Django实现文件上传和下载功能
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>
页面显示
二、文件下载
Views.py
from django.http import HttpResponse,StreamingHttpResponse from 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
url(r'^upload',views.upload),
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