?? ??? ?<dependency>
? ? ? ? ? ? <groupId>io.github.openfeign.form</groupId>
? ? ? ? ? ? <artifactId>feign-form</artifactId>
? ? ? ? ? ? <version>3.3.0</version>
? ? ? ? </dependency>
? ? ? ? <dependency>
? ? ? ? ? ? <groupId>io.github.openfeign.form</groupId>
? ? ? ? ? ? <artifactId>feign-form-spring</artifactId>
? ? ? ? ? ? <version>3.3.0</version>
? ? ? ? </dependency>

加入配置類

@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客戶端進(jìn)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 {
?? ?//上傳文件
?? ?@RequestMapping(value = "/rmi/fileService/mediaImgUpload", ?produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
?? ?public String mediaImgUpload(@RequestPart MultipartFile file);
?? ?//下載文件
?? ?@RequestMapping(value = "/rmi/fileService/mediaDownload",method = RequestMethod.GET,consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
?? ?public Response mediaDownload(@RequestParam(required = true) String mediaId);

feign傳參MultipartFile問題解決

首先，feign服務(wù)之間的調(diào)用，傳參默認(rèn)的格式為：ContentType=application/x-www-form-urlencoded

以表單的形式傳參的，而文件流的傳參，需要form-data的ContentType，否則會報錯的

首先引入依賴

 <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form</artifactId>
            <version>3.8.0</version>
        </dependency>
 
        <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form-spring</artifactId>
            <version>3.8.0</version>
        </dependency>

注意spring boot版本是2.x以上的，上面兩個依賴的版本不低于3.5.0，否則還是無效的

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 : 解決feign傳遞流數(shù)據(jù)的異常
 * @createTime ：2020/6/14
 */
@Configuration
public class FeignSupportConfig {
 
    @Autowired
    private ObjectFactory<HttpMessageConverters> 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調(diào)用  todo feign使用get有坑啊,是否考慮使用HttpClient替換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查詢圖片信息
     * @param id
     * @return
     */
    @GetMapping("/web/picture/{id}")
    Result<TFileDO> get(@PathVariable("id") Long id); 
 
    /**
     * id批量查詢圖片信息
     * @param idList
     * @return
     */
    @PostMapping("/web/picture/getByIdList")
    Result<List<TFile>> getByIdList(@RequestBody List<Long> idList); 
 
    /**
     * 文件上傳
     * @param file
     * @return
     */
    @PostMapping(value = "/web/picture/uploadFile",produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
     Result<String> uploadFile(@RequestPart("file") MultipartFile file); 
}