feign服务调用，hystrix熔断器，actuator应用监控

朴灿烈づ我的快乐病毒、 2021-11-05 04:24 354阅读 0赞

一：feign是springCloud跨服务调用的组件，feign底层也是一个基于http的封装

我现在创建两个服务，一个消费者，一个生产者：

pom：

<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>

创建一个生产者：

server:
      port: 8020
    spring:
      application:
        name: producer
    
    eureka:
      client:
        healthcheck:
          enabled: true #健康检查
        serviceUrl.defaultZone: http://localhost:8010/eureka/
      instance:
        instance-id: ${spring.cloud.client.ip-address}:${server.port}
        prefer-ip-address: true
        lease-expiration-duration-in-seconds: 10 # 发呆时间，即服务续约到期时间（缺省为90s）
        lease-renewal-interval-in-seconds: 5 # 心跳时间，即服务续约间隔时间（缺省为30s）
        metadata-map:
          cluster: service
    
    feign:
      hystrix:
        enabled: true

创建一个http接口：

package com.example.producer.controller;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /**
     * @Auther: gongyiyang
     * @Date: 2018/10/22 12:47
     * @Description:
     */
    @RestController
    @RequestMapping("/producer")
    public class HelloController {
    
        @GetMapping("/hello")
        public String hello() {
            return "你好，这是producer";
        }
    }

创建一个消费者：

server:
      port: 8021
    spring:
      application:
        name: consumer
      
    
    eureka:
      client:
        healthcheck:
          enabled: true
        serviceUrl.defaultZone: http://localhost:8010/eureka/
      instance:
        #实例显示格式，默认按照ip，名称，端口
        instance-id: ${spring.cloud.client.ip-address}:${server.port}
        prefer-ip-address: true
        # 发呆时间，即服务续约到期时间（缺省为90s）
        lease-expiration-duration-in-seconds: 10
        # 心跳时间，即服务续约间隔时间（缺省为30s）
        lease-renewal-interval-in-seconds: 5
        metadata-map:
          cluster: service
    
    feign:
      hystrix:
        enabled: true

接口开发：

package com.example.consumer.controller;
    
    import com.example.consumer.servise.HelloService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /**
     * @author PC_gongyiyang
     * @Auther: gongyiyang
     * @Date: 2018/10/22 15:47
     * @Description:
     */
    @RestController
    @RequestMapping("/consumer")
    public class FeignHelloController {
    
        @Autowired
        private HelloService helloService;
    
        @GetMapping("/hello")
        public String hello() {
            return helloService.hello();
        }
    }

调用生产者接口：

package com.example.consumer.servise;
    
    import com.example.consumer.servise.fallback.HelloServiceBack;
    import org.springframework.cloud.openfeign.FeignClient;
    import org.springframework.web.bind.annotation.GetMapping;
    
    /**
     * @author PC_gongyiyang
     * @Auther: gongyiyang
     * @Date: 2018/10/22 15:44
     * @Description:
     */
    @FeignClient(name = "producer",fallback = HelloServiceBack.class)
    public interface HelloService {
    
        @GetMapping("/producer/hello")
        String hello();
    }

设置一个异常回调：

package com.example.consumer.servise.fallback;
    
    import com.example.consumer.servise.HelloService;
    import org.springframework.stereotype.Component;
    
    /**
     * @author PC_gongyiyang
     * @Auther: gongyiyang
     * @Date: 2018/10/22 16:00
     * @Description:
     */
    @Component
    public class HelloServiceBack implements HelloService {
        @Override
        public String hello() {
            return "这是consumer的fallback";
        }
    }

调用结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzIxMTg0NDcx_size_16_color_FFFFFF_t_70][]

简单的配置服务间的调用就完成了！

二：hystrix熔断器：

在应用启动时配置熔断器地址：

package com.example.consumer;
    
    import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.web.servlet.ServletRegistrationBean;
    import org.springframework.cloud.client.SpringCloudApplication;
    import org.springframework.cloud.netflix.hystrix.EnableHystrix;
    import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
    import org.springframework.cloud.openfeign.EnableFeignClients;
    import org.springframework.context.annotation.Bean;
    
    /**
     * @author PC_gongyiyang
     * @Auther: gongyiyang
     * @Date: 2018/10/22 14:02
     * @Description:
     */
    @EnableHystrix
    @EnableHystrixDashboard
    @EnableFeignClients
    @SpringCloudApplication
    public class ConsumerApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(ConsumerApplication.class, args);
        }
    
        @SuppressWarnings("Duplicates")
        @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;
        }
    }

访问熔断器地址;

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzIxMTg0NDcx_size_16_color_FFFFFF_t_70 1][]

可以看到熔断器正在工作：

三：actuator应用监控：

为actuator创建一个应用：

pom：

<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-netflix-eureka-client</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-turbine</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
            </dependency>

配置信息：

server:
      port: 8030
    spring:
      application:
        name: turbine
    
    eureka:
      client:
        healthcheck:
          enabled: true
        serviceUrl.defaultZone: http://localhost:8010/eureka/
      instance:
        instance-id: ${spring.cloud.client.ip-address}:${server.port}
        prefer-ip-address: true
        lease-expiration-duration-in-seconds: 10 # 发呆时间，即服务续约到期时间（缺省为90s）
        lease-renewal-interval-in-seconds: 5 # 心跳时间，即服务续约间隔时间（缺省为30s）
    turbine:
      app-config: consumer,producer,zuul #需要监控的服务名
      aggregator:
        cluster-config: service,zuul #需要监控的服务集群名，default
      cluster-name-expression: metadata['cluster'] #new String("default")
      combine-host-port: true
      instanceUrlSuffix:
        service: hystrix.stream    ##key为clusterConfig的集群名字，默认为default
        zuul: hystrix.stream    ##value为集群的hystrix监控url后缀，springboot2.0默认为actuator/hystrix.stream

启动日志可以看到有哪些熔断地址：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzIxMTg0NDcx_size_16_color_FFFFFF_t_70 2][]

访问以下监控页面：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzIxMTg0NDcx_size_16_color_FFFFFF_t_70 3][]

看一下应用监控详情：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzIxMTg0NDcx_size_16_color_FFFFFF_t_70 4][]

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![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzIxMTg0NDcx_size_16_color_FFFFFF_t_70 5][]

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