spring cloud open-feign eureka demo

最新推荐文章于 2025-03-27 10:15:00 发布

置顶 Mintสดใส

最新推荐文章于 2025-03-27 10:15:00 发布

阅读量427

点赞数 2

分类专栏： eureka open-feign

本文链接：https://blog.youkuaiyun.com/ruanjianchenming/article/details/105207749

版权

eureka 同时被 2 个专栏收录

1 篇文章

订阅专栏

open-feign

1 篇文章

订阅专栏

本文详细介绍了一个基于Feign的微服务通信实例，包括服务提供者、消费者和Eureka注册中心的搭建。通过具体代码展示了如何实现服务间的GET和POST请求，以及手动客户端的调用方式。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

一个服务提供者一个消费者一个注册中心

1.注册中心

@SpringBootApplication
@EnableEurekaServer
public class FeignEurekaApplication {

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

配置文件：

server:
port: 8500
spring:
application:
name: feign-eureka
eureka:
instance:
hostname: localhost
preferIpAddress: true
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

工程结构：

2.一个服务提供者

@RestController
@SpringBootApplication
@EnableDiscoveryClient
public class FeignProviderApplication {

@GetMapping("/getPrint")
public String getPrint(@RequestParam("content") String content) {
return "获取到的消息".concat(content);
}

@PostMapping("/postPrint")
public String postPrint(@RequestParam("content") String content) {
return "postPrint 消息接收".concat(content);
}

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

配置文件：

server:
port: 9000
spring:
application:
name: feign-provider
eureka:
instance:
hostname: localhost
client:
serviceUrl:
defaultZone: http://localhost:8500/eureka/
工程结构：

3.一个消费者

openfeign客户端调用：

@FeignClient("feign-provider")
public interface PrintService {

   /**
   * 默认使用@RequestBody get请求需要显示的注明@RequestParam
   * @param content
   * @return
   */
@PostMapping(value = "/postPrint")
String postPrint(@RequestParam("content") String content);

@GetMapping(value = "/getPrint")
String getPrint(@RequestParam("content")String content);
}

openfeigin 手工客户端调用：

ConsumerImpl.java

package com.github.Mint.consumer.service;

import javax.annotation.Resource;

import org.springframework.cloud.openfeign.FeignClientsConfiguration;
import org.springframework.cloud.openfeign.support.SpringMvcContract;
import org.springframework.context.annotation.Import;
import org.springframework.stereotype.Component;

import feign.Client;
import feign.Contract;
import feign.Feign;
import feign.codec.Decoder;
import feign.codec.Encoder;

@Component
@Import(FeignClientsConfiguration.class)
public class ConsumerImpl implements IConsum{

   @Resource
   private Client client;

   @Resource
   private Decoder decode;

   @Resource
   private Encoder encoder;

   @Resource
   private Contract contract;

   @Override
   public String postPrint(String content) {
       IConsumer consum = Feign.builder().client(client).decoder(decode).encoder(encoder).contract(contract).target(IConsumer.class,"http://feign-provider");
       return consum.postPrint(content);
   }

   @Override
   public String getPrint(String content) {
       IConsumer consum = Feign.builder().client(client).decoder(decode).encoder(encoder).contract(contract).target(IConsumer.class,"http://feign-provider");
       return consum.getPrint(content);
   }
}

IConsum.java

public interface IConsum {
   /**
   * 模拟post请求
   * @param content
   * @return
   */
   String postPrint(String content);

   /**
   * 模拟get请求
   * @param content
   * @return
   */
   String getPrint(String content);
}
IConsumer.java

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

public interface IConsumer {

   @PostMapping("/postPrint")
   String postPrint(@RequestParam("content") String content);

   @GetMapping("/getPrint")
   String getPrint(@RequestParam("content")String content);
}
调用入口：

@RestController
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class FeignConsumerApplication {

@Autowired
private PrintService printService;

@Autowired
private IConsum iconsum;

@GetMapping("/getPrint")
public String getPrint(String content) {
System.out.println(iconsum.getPrint(content));
return printService.getPrint(content);
}

@GetMapping("/postPrint")
public String postPrint(String content) {
System.out.println(iconsum.getPrint(content));
return printService.postPrint(content);
}

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

工程结构：