java - 文件正在使用 Content-Disposition header 保存

Question

我有 angular2 前端和 Dropwizard 后端。我正在尝试从前端上传图片到后端。

我的html代码:

<input type="file" name="file" (change)="fileChange($event)">

我的组件:

fileChange(event) {
    let fileList: FileList = event.target.files;
    if (fileList.length > 0) {
        let file: File = fileList[0];
        let formData:FormData = new FormData();
        formData.append('file', file);
        this.siteDescriptionService.sendPhoto(formData).subscribe(value => {
            console.log("value", value);
        });
    }
}

我的服务:

sendPhoto(data): Observable<any> {
    return this.http.postPhoto('api/site/savePhoto', data, null).map(res => res);
}

我的http拦截器:

postPhoto(url: string, params?: any, options?: RequestOptionsArgs): Observable<any> {
    this.beforeRequest();
    let headers = new Headers();
    headers.append('Content-Type', 'multipart/form-data');
    let reqOptions = new RequestOptions({ headers: headers });
    return super.post(this.getFullUrl(url), params, reqOptions)
        .catch(this.onCatch)
        .do((res: Response) => {
            this.onSuccess(res);
        }, (error: any) => {
            this.onError(error);
        })
        .finally(() => {
            this.onFinally();
        });
}

请求正在使用这样的有效负载发送:

------WebKitFormBoundaryAz4AnN4lFPWKUvmH内容处置:表单数据；名称="file"；文件名=“标志.png”内容类型:图像/png

------WebKitFormBoundaryAz4AnN4lFPWKUvmH--

在我的服务器上我有:

@POST
@Timed
@Path("savePhoto")
@Consumes(MediaType.MULTIPART_FORM_DATA)
@Produces(MediaType.APPLICATION_JSON)
public Response uploadFile(InputStream uploadedInputStream) throws IOException {
    String uploadedFileLocation = "/tmp/photo1.png";


    FormDataMultiPart part = new FormDataMultiPart().field("file", uploadedInputStream, MediaType.TEXT_PLAIN_TYPE);

    FormDataBodyPart p = part.getField("file");
    InputStream i = (InputStream) p.getEntity();

    writeToFile( i, uploadedFileLocation);

    String output = "File uploaded to : " + uploadedFileLocation;
    return Response.ok(output).build();
}

private void writeToFile(InputStream uploadedInputStream, String uploadedFileLocation)
        throws IOException {
    int read;
    final int BUFFER_LENGTH = 1024;
    final byte[] buffer = new byte[BUFFER_LENGTH];
    OutputStream out = new FileOutputStream(new File(uploadedFileLocation));
    while ((read = uploadedInputStream.read(buffer)) != -1) {
        out.write(buffer, 0, read);
    }
    out.flush();
    out.close();
}

一切都很好，文件正在保存，但它是与整个请求负载一起保存的，包括 Content-Disposition、Content-Type header 等，因此文件变得“损坏”。

如何从文件中删除 Content-Disposition header ？

Answer 1

当您使用InputStream参数时，您是在说您想要整个请求正文。如果您只想要单个部件，则需要使用 @FormDataParam 以及部件名称对其进行注释

public Response uploadFile(@FormDataParam("file") InputStream file,
                           @FormDataParam("file") FormDataContentDisposition fdcd) {
    String filename = fcdc.getFileName();

    // You don't need to create the FormDataMultiPart
    // just save the InputStream parameter
}

为了使其正常工作，您还需要注册MutliPartFeature

env.jersey().register(MultiPartFeature.class);