Feign搭建

Maven依赖

• springboot版本:2.0.2.RELEASE
• springcloud版本:Finchley.BUILD-SNAPSHOT

 <dependency>
    <groupId>org.springframework.cloudgroupId>
    <artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>
dependency>
<dependency>
    <groupId>org.springframework.cloudgroupId>
    <artifactId>spring-cloud-starter-openfeignartifactId>
dependency>
<dependency>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-webartifactId>
dependency>

项目架构(服务提供方)

eureka集群搭建:https://blog.csdn.net/qq_33594101/article/details/80422876

EurekaApplication.java

package zzq.eureka;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@EnableEurekaServer
@SpringBootApplication
@RestController
public class EurekaApplication{

    @Value("${server.port}")
    private int port;

    @RequestMapping("hello")
    public String hello(){
        return "eureka-server:"+port;
    }

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

}

application.yml

spring:
  application:
    name: eureka-server
  profiles:
    active: server1,server2,server3

项目架构(远程服务调用方)

FeignBeanFactoryPostProcessor.java

package zzq.feign.config;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.stereotype.Component;

import java.util.Arrays;

@Component
public class FeignBeanFactoryPostProcessor implements BeanFactoryPostProcessor {

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        if (containsBeanDefinition(beanFactory, "feignContext", "eurekaAutoServiceRegistration")) {
            BeanDefinition bd = beanFactory.getBeanDefinition("feignContext");
            bd.setDependsOn("eurekaAutoServiceRegistration");
        }
    }

    private boolean containsBeanDefinition(ConfigurableListableBeanFactory beanFactory, String... beans) {
        return Arrays.stream(beans).allMatch(b -> beanFactory.containsBeanDefinition(b));
    }
}

HelloService.java

package zzq.feign.service;

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

/**
 *远程服务调用
 **/
@FeignClient("eureka-server")//服务名称
public interface HelloService {

    @RequestMapping("hello")//映射路径
    String hello();

}

FeignApplication.java

package zzq.feign;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import zzq.feign.service.HelloService;

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
@RestController
public class FeignApplication {

    @Autowired
    private HelloService hs;

    @Value("${server.port}")
    private int port;

    @RequestMapping("hello")
    public String hello(){
        return hs.hello()+"/nWeb:"+port;
    }

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

application.yml

server:
  port: 8801
spring:
 application:
  name: fegin
eureka:
 client:
  service-url:
   defaultZone: http://server1:8764/eureka/,http://server2:8762/eureka/,http://server3:8763/eureka/

运行结果

源码地址:https://github.com/18770911080/Springboot-Architecture