使用Feign怎么实现多文件上传功能

本篇文章为大家展示了使用Feign怎么实现多文件上传功能，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

想用Feign实现多文件的批量上传 Controller实现如下代码：

@PostMapping(value = "/uploadBatch/ali", consumes = MediaType.MULTIPART_FORM_DATA_VALUE, headers = "content-type=multipart/form-data")        @ApiOperation(value = "阿里云批量上传文件")        @ResponseBody        public Response uploadBatchAli(                        @RequestPart("files") MultipartFile[] files,                        @RequestParam("path") String path) {                return fileServiceClient.uploadBatchAli(files, path);        }

FeignClient代码如下

@PostMapping(value = File_Service_API_PREFIX + "/uploadBatch/ali", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE}, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)        Response uploadBatchAli(                        @RequestPart("files") MultipartFile[] files,                        @RequestParam("path") String path);

Feign调用服务，传送类似MultipartFile[] files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[] files，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

public class SpringMultipartEncoder extends SpringFormEncoder {        public SpringMultipartEncoder(Encoder delegate) {                super(delegate);                MultipartFormContentProcessor processor = (MultipartFormContentProcessor) getContentProcessor(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);        }}

然后配置类如下：

@Configurationpublic class MultipartSupportConfig {    @Autowired    private ObjectFactory messageConverters;    @Bean    public Encoder feignFormEncoder() {        return new SpringMultipartEncoder(new SpringEncoder(messageConverters));    }

然后FeignClient指定一下调用类

@FeignClient(name = "xxx",                configuration = MultipartSupportConfig.class)public interface FileServiceClient {@PostMapping(value = File_Service_API_PREFIX + "/uploadBatch/ali", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE}, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)        Response uploadBatchAli(                        @RequestPart("files") MultipartFile[] files,                        @RequestParam("path") String path);                    }

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