Springcloud项目中添加熔断器hystrix并集成dashboard查看

一、新建module,与服务的提供者为同级

除Springcloud基本依赖添加下面依赖

 1 　　　　 <!--仪表盘-->
 2         <dependency>
 3             <groupId>org.springframework.cloud</groupId>
 4             <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
 5         </dependency>

二、编写配置文件application.yml

 server:
    port: 5666

#忘记仪表盘会出现Unable to connect to Command Metric Stream

  hystrix:
    dashboard:
      proxy-stream-allow-list: "*"

三、编写启动类并开启仪表盘

1 @SpringBootApplication
2 @EnableHystrixDashboard
3 public class DashBoardApp {
4     public static void main(String[] args) {
5         SpringApplication.run(DashBoardApp.class,args);
6     }
7 }

四、在服务的提供者下添加依赖

1         <!--hystrix 熔断器-->
2         <dependency>
3             <groupId>org.springframework.cloud</groupId>
4             <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
5         </dependency>

五、（选）在服务的提供者controller中的方法上面添加注解@HystrixCommand用于触发熔断机制后处理，并添加在触发熔断后进行处理的方法

 1     @RequestMapping("/aaaa")
 2     //@HystrixCommand(defaultFallback = "defaultFallBack")
 3     @HystrixCommand(fallbackMethod = "getUserByIdFallBack")
 4     public String getUserById(Integer id) throws Exception {
 5         ..........
 6     }
 7 
 8     public String defaultFallBack(){
 9        //触发了默认的熔断机制后开始处理
10     }
11 　　 //返回类型、参数要保持一致
12     public String getUserByIdFallBack(Integer id){
13        //触发了熔断机制，处理...
14     }

六、在服务的提供者启动类添加配置

 1 @SpringBootApplication
 2 @EnableEurekaClient
 3 @EnableCircuitBreaker// 开启熔断器的支持
 4 //@EnableHystrixDashboard// 开启熔断器仪表盘的支持
 5 public class HystrixApp {
 6     public static void main(String[] args) {
 7         SpringApplication.run(HystrixApp.class,args);
 8     }
 9 
10     @Bean
11     public ServletRegistrationBean getServlet(){
12         HystrixMetricsStreamServlet streamServlet=new HystrixMetricsStreamServlet();
13         ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
14 
15         registrationBean.setLoadOnStartup(1);
16         registrationBean.addUrlMappings("/hystrix.stream");
17         registrationBean.setName("HystrixMetricsStreamServlet");
18 
19         return registrationBean;
20     }
21 }