分布式组件:Spring Cloud —— OpenFeign远程服务调用

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

package com.atguigu.gulimall.member.feign;
import com.atguigu.common.utils.R;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
/**
 * 这是一个声明式的远程调用
 */
@FeignClient("gulimall-coupon") //Member服务要调用Coupon服务
@Component
public interface CouponFeignService {
    @RequestMapping("/coupon/coupon/member/list")
    public R membercoupons();
}

package com.atguigu.gulimall.member;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
/**
 * 1、想要远程调用别的服务
 * 1）、引入open-feign
 * 2）、编写一个接口，告诉SpringCloud这个接口需要调用远程服务
 *   1、声明接口的每一个方法都是调用哪个远程服务的那个请求
 * 3）、开启远程调用功能
 */
@EnableFeignClients(basePackages = "com.atguigu.gulimall.member.feign")
@EnableDiscoveryClient
@SpringBootApplication
public class GulimallMemberApplication {
    public static void main(String[] args) {
        SpringApplication.run(GulimallMemberApplication.class, args);
    }
}

@RestController
@RequestMapping("member/member")
public class MemberController {
    @Autowired
    CouponFeignService couponFeignService;
    @RequestMapping("/coupons") //调用远程接口
    public R test(){
        MemberEntity memberEntity = new MemberEntity();
        memberEntity.setNickname("张三");
        R membercoupons = couponFeignService.membercoupons();
        return R.ok().put("member",memberEntity).put("coupons",membercoupons.get("coupons"));
    }
}