Play framework2 development (5)

File Upload

Upload files with multipart/form-data in a form

In a web application, the standard upload file is a form encoded with multipart/form-data, which allows mixed form data in the form of file attachments. Note that for the HTTP method of such a form, it must be submitted by POST

1. Open the routes file and add POST /upload controllers.UserControl.upload()

2. In UserControl.java, add

 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();
			 System.out.println("filename:"+filename+",contentType:"+contentType);
			 return ok("File load");
			 
		 }else{
			 flash("error","Miss file");
			 
			 return redirect(routes.Application.index()); 
		 }
	 }

3. Open form.scala.html and join

 <form action="/upload" method="post" enctype="multipart/form-data">
   <input type="file" name="picture">
    
    <p>
        <input type="submit">
    </p>
    
   </form>

Direct file upload

Another way to upload files is to use ajax to upload files asynchronously from a form. In this case, the requested body will not be encoded as Multipart/form-data, and only contains the content of the plain text file.

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