创建一个新的消费者模块并导入依赖

<?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">
    <parent>
        <artifactId>springcloud</artifactId>
        <groupId>com.kuang</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>springcloud-consumer-dept-feign</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <!--  消费者：实体类+web  不需要连接数据库，跟前端打交道的  -->
    <dependencies>

        <!-- Ribbon 集成      -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>
        <!-- Ribbon 集成      -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-ribbon</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>

        <!--    Eureka    -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>com.kuang</groupId>
            <artifactId>springcloud-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <!--    web 支持    -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--     热部署   -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

    </dependencies>




</project>

修改API模块里的

实体类

package com.kuang.springcloud.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;

import java.io.Serializable;
@NoArgsConstructor
@Accessors(chain = true)//链式写法
@Data
//实现序列化  实体类  ORM映射  mysql--dept
public class Dept implements Serializable {

    private Long deptno;//主键
    private String dname;
    //这个数据库存在哪个数据库字段。~微服务，一个服务对应一个数据库，同一个信息可能存在不同的数据库
    private String db_source;

    public Dept(String dname) {
        this.dname = dname;
    }

    /**
     * 链式写法：
     *Dept dept = new Dept();
     * dept.setDeptNo(11).setDbane('sss').setDb_source("001");
     */



}

 业务层接口，Feign基于接口实现的

package com.kuang.springcloud.service;

import com.kuang.springcloud.pojo.Dept;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;

import java.util.List;

@Component
@FeignClient(value = "SPRINGCLOUD-PROVIDER-DEPT")
public interface DeptClientService {

    @GetMapping("/dept/get/{id}")
    Dept queryById(@PathVariable("id") Long id);

    @GetMapping("/dept/list")
    List<Dept> queryAll();

    @PostMapping("/dept/add")
    String addDept(Dept dept);



}

消费者Feign服务

Controller

package com.kuang.springcloud.controller;

import com.kuang.springcloud.pojo.Dept;
import com.kuang.springcloud.service.DeptClientService;
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 org.springframework.web.client.RestTemplate;

import java.util.List;

@RestController
public class DeptConsumerController {

    //理解：消费者，不应该有Service层
    //模板有很多方法供我们去使用

    //注入过来
//(String url, 实体：map, Class<T> responseType, Object... uriVariables)
//(url,实体,map,Class<T> responseType 返回值类型)  三个参数  五种请求方式

//Ribbon 我们这里的地址，应该是一个变量，通过服务名字来访问
   // private static final String REST_URL_PREFIX="http://localhost:8001";

    @Autowired
    private DeptClientService service;

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


    @RequestMapping("/consumer/dept/add")
    public String add(Dept dept){
        return service.addDept(dept);
    }


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


}

主启动类加两个注解

package com.kuang.springcloud;

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

//Ribbon和Eureka 整合以后 ，客户端可以直接调用，不用关心IP地址和端口号~
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients(basePackages = "com.kuang.springcloud")

public class FeignDeptConsumer80 {
    public static void main(String[] args) {
        SpringApplication.run(FeignDeptConsumer80.class,args);
    }
}

 

多封装了一层而已！

本质就是Ribbon