[开发测试]Feign实现多文件上传，Open Feign多文件上传解决方案

如何使用Feign实现多文件上传，Open Feign多文件上传解决方案
废话不多说，直接上代码

用feign多文件上传的Controller代码如下

@Slf4j
@RestController
@RequestMapping("/store")
@Api(description = "店铺管理接口", tags = "店铺管理接口")
public class StoreController {
    @Autowired
    private StoreService storeService;
    
    @ApiOperation(value = "新增店铺信息")
    @PostMapping(value = "/addStoreInfo")
    public Result<Store> addStoreInfo(@Valid @ApiParam(value = "添加店铺时的店铺") StoreDto storeDto, MultipartFile[] multipartFiles) {
        return storeService.addStoreInfo(storeDto,multipartFiles);
    }
}

FeignClient代码如下

/**
 * FileName: FileService
 * Author:   SixJR.
 * Date:     2022/3/2 18:38:56
 * Description: 文件RPC服务接口
 * History:
 * <author>          <time>          <version>          <desc>
 */
@FeignClient(name = FeignServiceNameConstants.FILE_SERVICE, fallbackFactory = FileServiceFallbackFactory.class, decode404 = true)
public interface FileService {

    @PostMapping(value = "/enclosure/upload/{objectName}/{objectId}", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE}, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    Result upload(@PathVariable("objectName")String objectName, @PathVariable("objectId")String objectId,@RequestPart("multipartFiles") MultipartFile[] multipartFiles);

}

Feign调用服务，传送类似MultipartFile[] multipartFiles多文件的时候，会出现如下错误Could not write request: no suitable HttpMessageConverter found for request type [[Lorg.springframework.web.multipart.MultipartFile;] and content type [multipart/form-data]"

错误是因为Feign在组装MultipartFile[] multipartFiles多文件的时候出现了问题，解决这个问题可以重写SpringFormEncoder这个类，重写后的代码如下：

import feign.form.ContentType;
import feign.form.MultipartFormContentProcessor;
import feign.form.spring.SpringFormEncoder;
import feign.RequestTemplate;
import feign.codec.EncodeException;
import feign.codec.Encoder;
import feign.form.spring.SpringManyMultipartFilesWriter;
import feign.form.spring.SpringSingleMultipartFileWriter;
import org.springframework.web.multipart.MultipartFile;

import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Map;

/**
 * FileName: SpringMultipartEncoder
 * Author:   SixJR.
 * Date:     2022/3/2 19:54:12
 * Description: Feign实现多文件上传，重写SpringFormEncoder
 * History:
 * <author>          <time>          <version>          <desc>
 */
public class SpringMultipartEncoder extends SpringFormEncoder {
    public SpringMultipartEncoder(Encoder delegate) {
        super(delegate);
        MultipartFormContentProcessor processor = (MultipartFormContentProcessor) getContentProcessor(ContentType.MULTIPART);
        processor.addWriter(new SpringSingleMultipartFileWriter());
        processor.addWriter(new SpringManyMultipartFilesWriter());
    }

    @Override
    public void encode(Object object, Type bodyType, RequestTemplate template) throws EncodeException {
        if (bodyType != null && bodyType.equals(MultipartFile[].class)) {
            MultipartFile[] file = (MultipartFile[]) object;
            if(file != null) {
                Map data = Collections.singletonMap(file.length == 0 ? "" : file[0].getName(), object);
                super.encode(data, MAP_STRING_WILDCARD, template);
                return;
            }
        }
        super.encode(object, bodyType, template);
    }
}

配置类如下

package com.chinared.common.config;

import com.chinared.common.utils.SpringMultipartEncoder;
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 feign.codec.Encoder;
import org.springframework.context.annotation.Configuration;

/**
 * FileName: MultipartSupportConfig
 * Author:   SixJR.
 * Date:     2022/3/2 19:56:43
 * Description: 解决Feign在组装MultipartFile[]的时候出现的问题
 * History:
 * <author>          <time>          <version>          <desc>
 */

@Configuration
public class MultipartSupportConfig {
    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;

    @Bean
    public Encoder feignFormEncoder() {
        return new SpringMultipartEncoder(new SpringEncoder(messageConverters));
    }
}

最后在FeignClient指定一下调用类就好啦~

package com.chinared.common.feign;

import com.chinared.common.config.MultipartSupportConfig;
import com.chinared.common.constant.FeignServiceNameConstants;
import com.chinared.common.feign.fallback.FileServiceFallbackFactory;
import com.chinared.common.model.Result;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

/**
 * FileName: FileService
 * Author:   SixJR.
 * Date:     2022/3/2 18:38:56
 * Description: 文件RPC服务接口
 * History:
 * <author>          <time>          <version>          <desc>
 */
@FeignClient(name = FeignServiceNameConstants.FILE_SERVICE, fallbackFactory = FileServiceFallbackFactory.class, decode404 = true,configuration = MultipartSupportConfig.class)
public interface FileService {

    @PostMapping(value = "/enclosure/upload/{objectName}/{objectId}", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE}, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    Result upload(@PathVariable("objectName")String objectName, @PathVariable("objectId")String objectId,@RequestPart("multipartFiles") MultipartFile[] multipartFiles);

}

好啦，本篇关于OpenFeign支持多文件上传的解决方案就到这啦~