配置步骤

引入依赖

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

EnableFeignClients

package com.pl.gulimail.member;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@MapperScan("com.pl.gulimail.member.dao")
@EnableFeignClients(basePackages = "com.pl.gulimail.member.feign")
@EnableDiscoveryClient
@SpringBootApplication
public class GulimailMemberApplication {

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

}

FeignClient

@FeignClient("服务名")

package com.pl.gulimail.member.feign;

import com.pl.common.utils.R;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

/**
 * @Auther: pl
 * @Date: 2020/7/24 04:03
 * @Description:
 */
@FeignClient("gulimail-product")
public interface ProductFeignService {

    @GetMapping("product/brand/getAll")
    public R getAll();


}

要远程调用的product服务的接口

package com.pl.gulimail.product.controller;

import com.pl.common.utils.PageUtils;
import com.pl.common.utils.R;
import com.pl.gulimail.product.entity.BrandEntity;
import com.pl.gulimail.product.service.BrandService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.Arrays;
import java.util.Map;



/**
 * 品牌
 *
 * @author pl
 * @email xxxx@163.com
 * @date 2020-06-28 23:43:54
 */
@RestController
@RequestMapping("product/brand")
public class BrandController {
    @Autowired
    private BrandService brandService;

    @GetMapping("/getAll")
    public R getAll(){
        return R.ok().put("value",brandService.list());
    }

}

member的controller

package com.pl.gulimail.member.controller;

import java.util.Arrays;
import java.util.Map;


import com.pl.gulimail.member.feign.ProductFeignService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.pl.gulimail.member.entity.MemberEntity;
import com.pl.gulimail.member.service.MemberService;
import com.pl.common.utils.PageUtils;
import com.pl.common.utils.R;



/**
 * 会员
 *
 * @author pl
 * @email xxxx@163.com
 * @date 2020-07-03 18:13:32
 */
@RestController
@RequestMapping("member/member")
public class MemberController {

    @Autowired
    ProductFeignService productFeignService;

    @GetMapping("/test/getBrandAll")
    public R getBrandAll(){
        //注意product中已经封装数据到json的value中，这里为了避免出现value套value，再返回的json中直接获取value
        return R.ok().put("value",productFeignService.getAll().get("value"));
    }
}

postman

image.png