OpenFeign 作用是可远程调用其他服务

    1. 在父 pom 中引入 spring cloud 依赖

      1.  <dependencyManagement>               
      2.              <dependencies>
      3.                      <!--spring cloud 依赖-->
      4.          <dependency>
      5.              <groupId>org.springframework.cloud</groupId>
      6.              <artifactId>spring-cloud-dependencies</artifactId>
      7.              <version>${spring-cloud.version}</version>
      8.              <type>pom</type>
      9.              <scope>import</scope>
      10.          </dependency>
      11.      </dependencies>
      12.  </dependencyManagement>

    2. 在公共模块的 pom.xml中引入 spring cloud 的 OpenFeign 依赖

      1. <!--使模块可通过HTTP进行远程调用其他服务-->
      2. <dependency>
      3.  <groupId>org.springframework.cloud</groupId>
      4.  <artifactId>spring-cloud-starter-openfeign</artifactId>
      5. </dependency>

    3.添加 @EnableFeignClients 注释

    1. @SpringBootApplication
    2. @EnableFeignClients
    3. public class Application {
    5.     public static void main(String[] args) {
    6.         SpringApplication.run(Application.class, args);
    7.     }
    9. }

    4.创建 client 目录，里面放需要调用的服务的接口

    1. // VodClient.java
    2. package com.catmmao.edu.client;
    4. import com.catmmao.utils.data.response.CommonResponse;
    5. import org.springframework.cloud.openfeign.FeignClient;
    6. import org.springframework.http.ResponseEntity;
    7. import org.springframework.web.bind.annotation.DeleteMapping;
    8. import org.springframework.web.bind.annotation.PathVariable;
    10. /**
    11.  * 阿里视频点播服务
    12.  *
    13.  * @author catmmao
    14.  * @since 2021/9/4 下午5:42
    15.  */
    16. @FeignClient("edu-vod")
    17. public interface VodClient {
    19.     /**
    20.      * 删除视频
    21.      *
    22.      * @param id 阿里云生成的视频ID
    23.      */
    24.     @DeleteMapping(value = "/vod/{id}")
    25.     ResponseEntity<CommonResponse<?>> deleteVideo(@PathVariable String id);
    26. }