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springcloud之使用feign消费服务并且使用hystrix进行熔断
服务消费(新建一个feign工程并且使用hystrix)
项目截图
配置文件
pom.xml文件
<?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">
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
<relativePath/>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>xiejx.cn</groupId>
<artifactId>eureka-consumer-feign-hystrix</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- 负载均衡-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
<version>2.0.1.RELEASE</version>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
</project>
application.yml
spring:
application:
name: eureka-consumer
server:
port: 3001
#server.port=${random.int[10000,19999]}
eureka:
client:
serviceUrl:
defaultZone: http://localhost:1001/eureka
logging:
file: ./logs/${spring.application.name}.log
feign:
hystrix:
enabled: true
配置文件需要注意的就是需要打开feign.hystrix.enable的配置并且springboot2.0以上需要手动依赖netflix-hystrix
代码
启动的主类
package jfun;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.client.SpringCloudApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
/**
* @Author MIV
* @Date 2019/4/15
*/
@SpringBootApplication
@EnableDiscoveryClient
@EnableCircuitBreaker
@EnableFeignClients
public class FeignHystrixApp {
public static void main(String[] args) {
new SpringApplicationBuilder(FeignHystrixApp.class).web(true).run(args);
}
}
服务接口
package jfun;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
/**
* @Author Miv
* @Date 2019/4/15
*/
@FeignClient(name = "eureka-client", fallback = DcClientFailBack.class)
public interface DcClient {
@HystrixCommand
@GetMapping("/dc")
String consumer();
}
熔断实现
package jfun;
import org.springframework.stereotype.Component;
/**
* @Author Miv
* @Date 2019/4/15
*/
@Component
public class DcClientFailBack implements DcClient {
@Override
public String consumer() {
System.out.println("熔断，默认回调函数");
return "熔断，默认回调函数";
}
}
服务层
package jfun;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
* @Author Miv
* @Date 2019/4/15
*/
@Service
public class DcService {
@Autowired
DcClient dcClient;
public String dc() {
return dcClient.consumer();
}
}
控制器
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package jfun;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
/**
* @Author Miv
* @Date 2019/4/15
*/
@RestController
public class DcController {
@Autowired
DcService dcService;
@GetMapping("/consumer")
public String dc() {
return dcService.dc();
}
}
监控
配置文件
pom.xml
<?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>
<groupId>xiejx.cn</groupId>
<artifactId>hystrix-dashboard</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-parent</artifactId>
<version>Dalston.SR1</version>
<relativePath />
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
</dependencies>
</project>
application.yml
spring:
application:
name: hystrix-dashboard
server:
port: 4000
代码
package jfun;
import org.springframework.boot.SpringApplication;
import org.springframework.cloud.client.SpringCloudApplication;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
/**
* @Author Miv
* @Date 2019/4/15
*/
@EnableHystrixDashboard
@SpringCloudApplication
public class HystrixDashboardApp {
public static void main(String[] args) {
System.out.println("======================访问管理hystrix======================");
System.out.println("http://localhost:4000/hystrix");
System.out.println("监控feign:http://localhost:3001/hystrix.stream");
System.out.println("======================访问管理hystrix======================");
SpringApplication.run(HystrixDashboardApp.class, args);
}
}
操作和验证
启动服务
- 启动eureka-server服务（服务发现）
- 启动eureka-client（注册服务）
- 启动eureka-consumer-feign-hystrix（服务消费）
- 启动hystrix-dashboard（服务监控）
请求http://localhost:3001/consumer进行服务消费，可以看到服务正常消费
然后关闭eureka-client，可以看到服务正常熔断，符合预期。
监控服务
进入http://localhost:4000/hystrix查看监控面板
输入需要监控的服务，点击Monitor Stream进行监控
如果此页面加载不出来，可以重新访问http://localhost:3001/consumer，然后再一次请求页面