一、环境搭建
基于上一张的工程，我们再复制一份，去掉git文件夹，修改pom.xml的工程名，重新导入到idea。
新建module->feign,引入feign的依赖
发现，feign的依赖不可用，这是我们发现spring-boot2.1.0.RELEASE,spring-cloud的版本是Greenwich.M1。openfeign依赖的版本不支持。所以要么降springcloud版本，要么就重新配置依赖。我们选择重新配置依赖。
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>com.example</groupId>
<artifactId>feign</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>feign</name>
<description>Demo project for Spring Boot</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<openfeign.version>2.0.0.M1</openfeign.version>
<feign.version>9.5.1</feign.version>
<spring-boot.version>2.1.0.RELEASE</spring-boot.version>
<spring-cloud.version>Greenwich.M1</spring-cloud.version>
</properties>
<!--springboot版本2.1.0-->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
<!--springcloud 版本-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter</artifactId>
</dependency>
<!--open feign-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-openfeign-core</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-core</artifactId>
<version>${feign.version}</version>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-slf4j</artifactId>
<version>${feign.version}</version>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-hystrix</artifactId>
<version>${feign.version}</version>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-java8</artifactId>
<version>${feign.version}</version>
</dependency>
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form-spring</artifactId>
<version>3.2.2</version>
</dependency>
<!--feign-->
<!--<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
</dependency>-->
<!--<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
</dependency>-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!-- <dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-openfeign</artifactId>
<version>${openfeign.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>-->
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>
启动两个客户端
编译好之后，进入target目录，
java -jar client*.jar --spring.profiles.active=dev
或者java -jar client-0.0.1-SNAPSHOT.jar --server.port=8093
java -jar client-0.0.1-SNAPSHOT.jar --server.port=8091
二、代码
服务器名称为server1，客户端名为eureka-client，feign客户端名为feign-client
feign重要的代码是接口配置
package com.mhm.feignInterface;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
/**
* Created by MHm on 2018/11/19.
*/
@FeignClient(value = "eureka-client")
public interface FeignService {
@RequestMapping(value="/eureka",method = RequestMethod.GET)
String index(@RequestParam(value = "name") String name);
}
其中，FeignClient就是我们eureka-client的名称，index为各个客户端实现的方法。
Feign的restful接口如下：
package com.mhm.controller;
import com.mhm.feignInterface.FeignService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
/**
* Created by MHm on 2018/11/19.
*/
@RestController
public class FeignControler {
@Autowired
private FeignService feignService;
@RequestMapping(value = "/eureka",method = RequestMethod.GET)
public String index(@RequestParam String name){
return feignService.index(name);
}
}
三、运行
调用/eureka接口的时候，负载到了两个不同的客户端上面。
四、Github
创建git仓库
选择路径
之后代码文件都是红色
git添加
选择commit和push
代码共享到github
提交