Django生成PDF文档显示在网页上以及解决PDF中文显示乱码的问题

pip install django
pip install xhtml2pdf

class MessageForm(forms.Form):
  '''
  表单验证
  '''
  name = forms.CharField(required=True)
  degree = forms.CharField(required=True)
  edu = forms.CharField(required=True)
  work = forms.CharField(required=True)
  tech = forms.CharField(required=True)
  phone = forms.CharField(required=True)

class MessageView(View):
  def get(self, request):
    form = MessageForm(data=request.GET)
    return render(request, 'index.html', {
      'form': form
    })

  def post(self, request):
    form = MessageForm(data=request.POST)
    if form.is_valid():
      response = generate_pdf_response(context=form.cleaned_data)
      return response
    return redirect(reverse('pdf:message'))

def link_callback(uri):
  if uri.startswith(settings.MEDIA_URL):
    path = os.path.join(settings.MEDIA_ROOT,
              uri.replace(settings.MEDIA_URL, ""))
  elif uri.startswith(settings.STATIC_URL):
    path = os.path.join(settings.STATIC_ROOT,
              uri.replace(settings.STATIC_URL, ""))
  else:
    return uri

  # 确保本地文件存在
  if not os.path.isfile(path):
    raise Exception(
      "Media URI 必须以以下格式开头"
      f"'{settings.MEDIA_URL}' or '{settings.STATIC_URL}'")

  return path


def generate_pdf_response(context):
  response = HttpResponse(content_type="application/pdf")
  response["Content-Disposition"] = \
    f"attachment; filename='{context['name']}.pdf'"

  html = render_to_string("pdf.html", context=context)
  status = pisa.CreatePDF(html,
              dest=response,
              link_callback=link_callback)

  if status.err:
    return HttpResponse("PDF文件生成失败")
  return response

def font_patch():
  from reportlab.pdfbase.ttfonts import TTFont
  from reportlab.pdfbase import pdfmetrics
  from xhtml2pdf.default import DEFAULT_FONT
  pdfmetrics.registerFont(TTFont('yh', '{}/font/msyh.ttf'.format(
    settings.STATICFILES_DIRS[0])))
  DEFAULT_FONT['helvetica'] = 'yh'