OpenFeign天然支持负载均衡
想要去消费接口的API的服务引入pom依赖
<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
主启动类上加注解 @EnableFeignClients
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class MainOpenFeign80 {public static void main(String[] args) {SpringApplication.run(MainOpenFeign80.class, args);}
}
提供API的公共类也引入pom依赖
<!--openfeign-->
<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
在提供的API接口上加上
@FeignClient(value = "cloud-payment-service")注解
package com.atguigu.cloud.apis;import com.atguigu.cloud.entities.PayDTO;
import com.atguigu.cloud.resp.ResultData;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;/*** @author FGQ* @date 2024-03-31 13:13* @description**/
@FeignClient(value = "cloud-payment-service")
public interface PayFeignApi
{/*** 新增一条支付相关流水记录* @param payDTO* @return*/@PostMapping("/pay/add")public ResultData addPay(@RequestBody PayDTO payDTO);/*** 按照主键记录查询支付流水信息* @param id* @return*/@GetMapping("/pay/get/{id}")public ResultData getPayInfo(@PathVariable("id") Integer id);/*** openfeign天然支持负载均衡演示* @return*/@GetMapping(value = "/pay/get/info")public String mylb();
}
使用
package com.atguigu.cloud.controller;import com.atguigu.cloud.apis.PayFeignApi;
import com.atguigu.cloud.entities.PayDTO;
import com.atguigu.cloud.resp.ResultData;
import jakarta.annotation.Resource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;/*** @author FGQ* @date 2024-03-24 15:47* @description**/
@RestController
public class OrderController {@Resourceprivate PayFeignApi payFeignApi;@PostMapping("/feign/pay/add")public ResultData addOrder(@RequestBody PayDTO payDTO){System.out.println("第一步：模拟本地addOrder新增订单成功(省略sql操作)，第二步：再开启addPay支付微服务远程调用");ResultData resultData = payFeignApi.addPay(payDTO);return resultData;}@GetMapping("/feign/pay/get/{id}")public ResultData getPayInfo(@PathVariable("id") Integer id){System.out.println("-------支付微服务远程调用，按照id查询订单支付流水信息");ResultData resultData = payFeignApi.getPayInfo(id);return resultData;}/*** openfeign天然支持负载均衡演示** @return*/@GetMapping(value = "/feign/pay/mylb")public String mylb(){return payFeignApi.mylb();}}
