Django实现文件上传和下载功能

2019-11-25 11:37:41

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本文实例为大家分享了Django下完成文件上传和下载功能的具体代码，供大家参考，具体内容如下

一、文件上传

Views.py

def upload(request): if request.method == "POST": # 请求方法为POST时，进行处理 myFile = request.FILES.get("myfile", None) # 获取上传的文件，如果没有文件，则默认为None if not myFile: return HttpResponse("no files for upload!") # destination=open(os.path.join('upload',myFile.name),'wb+') destination = open( os.path.join("你的文件存放地址", myFile.name), 'wb+') # 打开特定的文件进行二进制的写操作 for chunk in myFile.chunks(): # 分块写入文件 destination.write(chunk) destination.close() return HttpResponse("upload over!") else: file_list = [] files = os.listdir('D:/python/Salary management system/django/managementsystem//file') for i in files: file_list.append(i) return render(request, 'upload.html', {'file_list': file_list})

urls.py

url(r'download/$',views.download),

upload.html

<div class="container-fluid"> <div class="row"> <form enctype="multipart/form-data" action="/upload_file/" method="POST"> <input type="file" name="myfile"/> <br/> <input type="submit" value="upload"/> </form> </div></div>

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二、文件下载

Views.py

from django.http import HttpResponse,StreamingHttpResponsefrom django.conf import settings def download(request): filename = request.GET.get('file') filepath = os.path.join(settings.MEDIA_ROOT, filename) fp = open(filepath, 'rb') response = StreamingHttpResponse(fp) # response = FileResponse(fp) response['Content-Type'] = 'application/octet-stream' response['Content-Disposition'] = 'attachment;filename="%s"' % filename return response fp.close()

HttpResponse会直接使用迭代器对象，将迭代器对象的内容存储城字符串，然后返回给客户端，同时释放内存。可以当文件变大看出这是一个非常耗费时间和内存的过程。

而StreamingHttpResponse是将文件内容进行流式传输，StreamingHttpResponse在官方文档的解释是：

The StreamingHttpResponse class is used to stream a response from Django to the browser. You might want to do this if generating the response takes too long or uses too much memory.

这是一种非常省时省内存的方法。但是因为StreamingHttpResponse的文件传输过程持续在整个response的过程中，所以这有可能会降低服务器的性能。

urls.py