SpringCloud feign搭建

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/gcxzflgl/article/details/82925953

本章节基于SpringCloud Ribbon负载均衡配置案例搭建feign工程

前面用到的Ribbon+RestTemplate进行调用，feign是基于接口+注解的方式（SpringCloud 深入理解feign之源码解析）

步骤一：创建feign maven module 端口 80

<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>
	<parent>
		<groupId>com.gcxzflgl.spring</groupId>
		<artifactId>springCloud</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<artifactId>springCloud-consumer-dept-feign</artifactId>
	<dependencies>
		<dependency><!-- 自己定义的api -->
			<groupId>com.gcxzflgl.spring</groupId>
			<artifactId>springCloud-api</artifactId>
			<version>${project.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-feign</artifactId>
		</dependency>
		<!-- Ribbon相关 -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-ribbon</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- 修改后立即生效，热部署 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>springloaded</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
		</dependency>
	</dependencies>


</project>

步骤二：在resources下创建application.yml

server:
  port: 80

eureka:
  client:
    register-with-eureka: false
    service-url: 
      defaultZone: http://eureka7001:7001/eureka/,http://eureka7002:7002/eureka/,http://eureka7003:7003/eureka/  

步骤三:修改springCloud-api工程依赖

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

步骤四：添加一个Service并且加上fegin提供的注解，说明哪个服务需要通过feign,重新mvn clean -> mvn install

package com.gcxzflgl.springCloud.service;

import java.util.List;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.gcxzflgl.springCloud.entity.Dept;


@FeignClient(value = "MICROSERVICECLOUD-DEPT")
public interface DeptClientService
{
	@RequestMapping(value = "/dept/get/{id}", method = RequestMethod.GET)
	public Dept get(@PathVariable("id") long id);

	@RequestMapping(value = "/dept/list", method = RequestMethod.GET)
	public List<Dept> list();

	@RequestMapping(value = "/dept/add", method = RequestMethod.POST)
	public boolean add(Dept dept);
}

步骤五：编写Controller类，调用公共模块Service

package com.gcxzflgl.springcloud.controller;

import java.util.List;

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

import com.gcxzflgl.springCloud.entity.Dept;
import com.gcxzflgl.springCloud.service.DeptClientService;

@RestController
public class DeptController_Consumer
{
	@Autowired
	private DeptClientService service;

	@RequestMapping(value = "/consumer/dept/get/{id}")
	public Dept get(@PathVariable("id") Long id)
	{
		return this.service.get(id);
	}

	@RequestMapping(value = "/consumer/dept/list")
	public List<Dept> list()
	{
		return this.service.list();
	}

	@RequestMapping(value = "/consumer/dept/add")
	public Object add(Dept dept)
	{
		return this.service.add(dept);
	}
}

步骤六：启动主类开启注解，测试运行

package com.gcxzflgl.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients(basePackages= {"com.gcxzflgl.springcloud"})
@ComponentScan("com.gcxzflgl.springcloud")
public class DeptConsumer80_Feign_App
{
	public static void main(String[] args)
	{
		SpringApplication.run(DeptConsumer80_Feign_App.class, args);
	}
}

看到这个页面feign已经搭建完毕，更多feign描述

请见Feign的源码地址：https://github.com/OpenFeign/feign

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