Dropwizard 文件上传

Question

我必须从我的网站上传一个文件，但 cnt 似乎可以使其与放置向导一起使用。

这是我网站上的表格。

   <form enctype="multipart/form-data" method="POST" action="UploadFile">
     <input type="file" id="fileUpload" name="file"/>
     <input type="hidden" id="fileName" name="fileName"/>
     <input type="submit" value="Upload"/>
   </form>

我如何在后端接收文件？

解决方案是

    @POST
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    public Response uploadFile(
        @FormDataParam("file") final InputStream fileInputStream,
        @FormDataParam("file") final FormDataContentDisposition contentDispositionHeader) {


    String filePath = uploadLocation + newFileName;
    saveFile(fileInputStream, filePath);
    String output = "File can be downloaded from the following location : " + filePath;

    return Response.status(200).entity(output).build();

}

private void saveFile(InputStream uploadedInputStream,
        String serverLocation) {
    try {
            OutputStream outputStream = new FileOutputStream(new      File(serverLocation));
            int read = 0;
            byte[] bytes = new byte[1024];

            outputStream = new FileOutputStream(new File(serverLocation));
            while ((read = uploadedInputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, read);
            }
            outputStream.flush();
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }   

Answer 1

您可以使用 nio 以更少的行数将内容保存到服务器

java.nio.file.Path outputPath = FileSystems.getDefault().getPath(<upload-folder-on-server>, fileName);
Files.copy(fileInputStream, outputPath);

此外，如果您使用 0.7.0-rc2，您的 pom.xml 中将需要此依赖项

<dependency>
<groupId>com.sun.jersey.contribs</groupId>
<artifactId>jersey-multipart</artifactId>
<version>1.18</version>
</dependency>