Django框架文件下载的实现？

Question

用 Django 实现的资源分享网站，在写下载的时候出现了点问题，不知道怎么办，百度不到，就来问问，在线等，急。

这个是报的错，文件是通过 model 的 FileField 和 form 的 FileField 的传到 upload 文件夹的。

def resource_upload(req):
    if req.method == 'POST':
        ruf = ReUpForm(req.POST, req.FILES)
        if ruf.is_valid():
            resource = Resource()
            resource.re_name = ruf.cleaned_data['re_name']
            resource.re_file = ruf.cleaned_data['re_file']
            resource.post_img = ruf.cleaned_data['post_img']
            resource.pre_img1 = ruf.cleaned_data['pre_img1']
            resource.pre_img2 = ruf.cleaned_data['pre_img2']
            resource.rating = ruf.cleaned_data['rating']
            resource.re_class = ruf.cleaned_data['re_class']
            resource.re_year = ruf.cleaned_data['re_year']
            resource.summary = ruf.cleaned_data['summary']
            resource.save()
            return render_to_response('uploadsuccess.html', {})
        else:
            return render_to_response('upload.html', {'ruf': ruf, 'error_info': '上传出错，请重新填写上传信息.'})
    else:
        ruf = ReUpForm()
        return render_to_response('upload.html', {'ruf': ruf, 'error_info': ''})

这是上传代码

def download(req):
    re_id = int(req.session.get('id'))
    resource = Resource.objects.get(id = re_id)
    
    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
            f.close()
                    
    the_file_name =  str(resource.re_file)
    print type(the_file_name)
    response = StreamingHttpResponse(file_iterator(the_file_name))
    response['Content-Type'] = 'application/octet-stream'
    response['Content-Disposition'] = 'attachment;filename="{0}"'.format(the_file_name)
    
    return response

这是下载代码，麻烦帮我看下吧~~

Answer 1

加上了绝对路径缺少的那部分，Django不可以使用相对路径的吗？

Answer 2

如果是相对路径，则文件和项目要在同一个目录下

Answer 3

看了代码没有问题，唯一可能有问题的地方the_file_name，是指向文件存放地吗