@MultipartForm 如何获取原始文件名? [英] @MultipartForm How to get the original file name?

问题描述

我正在使用 jboss 的 rest-easy 多部分提供程序来导入文件.我在这里阅读 http://docs.jboss.org/resteasy/docs/1.0.0.GA/userguide/html/Content_Marshalling_Providers.html#multipartform_annotation 关于@MultipartForm 因为我可以将它与我的 POJO 精确映射.

I am using jboss's rest-easy multipart provider for importing a file. I read here http://docs.jboss.org/resteasy/docs/1.0.0.GA/userguide/html/Content_Marshalling_Providers.html#multipartform_annotation regarding @MultipartForm because I can exactly map it with my POJO.

下面是我的POJO

public class SoftwarePackageForm {

    @FormParam("softwarePackage")
    private File file;

    private String contentDisposition;

    public File getFile() {
        return file;
    }

    public void setFile(File file) {
        this.file = file;
    }

    public String getContentDisposition() {
        return contentDisposition;
    }

    public void setContentDisposition(String contentDisposition) {
        this.contentDisposition = contentDisposition;
    }
}

然后我得到了文件对象并打印了它的绝对路径，它返回了一个类型为 file 的文件名.扩展名和上传的文件名丢失.我的客户正在尝试上传存档文件 (zip,tar,z)

Then I got the file object and printed its absolute path and it returned a file name of type file. The extension and uploaded file name are lost. My client is trying to upload a archive file(zip,tar,z)

我在服务器端需要此信息，以便我可以正确应用取消归档程序.

I need this information at the server side so that I can apply the un-archive program properly.

原始文件名在 content-disposition 标头中发送到服务器.

The original file name is sent to the server in content-disposition header.

我如何获得这些信息?或者至少我怎么能说 jboss 用上传的文件名和扩展名保存文件?它可以从我的应用程序配置吗?

How can I get this information? Or atleast how can I say jboss to save the file with the uploaded file name and extension? Is it configurable from my application?

推荐答案

在查看了一些 Resteasy 示例后，包括这个 one，当使用带有 @MultipartForm注释.

After looking around a bit for Resteasy examples including this one, it seems like there is no way to retrieve the original filename and extension information when using a POJO class with the @MultipartForm annotation.

到目前为止，我所看到的示例通过 HTTP POST 从提交的多部分表单数据的文件"部分中检索 Content-Disposition 标头中的文件名，本质上类似于:

The examples I have seen so far retrieve the filename from the Content-Disposition header from the "file" part of the submitted multiparts form data via HTTP POST, which essentially, looks something like:

Content-Disposition: form-data; name="file"; filename="your_file.zip"
Content-Type: application/zip

您必须更新您的文件上传 REST 服务类才能像这样提取此标头:

You will have to update your file upload REST service class to extract this header like this:

@POST
@Path("/upload")
@Consumes("multipart/form-data")
public Response uploadFile(MultipartFormDataInput input) {

  String fileName = "";
  Map<String, List<InputPart>> formParts = input.getFormDataMap();

  List<InputPart> inPart = formParts.get("file"); // "file" should match the name attribute of your HTML file input 
  for (InputPart inputPart : inPart) {
    try {
      // Retrieve headers, read the Content-Disposition header to obtain the original name of the file
      MultivaluedMap<String, String> headers = inputPart.getHeaders();
      String[] contentDispositionHeader = headers.getFirst("Content-Disposition").split(";");
      for (String name : contentDispositionHeader) {
        if ((name.trim().startsWith("filename"))) {
          String[] tmp = name.split("=");
          fileName = tmp[1].trim().replaceAll(""","");          
        }
      }

      // Handle the body of that part with an InputStream
      InputStream istream = inputPart.getBody(InputStream.class,null);

      /* ..etc.. */
      } 
    catch (IOException e) {
      e.printStackTrace();
    }
  }

  String msgOutput = "Successfully uploaded file " + filename;
  return Response.status(200).entity(msgOutput).build();
}

希望这会有所帮助.

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