spring Cloud 使用feign进行文件MultipartFile是发生的错误

spring Cloud 使用feign进行文件MultipartFile的传递

出现错误的原因：

报错：

​ 在服务提供者报错：Current request is not a multipart request

然后查找相关资料
SpringCloud 组件fiegn默认是不支持传递文件的

但提供了 feign-form 拓展工具

解决方法：

步骤一：在消费者服务中加入相关依赖pom中

<!--解决SpringCloud 组件fiegn默认是不支持传递文件的-->
<dependency>
    <groupId>io.github.openfeign.form</groupId>
    <artifactId>feign-form-spring</artifactId>
    <version>3.6.0</version>
</dependency>
<dependency>
    <groupId>io.github.openfeign.form</groupId>
    <artifactId>feign-form</artifactId>
    <version>3.6.0</version>
</dependency>
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.3</version>
</dependency>

步骤二：编写一个配置类

package com.yep.config;

import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.cloud.openfeign.support.SpringEncoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.context.annotation.Scope;
/**
*   解决feign文件传递问题的配置类
*/
@Configuration
public class FeignMultipartSupportConfig {
    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;
   
    @Bean
    @Primary
    @Scope("prototype")
    public Encoder multipartFormEncoder() {
        return new SpringFormEncoder(new SpringEncoder(messageConverters));
    }
 
    @Bean
    public feign.Logger.Level multipartLoggerLevel() {
        return feign.Logger.Level.FULL;
    }
 }

步骤三：feign接口的编写

• 服务调用方加注解类（配置类）
• @RequestPart 来接收文件参数

package com.yep.feign;

import com.yep.config.FeignMultipartSupportConfig;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;

/**
 *  OSS存储模块，远程服务发现提供接口
 */
@FeignClient(value = "service-oss", // 对应的项目名
            configuration= FeignMultipartSupportConfig.class // 解决feign文件传递问题的配置类feign配置类)
            )
public interface ossFileFeign {

    /**
     *  文件上传到七牛云
     */
    @PostMapping(value = "/oss/file/upload" ,consumes = "multipart/form-data")  // "multipart/form-data"指定类型
    public String uploadImg(@RequestPart("file") MultipartFile img) throws IOException ;

}

步骤四：修改被调用的服务接收文件流

• @RequestPart 来接收文件参数

package com.yep.controller;

import com.yep.service.UploadService;
import org.springframework.web.bind.annotation.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;

/**
 *  七牛云oss
 */
@RestController
@RequestMapping("/oss/file")
public class FileApiController {

    @Autowired
    private UploadService uploadService;

    /**
     *  文件上传 到七牛云
     * @param img 要上传文件对象
     * @return
     * @throws IOException
     */
    @PostMapping("/upload")
    public String uploadImg(@RequestPart("file") MultipartFile img) throws IOException {
        System.out.println("我被调用了");
        String url = uploadService.uploadImg(img);
        return url;
    }

}

注意点：

注意：文件流要用RequestPart注解传参，其余参数用RequestParam注解传参