Spring cloud uses feign consumer service and uses hystrix to fuse
Service consumption (create a feign project and use hystrix)
Project screenshots
configuration file
pom.xml file
<?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>
<!-- load balancing-->
<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
It should be noted that the configuration file feign.hystrix.enable needs to be opened and the configuration of spring boot 2.0 and above needs to rely on netflix-hystrix manually
Code
Main class started
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);
}
}
Service interface
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();
}
Fusing realization
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("Fuse, default callback function");
return "Fuse, default callback function";
}
}
Service layer
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();
}
}
Controller
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();
}
}
Monitor
configuration file
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
Code
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("======================Access management hystrix======================");
System.out.println("http://localhost:4000/hystrix");
System.out.println("Monitor feign:http://localhost:3001/hystrix.stream");
System.out.println("======================Access management hystrix======================");
SpringApplication.run(HystrixDashboardApp.class, args);
}
}
Operation and verification
Startup service
- Start the Eureka server service (service discovery)
- Start Eureka client (Registration Service)
- Launch Eureka consumer feign hystrix (service consumption)
- Start hystrix dashboard (service monitoring)
Request http://localhost:3001/consumer for service consumption. You can see the normal service consumption
Then close the Eureka client, and you can see that the service is normal and meets the expectation.
Monitoring service
Go to http://localhost:4000/hystrix to view the monitoring panel
Enter the service to be monitored and click Monitor Stream to monitor
If this page cannot be loaded, you can visit http://localhost:3001/consumer again, and then request the page again