基于feign传参MultipartFile问题解决

目录

• feign传参MultipartFile问题
• 首先引入依赖
• 新建feign的配置
• 在feign接口中配置
• Feign传输MultipartFile的一些问题
• File转MultipartFile

feign传参MultipartFile问题

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);
 
}

注意加上这个，表示传参格式：

就可以传参了的

Feign传输 MultipartFile的一些问题

File转MultipartFile

pom.xml

org.springframework
spring-mock
2.0.8

public static MultipartFile getMultipartFile(String fileName, File file) throws IOException {
    return new MockMultipartFile(fileName, file.getName(), ContentType.APPLICATION_OCTET_STREAM.toString(), new FileInputStream(file));
}

报错 Current request is not a multipart request、Content type ‘’ not supported

@PostMapping设置 consumes = MediaType.MULTIPART_FORM_DATA_VALUE

使用@RequestPart()，不能使用@RequestParam()

@PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
ResultBody upload(@RequestPart(value = "file") MultipartFile file);

报错 Required request part ‘file’ is not present

configuration

@Configuration
public class UploadFeignConfig {
    @Bean
    public Encoder multipartFormEncoder() {
        return new SpringFormEncoder(new SpringEncoder(new ObjectFactory() {
            @Override
            public HttpMessageConverters getObject() throws BeansException {
                return new HttpMessageConverters(new RestTemplate().getMessageConverters());
            }
        }));
    }
}

FeignClient

@FeignClient(value = FileConstants.FILE_SERVER, configuration= UploadFeignConfig.class)
public interface FileServiceClient extends IFileServiceClient {
    @Override
    @PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    ResultBody upload(@RequestPart(value = "file") MultipartFile file);
}

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。