Spring cloud declarative feign client calling tool

isWulongbo 2021-01-22 10:12:29
spring cloud declarative feign client


springcloud Support two kinds of client calling tools :

  1. RestTemplate, Basically don't use
  2. Feign, The interface is annotated , High readability

notes : Originally intended to continue to use consul As a registry for Feign The client calls ,provide The configuration is as follows , But I can't call it all the time Registered service name , We have to switch to Eureka To use , If you know the reason, please advise !

## Service port number
port: 8501
## Service alias -- Service registered to consul name
name: consul-member
## Registry Center consul Address
host: localhost
port: 8500
service-name: ${spring.application.name} # Service provider name
# ## consul ip Address
# hostname:

Eureka Feign Client calls

Here we are based on SpringCloud Integration Eureka High availability cluster Project .
provide We don't need to make any changes , Only need consumer order The module adds the following dependencies :

<!--springcloud Integrate openfeign-->

feign Call interface

MemberApiFeign.java: @FeignClient Appoint provide Service alias , Interface copy Call :

package com.baba.wlb.api.feign;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
* @Author wulongbo
* @Date 2021/1/21 19:17
* @Version 1.0
@FeignClient(name = "app-member")
public interface MemberApiFeign {
// Feign Write in springMVC Interface form writing
// @FeignClient Call service interface name Is the service name
String getMember();

Control page

AppFeignController.java: Inject Feign Interface

package com.baba.wlb.api.controller;
import com.baba.wlb.api.feign.MemberApiFeign;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
* @Author wulongbo
* @Date 2021/1/21 19:21
* @Version 1.0
public class AppFeignController {
private MemberApiFeign memberApiFeign;
public String getFeignOrder() {
return memberApiFeign.getMember();

Start class

AppOrder Start class : add to @EnableFeignClients Turn on Feign Client permissions

package com.baba.wlb;
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;
* @Author wulongbo
* @Date 2021/1/9 15:39
* @Version 1.0
public class AppOrder {
public static void main(String[] args) {
SpringApplication.run(AppOrder.class, args);
// The second way If you use rest Method is called by alias ribbon Load Balancer
// The second way @LoadBalanced Can let restTemplate The template has the ability of client load balancing when requested
// solve RestTemplate No reason found , hold RestTemplate Sign up to Springboot In the container @Bean
// The first way
// @Bean
// RestTemplate restTemplate(){
// return new RestTemplate();
// }
// The second way @LoadBalanced Can let restTemplate The template has the ability of client load balancing when requested
// @Bean
// @LoadBalanced
// RestTemplate restTemplate() {
// return new RestTemplate();
// }
// @EnableFeignClients Turn on Feign Client permissions

notes : The startup class should be placed correctly

start-up Eureka Server service , start-up member provide service , start-up order consumer Visit after service :http://localhost:8200/getFeignOrder



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