Unggah Berkas

When Django handles a file upload, the file data ends up placed in request.FILES (for more on the request object see the documentation for request and response objects). This document explains how files are stored on disk and in memory, and how to customize the default behavior.

Peringatan

Ada resiko keamanan jika anda menerima isi terunggah dari pengguna tidak dipercaya! Lihat topik panduan keamanan pada User-uploaded content untuk rincian pengurangan.

Unggah berkas dasar

Consider a form containing a FileField:

forms.py

from django import forms

class UploadFileForm(forms.Form):
    title = forms.CharField(max_length=50)
    file = forms.FileField()

A view handling this form will receive the file data in request.FILES, which is a dictionary containing a key for each FileField (or ImageField, or other FileField subclass) in the form. So the data from the above form would be accessible as request.FILES['file'].

Note that request.FILES will only contain data if the request method was POST, at least one file field was actually posted, and the <form> that posted the request has the attribute enctype="multipart/form-data". Otherwise, request.FILES will be empty.

Most of the time, you'll pass the file data from request into the form as described in Mengikat berkas terunggah ke formulir. This would look something like:

views.py

from django.http import HttpResponseRedirect
from django.shortcuts import render
from .forms import UploadFileForm

# Imaginary function to handle an uploaded file.
from somewhere import handle_uploaded_file

def upload_file(request):
    if request.method == 'POST':
        form = UploadFileForm(request.POST, request.FILES)
        if form.is_valid():
            handle_uploaded_file(request.FILES['file'])
            return HttpResponseRedirect('/success/url/')
    else:
        form = UploadFileForm()
    return render(request, 'upload.html', {'form': form})

Notice that we have to pass request.FILES into the form's constructor; this is how file data gets bound into a form.

Ini adalah cara umum anda mungkin menangani sebuah berkas terunggah:

def handle_uploaded_file(f):
    with open('some/file/name.txt', 'wb+') as destination:
        for chunk in f.chunks():
            destination.write(chunk)

Looping over UploadedFile.chunks() instead of using read() ensures that large files don't overwhelm your system's memory.

There are a few other methods and attributes available on UploadedFile objects; see UploadedFile for a complete reference.

Penanganan berkas terunggah dengan model

Jika anda sedang menyimpan sebuah berkas pada Model dengan FileField, menggunakan ModelForm memuat pengolahan ini lebih mudah. byek berkas akan disimpan ke tempat ditentukan oleh argumen upload_to dari FileField  sesuai ketika memanggil form.save():

from django.http import HttpResponseRedirect
from django.shortcuts import render
from .forms import ModelFormWithFileField

def upload_file(request):
    if request.method == 'POST':
        form = ModelFormWithFileField(request.POST, request.FILES)
        if form.is_valid():
            # file is saved
            form.save()
            return HttpResponseRedirect('/success/url/')
    else:
        form = ModelFormWithFileField()
    return render(request, 'upload.html', {'form': form})

If you are constructing an object manually, you can assign the file object from request.FILES to the file field in the model:

from django.http import HttpResponseRedirect
from django.shortcuts import render
from .forms import UploadFileForm
from .models import ModelWithFileField

def upload_file(request):
    if request.method == 'POST':
        form = UploadFileForm(request.POST, request.FILES)
        if form.is_valid():
            instance = ModelWithFileField(file_field=request.FILES['file'])
            instance.save()
            return HttpResponseRedirect('/success/url/')
    else:
        form = UploadFileForm()
    return render(request, 'upload.html', {'form': form})

Uploading multiple files

If you want to upload multiple files using one form field, set the multiple HTML attribute of field's widget:

forms.py

from django import forms

class FileFieldForm(forms.Form):
    file_field = forms.FileField(widget=forms.ClearableFileInput(attrs={'multiple': True}))

Then override the post method of your FormView subclass to handle multiple file uploads:

views.py

from django.views.generic.edit import FormView
from .forms import FileFieldForm

class FileFieldView(FormView):
    form_class = FileFieldForm
    template_name = 'upload.html'  # Replace with your template.
    success_url = '...'  # Replace with your URL or reverse().

    def post(self, request, *args, **kwargs):
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        files = request.FILES.getlist('file_field')
        if form.is_valid():
            for f in files:
                ...  # Do something with each file.
            return self.form_valid(form)
        else:
            return self.form_invalid(form)

Penanganan Unggah

When a user uploads a file, Django passes off the file data to an upload handler -- a small class that handles file data as it gets uploaded. Upload handlers are initially defined in the FILE_UPLOAD_HANDLERS setting, which defaults to:

["django.core.files.uploadhandler.MemoryFileUploadHandler",
 "django.core.files.uploadhandler.TemporaryFileUploadHandler"]

Together MemoryFileUploadHandler and TemporaryFileUploadHandler provide Django's default file upload behavior of reading small files into memory and large ones onto disk.

You can write custom handlers that customize how Django handles files. You could, for example, use custom handlers to enforce user-level quotas, compress data on the fly, render progress bars, and even send data to another storage location directly without storing it locally. See Menulis penangan unggah penyesuaian for details on how you can customize or completely replace upload behavior.

Dimana data terunggah disimpan

Sebelum anda menyimpan berkas terunggah, data butuh disimpan di suatu tempat.

By default, if an uploaded file is smaller than 2.5 megabytes, Django will hold the entire contents of the upload in memory. This means that saving the file involves only a read from memory and a write to disk and thus is very fast.

Bagaimanapun, jika sebuah berkas terunggah terlalu besar, Django akan menulis berkas terunggah ke berkas sementara disimpan di sistem direktori sementara. Pada serambi seperti-Unix ini berarti anda dapat mengharap Django membangkitkan sebuah berkas dipanggil seperti sesuatu /tmp/tmpzfp6I6.upload. Jika sebuah unggahan cukup besar, anda dapat melihat berkas ini tumbuh dalam ukuran seperti Django mengalirkan data ke cakram.

These specifics -- 2.5 megabytes; /tmp; etc. -- are "reasonable defaults" which can be customized as described in the next section.

Merubah perilaku penanganan unggah

Ada sedikit pengaturan yang mengendalikan perilaku unggah berkas Django. Lihat File Upload Settings 1 untuk rincian.

Merubah penanganan unggah dengan cepat

Sometimes particular views require different upload behavior. In these cases, you can override upload handlers on a per-request basis by modifying request.upload_handlers. By default, this list will contain the upload handlers given by FILE_UPLOAD_HANDLERS, but you can modify the list as you would any other list.

For instance, suppose you've written a ProgressBarUploadHandler that provides feedback on upload progress to some sort of AJAX widget. You'd add this handler to your upload handlers like this:

request.upload_handlers.insert(0, ProgressBarUploadHandler(request))

You'd probably want to use list.insert() in this case (instead of append()) because a progress bar handler would need to run before any other handlers. Remember, the upload handlers are processed in order.

If you want to replace the upload handlers completely, you can assign a new list:

request.upload_handlers = [ProgressBarUploadHandler(request)]

Catatan

You can only modify upload handlers before accessing request.POST or request.FILES -- it doesn't make sense to change upload handlers after upload handling has already started. If you try to modify request.upload_handlers after reading from request.POST or request.FILES Django will throw an error.

Dengan demikian, anda harus selalu merubah penanganan unggahan sedini mungkin dalam tampilan anda.

Juga, request.POST diakses oleh CsrfViewMiddleware yang diadakan secara awalan. Ini berarti anda akan butuh menggunakan csrf_exempt() pada tampilan anda untuk mengizinkan anda merubah penangan unggahan. Anda kemudian akan butuh menggunakan csrf_protect() pada fungsi yang sebenarnya mengolah permintaan. Catat bahwa ini berarti bahwa penangan mungkin mulai menerima berkas unggahan sebelum CSRF pemeriksaan telah diselesaikan. Kode contoh:

from django.views.decorators.csrf import csrf_exempt, csrf_protect

@csrf_exempt
def upload_file_view(request):
    request.upload_handlers.insert(0, ProgressBarUploadHandler(request))
    return _upload_file_view(request)

@csrf_protect
def _upload_file_view(request):
    ... # Process request