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SpringCloud之Feign遠程接口映射的實現(xiàn)

更新時間：2020年09月08日 08:31:58 作者：奶茶37.2℃

這篇文章主要介紹了SpringCloud之Feign遠程接口映射的實現(xiàn)，文中通過示例代碼介紹的非常詳細，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

一.簡介

SpringCloud是基于Restful的遠程調(diào)用框架，引入Ribbon負載均衡組件后還需要客戶端使用RestTemplate調(diào)用遠程接口，操作起來還顯得繁瑣。SpringCloud提供了遠程接口映射，將遠程Restful服務(wù)映射為遠程接口，消費端注入遠程接口即可實現(xiàn)方法調(diào)用。

二.流程

1.新建遠程接口映射模塊service-api，并引入Feign接口映射依賴

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

2.編寫接口映射接口

package com.vincent.service;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient("SERVICE-USER")
@RequestMapping("/service-user")
public interface IUserService {
  @GetMapping("/detail")
  Object detail(@RequestParam("id") Integer id);
}

3.配置消費端application.yml

server:
 port: 9001

eureka:
 client:
  service-url:
   defaultZone: http://localhost:7001/service-eureka/eureka
  register-with-eureka: false

4.消費端添加映射模塊依賴

 <dependency>
  <groupId>com.vincent</groupId>
  <artifactId>service-api</artifactId>
  <version>1.0-SNAPSHOT</version>
</dependency>

5.客戶端注入需要使用的服務(wù)接口映射

package com.vincent.controller;

import com.vincent.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class UserController {

  @Autowired
  private IUserService userService;

  @GetMapping("/detail")
  public Object detail(Integer id){
    return this.userService.detail(id);
  }
}

5.編寫消費端啟動類

package com.vincent;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;


@SpringBootApplication
@EnableFeignClients({"com.vincent.service"})
@EnableEurekaClient
public class ConsumerApp {
  public static void main(String[] args) {
    SpringApplication.run(ConsumerApp.class,args);
  }
}

@EnableFeignClients 定義Feign接口映射掃描包，IOC容器會自動創(chuàng)建接口實現(xiàn)類

6.訪問 http://localhost:9001/detail?id=1