Springcloud学习(三)——Feign

<?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>
        <artifactId>springCloud-demo</artifactId>
        <groupId>com.badcat</groupId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../../pom.xml</relativePath>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.badcat</groupId>
    <artifactId>feign-consumer</artifactId>
    <packaging>jar</packaging>
    <name>feign-consumer</name>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>

</project>

spring.application.name=feign-consumer
server.port=40001

eureka.client.serviceUrl.defaultZone=http://localhost:20000/eureka/

# 每隔5秒钟，向服务注册中心发送一条续约指令
eureka.instance.lease-renewal-interval-in-seconds=5

# 如果30秒依然没有收到续约请求，判定服务过期
eureka.instance.lease-expiration-duration-in-seconds=30

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

/**
 * @author badcat
 * @date 2020-04-12 11:58
 */
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class FeignConsumerApplication {

    public static void main(String[] args) {
        SpringApplication.run(FeignConsumerApplication.class, args);
    }

}

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

/**
 * @author badcat
 * @date 2020-04-12 12:00
 */
@FeignClient("eureka-client")
public interface IService {

    /**
     * 此处指定调用eureka-client的哪个接口
     * @return
     */
    @GetMapping("/sayHi")
    String sayHi();

}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author badcat
 * @date 2020-04-12 12:03
 */
@RestController
public class Controller {

    @Autowired
    private IService iService;

    @GetMapping("/sayHi")
    public String sayHi(){
        return this.iService.sayHi();
    }

}

#针对eureka-client服务集群的负载均衡策略的配置
eureka-client.ribbon.NFLoadBalancerRuleClassName=com.netflix.loadbalancer.RandomRule

# 每台机器最大的重试次数
feign-client.ribbon.MaxAutoRetries=2

# 可以再重试几台机器
feign-client.ribbon.MaxAutoRetriesNextServer=2

# 连接超时时间，单位毫秒
feign-client.ribbon.ConnectTimeout=1000

# 业务处理超时，单位毫秒
feign-client.ribbon.ReadTimeout=2000

# 在所有HTTP Method进行重试，默认false
feign-client.ribbon.OkToRetryOnAllOperations=true