuator</artifactId>
  </dependency>

主启动类关键注解@EnableDiscoveryClient

注意：起初没有使用@EnableCircuitBreaker注解，访问http://localhost:8001/actuator/hystrix.stream 一直z在ping。并且流量监控页面也是一直loading。最后发现需要加上@EnableCircuitBreaker 添加熔断的支持。

package com.dong.provider;

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

    @Bean
    public ServletRegistrationBean hystrixMetricsStreamServlet(){
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(new HystrixMetricsStreamServlet());
        //访问该页面就是监控页面
        registrationBean.addUrlMappings("/actuator/hystrix.stream");
        registrationBean.setName("HystrixMetricsStreamServlet");
        return registrationBean;
    }
}

controller 访问的接口上加一个@HystrixCommand注解，可以不写相关熔断的方法。监控页面就可以监控到了。（此注解的详细用户见服务熔断）

    @GetMapping("/dept/get/{id}")
    @HystrixCommand
    public Dept getDept(@PathVariable("id") Long id) {
        Dept dept = deptService.queryById(id);
        if (dept == null) {
            throw new RuntimeException("Fail");
        }
        return dept;
    }