Feign实现多文件上传

原创
09/10 17:18
阅读数 194

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:

@Configuration
public class MultipartSupportConfig {

    @Autowired
    private ObjectFactory<HttpMessageConverters> 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);
		    
}

Ok,到此就算配置完成了。Feign完美支持多文件上传。

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