Django实现下载超大CSV文件的示例代码

from django.http import StreamingHttpResponse

def big_file_download(request):
    def file_iterator(file_name, chunk_size=512):
        with open(file_name, "rb") as f:
            while True:
                c = f.read(chunk_size)
                if c:
                    yield c
                else:
                    break
    response = StreamingHttpResponse(file_iterator('big_file.csv'))
    return response

import csv
from django.http import StreamingHttpResponse
from .models import Person

class Echo:
    def write(self, value):
        return value

def streaming_csv_view(request):
    persons = Person.objects.all().values_list('name', 'age', 'city')
    pseudo_buffer = Echo()
    writer = csv.writer(pseudo_buffer)
    
    response = StreamingHttpResponse((writer.writerow(person) for person in persons),
                                     content_type="text/csv")
    response['Content-Disposition'] = 'attachment; filename="persons.csv"'
    return response