1.添加依赖

<dependency>
   <groupId>org.springframework.cloudgroupId>
   <artifactId>spring-cloud-starter-openfeignartifactId>
dependency>
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2.在启动类中添加@EnableFeignClients注解

package com.xiaoyu;

import com.alibaba.cloud.nacos.loadbalancer.ConditionalOnLoadBalancerNacos;
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.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@MapperScan("com.xiaoyu.mapper")
@EnableDiscoveryClient
@EnableFeignClients
public class OrderApplication {
    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }
    @Bean//添加nacos客户端Bean
    @LoadBalanced//负载均衡注解
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

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3.创建调用接口

package com.xiaoyu.service;

import com.xiaoyu.entity.Product;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

@FeignClient("service-product")
public interface ProductService {
    @GetMapping("/product/{pid}")
    Product getById(@PathVariable("pid") Long pid);
}

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4.Controller中调用接口中的方法

package com.xiaoyu.controller;

import com.alibaba.cloud.nacos.loadbalancer.ConditionalOnLoadBalancerNacos;
import com.xiaoyu.entity.Order;
import com.xiaoyu.entity.Product;
import com.xiaoyu.service.OrderService;
import com.xiaoyu.service.ProductService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
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.net.URI;
import java.util.List;
import java.util.Random;

@Slf4j
@RestController
@RequestMapping("/order")
public class OrderController {
    @Autowired
    private ProductService productService;
    @GetMapping("/prod/{pid}")
    public Order order(@PathVariable("pid") Long pid) {
//        -----------这里是Feign----------
        Product product = productService.getById(pid);
        log.info("product = " + product);
        Order order = Order.builder().uid(1L).username("张三").pid(product.getId()).pname(product.getName()).price(product.getPrice()).number(1).build();
//        orderService.save(order);
        return order;
    }
}

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在浏览器输入http:localhost:8073/order/prod/pid就可以访问到service-product中的数据了