我有以下 JAVA Controller :

    @RequestMapping(value = "/data/upload", method = RequestMethod.POST)
    public
    @ResponseBody
    void uploadData(@RequestParam("file") MultipartFile file) throws IOException {
        logger.info("Received File for Ingestion");
        dataUploadService.processData(file.getInputStream());
    }

Node 服务器端代码:

serviceCall(serviceCallRequestData, request, finalResponse) {
        logger.info('Making remote request: ' + JSON.stringify(serviceCallRequestData));

        let file = request.files['file']; // file: Object {name: "sample_aspect_review_upload.csv", encoding: "7bit", mimetype: "text/csv", mv: }
        let formData = new FormData();
        formData.append('file', Buffer.from(file.data));

        fetch(serviceCallRequestData.url, {
            method: serviceCallRequestData.requestObject.method,
            headers: serviceCallRequestData.requestObject.headers,
            body: formData
        }).then(response => {
            if (response.status !== 200) {
                logger.error(`Error while making http call requestData: ${JSON.stringify(serviceCallRequestData)}`);
                finalResponse.status(500).send('Internal server error');
                return;
            }

            return response.json();
        }).then((json) => {
            logger.info(`Returning response for aspect-review-file-upload: ${JSON.stringify(json)}`);
            finalResponse.status(200).send(JSON.stringify(json));
        }).catch((e) => {
            logger.error(`Error while making http call requestData: ${JSON.stringify(serviceCallRequestData)} error: ${JSON.stringify(e)}`);
            finalResponse.status(500).send('Internal server error');
        });
    }

尝试上传 csv 文件，例如:

"product_id","review_id","aspect_id","rating","confidence_score","indices"
"pid","rid","aid",1,0.851955,"[{\"s\":0,\"e\":114,\"highlights\":[39,68]}]"

从 POSTMAN 轻松上传。请看下面的截图:

在 JAVA 中出现错误:收到未知异常 org.springframework.web.bind.MissingServletRequestParameterException:所需的 MultipartFile 参数"file"不存在 当我没有从 React 传递 contentType header 时。

在 JAVA 中出现错误:org.apache.commons.fileupload.FileUploadException:请求被拒绝，因为没有找到多部分边界，当我将 React 中的 contentType header 作为“Content-Type”传递时: '多部分/表单数据'

JAVA dropwizard Controller 的相同 Node 服务器端代码如下:

    @POST
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    @Produces(MediaType.APPLICATION_JSON)
    public Response uploadFile(
            @FormDataParam("file") InputStream inputStream,
            @FormDataParam("file") FormDataContentDisposition fileDetail
    ) throws IOException {
        logger.debug("Request to upload data file-name: {}", fileDetail.getName());

        dataUploadService.processData(inputStream);
        return Response.ok().build();
    } 

工作正常。

我做错了什么？

最佳答案

从 postman 的 curl 中可以看到如下命令:

curl -i -X POST -H "Content-Type:multipart/form-data" -F "file=@\"/pathto/sample.csv\";type=text/csv;filename=\"sample.csv\"" 'http://localhost:8080/data/upload'

所以我尝试在表单数据中添加 type=text/csv;filename=\"sample.csv\" 所以这应该工作:

    let file = request.files['file'];
    let formData = new FormData();
    formData.append("file", Buffer.from(file.data), {
        filename: file.name,
        contentType: file.mimetype,
    });

    fetch(serviceCallRequestData.url, {
        method: serviceCallRequestData.requestObject.method,
        headers: serviceCallRequestData.requestObject.headers,
        body: formData
    }).then(response => {
        if (response.status !== 200) {}
    });

关于java - 从 React/Node 上传 MultipartFile 的问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50506158/