Spring Cloud（七）Feign实战（ribbon负载均衡）_feign+ribbon实战

前期准备

1、创建一个Eureka Server工程，项目名称：eureka-server

2、创建一个Eureka Client 服务提供者 工程，项目名称：eureka-client1

工程eureka-server和eureka-client1 创建请参考

Spring Cloud（三）Eureka实战

1、启动Eureka 服务提供者、Eureka注册中心

启动eureka-server、eureka-client1

PS：eureka-client1 在idea中通过多实例启动

查看 Eureka 控制台

2、创建并启动Feign服务消费者

项目名称：service-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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.yi</groupId>
    <artifactId>serice-feign</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>serice-feign</name>
    <description>serice-feign</description>

    <parent>
        <groupId>com.yi</groupId>
        <artifactId>finchley</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <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>
    </dependencies>

</project>

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eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
server:
  port: 8765
spring:
  application:
    name: service-feign
feign:
  hystrix:
    enabled: true

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package com.yi.sericefeign;

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

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
@EnableFeignClients
public class SericeFeignApplication {

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

}

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@EnableFeignClients：开启Feign的功能

@FeignClient(value = "service-client",fallback = HelloWorldServiceImpl.class)
public interface HelloWorldService {

    @RequestMapping(value = "/hello", method = RequestMethod.GET)
    String helloWorld(@RequestParam(value = "name") String name);
}
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@ FeignClient（“服务名”）：指定调用哪个服务，通过服务名称

@RestController
public class HelloWorldController {

    @Autowired
    HelloWorldService helloWorldService;

    @GetMapping(value = "/helloWorld")
    public String helloWorld(@RequestParam String name) {
        System.out.println("...............service-feign");
        return helloWorldService.helloWorld(name);
    }
}
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访问：http://localhost:8765/helloWorld?name=yi

轮询出现，与前章节ribbon一致

hello yi ，port is 8762
hello yi ，port is 8763
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git项目源码：https://github.com/yilei111/-Spring-Cloud-Finchley