本项目会使用之前的Eureka注册中心、会员微服务(两个集群)、新建点名微服务，去调用会员服务中的会员信息。fegin会自动实现负载均衡

启动后看注册中心如下图

image.png

项目代码:
链接:https://pan.baidu.com/s/1XUJeXQw1dTWJ9FQ2O7m9Og 密码:mb2w

一、新建springboot2项目工程

项目结构如下

image.png

二、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>con.joychen</groupId>
    <artifactId>fegin</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>fegin</name>
    <description>fegindianming</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
    </properties>

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

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


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

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

三、项目配制

image.png

spring:
  application:
    name: dianming-server
  cloud:
    config:
      discovery:
        enabled: true
        serviceId: dianming-server
server:
  port: 8990
eureka:
  instance:
    hostname: localhost
    instance-id: ${spring.application.name}:${spring.cloud.client.hostname}:${server.port}
    prefer-ip-address: false
  client:
    service-url:
      defaultZone: http://localhost:7878/eureka/

四、写Fegin接口

image.png

package con.joychen.fegin.service;

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

import java.util.List;

@FeignClient(value = "manber-server")   //这里是注册在注册中心微服务名称
public interface FeginMenber {

    @RequestMapping("/member")      //跟据名称调用member接口会自动调用
    public List<String> getMenberAll();
}

五、写控制类调用Fegin接口

image.png

package con.joychen.fegin.controllers;

import con.joychen.fegin.service.FeginMenber;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class DianMingController {
    @Autowired
    private FeginMenber feginMenber;

    @RequestMapping("/dianmingMenber")
    public List<String> getMenber(){
        System.out.println("Fegin-convent-manber-server");
        return feginMenber.getMenberAll();
    }
}

六、启动类配制

image.png

package con.joychen.fegin;

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.cloud.openfeign.FeignClient;

@SpringBootApplication
@EnableEurekaClient    //启动注册中心客户端
@EnableFeignClients    //启动Fegin
public class FeginApplication {

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

七、启动测试 自动实现了负载均衡

请求接口: http://localhost:8990/dianmingMenber
第一次调用测试结果

image.png

第二次调用测试结果

image.png