如何在Play框架中上传文件？

Question

I am new to play framework 2.0 and wanted to upload a file in my local file system. But I have no idea how to start this.can anyone help me here?

Answer 1

Our Form

@form(action = routes.Application.upload, 'enctype -> "multipart/form-data") {
    <input type="file" name="picture">
    <p>
        <input type="submit">
    </p>
}

Our Upload action

@BodyParser.Of(value = BodyParser.Text.class, maxLength = 10 * 1024)
public static Result upload() {
  MultipartFormData body = request().body().asMultipartFormData();
  FilePart picture = body.getFile("picture");
  if (picture != null) {
    String fileName = picture.getFilename();
    String contentType = picture.getContentType(); 
    File file = picture.getFile();
    return ok("File uploaded");
  } else {
    flash("error", "Missing file");
    return redirect(routes.Application.index());    
  }
}

Just change the maxLength = 10 * 1024 (this is just around 10kb) to your desired length more of this can be found on the documentation

if you are gonna send the files via Ajax. use this

public static Result upload() {
  File file = request().body().asRaw().asFile();
  return ok("File uploaded");
}

The response from above will be encoded as Mutlipart/form-data but will just contain the plain content files