使用feign传递参数类型为MultipartFile的问题

feign传递参数类型为MultipartFile

feign默认是不支持多媒体文件类型的文件传输的,但是可以通过引入第三方jar包解决这个问题,步骤可以分为三步。

引入maven依赖

        
            io.github.openfeign.form
            feign-form
            3.3.0
        
        
            io.github.openfeign.form
            feign-form-spring
            3.3.0
        

加入配置类

@Configuration
public class FeignMultipartSupportConfig {
 
    @Bean
    @Primary
    @Scope("prototype")
    public Encoder multipartFormEncoder() {
        return new SpringFormEncoder();
    }
 
    @Bean
    public feign.Logger.Level multipartLoggerLevel() {
        return feign.Logger.Level.FULL;
    }
}

在feign客户端进行配置

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.multipart.MultipartFile;
import config.FeignMultipartSupportConfig;
import feign.Response;
@FeignClient(value = "", fallback = FileServiceFallback.class,configuration=FeignMultipartSupportConfig.class)
public interface IFileService {
    //上传文件
    @RequestMapping(value = "/rmi/fileService/mediaImgUpload",  produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public String mediaImgUpload(@RequestPart MultipartFile file);
    //下载文件
    @RequestMapping(value = "/rmi/fileService/mediaDownload",method = RequestMethod.GET,consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public Response mediaDownload(@RequestParam(required = true) String mediaId);

feign传参MultipartFile问题解决

首先,feign服务之间的调用,传参默认的格式为:ContentType=application/x-www-form-urlencoded

以表单的形式传参的,而文件流的传参,需要form-data的ContentType,否则会报错的

首先引入依赖

 
            io.github.openfeign.form
            feign-form
            3.8.0
        
 
        
            io.github.openfeign.form
            feign-form-spring
            3.8.0
        

注意spring boot版本是2.x以上的,上面两个依赖的版本不低于3.5.0,否则还是无效的

新建feign的配置

package com.wm.blog_config.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; 
 
/**
 * @author :半卷流年
 * @description : 解决feign传递流数据的异常
 * @createTime :2020/6/14
 */
@Configuration
public class FeignSupportConfig {
 
    @Autowired
    private ObjectFactory messageConverters;
 
    @Bean
    public Encoder feignFormEncoder() {
        return new SpringFormEncoder(new SpringEncoder(messageConverters));
    } 
}

在feign接口中配置

package com.wm.blog_admin.feign; 
import com.wm.blog_admin.feign.factory.PictureClientFallbackFactory;
import com.wm.blog_common.constatnt.CommonConstant;
import com.wm.blog_common.domain.TFileDO;
import com.wm.blog_common.entity.TFile;
import com.wm.blog_common.req.TFileQuery;
import com.wm.blog_common.result.Result;
import com.wm.blog_config.config.CustomFeignConfig;
import com.wm.blog_config.config.FeignSupportConfig;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile; 
import java.util.List;
 
/***
 * @ClassName: PictureFeignClient
 * @Description: picture feign调用  todo feign使用get有坑啊,是否考虑使用HttpClient替换feign的HttpURLConnection,采用apache的HttpClient
 * @Author: wm_yu
 * @Create_time: 16:39 2020-3-26
 */
@FeignClient(value = CommonConstant.PICTURE_MODULE_NAME, configuration = {CustomFeignConfig.class, FeignSupportConfig.class}, fallbackFactory = PictureClientFallbackFactory.class)
public interface PictureFeignClient {
 
    /**
     * id查询图片信息
     * @param id
     * @return
     */
    @GetMapping("/web/picture/{id}")
    Result get(@PathVariable("id") Long id); 
 
    /**
     * id批量查询图片信息
     * @param idList
     * @return
     */
    @PostMapping("/web/picture/getByIdList")
    Result> getByIdList(@RequestBody List idList); 
 
    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping(value = "/web/picture/uploadFile",produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
     Result uploadFile(@RequestPart("file") MultipartFile file); 
}

使用feign传递参数类型为MultipartFile的问题_第1张图片

注意加上这个,表示传参格式:

使用feign传递参数类型为MultipartFile的问题_第2张图片

就可以传参了的

以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。

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