Django Reportlab 生成空 pdf

Question

我正在使用 reportlab 创建 pdf。我正在使用 Reportlab 段落。问题是每次我下载它时，它都会生成一个空的 txt。我在没有 django 的情况下对其进行了测试，并且没有问题。如果我使用 canvas 它可以工作，但它不适合我的需要。

views.py

from django.http import HttpResponse
from django.shortcuts import render
from reportlab.lib.enums import TA_JUSTIFY
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.pagesizes import letter


def genereaza_pdf(request):
    if request.method == 'POST':
        response = HttpResponse(content_type='application/pdf')
        response['Content-Disposition'] = 'attachment; filename="example.pdf"'
        doc = SimpleDocTemplate("example.pdf", pagesize=letter, rightMargin=70, leftMargin=70, topMargin=70,
                                bottomMargin=60)
        report = []

        styles = getSampleStyleSheet()
        styles.add(ParagraphStyle(name="Times", fontName='Times-Roman', fontSize=15, alignment=TA_JUSTIFY))

        p_text = "<u>ANEXA 1</u>"
        report.append(Paragraph(p_text, styles["Times"]))
        report.append(Spacer(1, 5))
        doc.build(report)
        return response
    return render(request, 'pdf_test.html')

pdf_test.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Download pdf</title>
</head>
<body>
    <form method="POST">
        {% csrf_token %}
        <button type="submit">Download</button>
    </form>
</body>
</html>

好像是什么问题？

Answer 1

您必须将文件写入流。试试这个：

from io import BytesIO
def genereaza_pdf(request):
    if request.method == 'POST':
        response = HttpResponse(content_type='application/pdf')
        response['Content-Disposition'] = 'attachment; filename="example.pdf"'
        buff = BytesIO()
        doc = SimpleDocTemplate(buff, pagesize=letter, rightMargin=70, leftMargin=70, topMargin=70,
                                bottomMargin=60)
        report = []

        styles = getSampleStyleSheet()
        styles.add(ParagraphStyle(name="Times", fontName='Times-Roman', fontSize=15, alignment=TA_JUSTIFY))

        p_text = "<u>ANEXA 1</u>"
        report.append(Paragraph(p_text, styles["Times"]))
        report.append(Spacer(1, 5))
        doc.build(report)
        response.write(buff.getvalue())
        buff.close()
        return response
    return render(request, 'pdf_test.html')

Answer 2

该函数正在生成两个文件，一个默认在下载中，但它是一个空的 txt，另一个在项目目录中。我已经做了修改。

def genereaza_pdf(request):
    if request.method == 'POST':
        response = HttpResponse(content_type='application/pdf')
        response['Content-Disposition'] = 'attachment; filename="example.pdf"'
        doc = SimpleDocTemplate(response, pagesize=letter, rightMargin=70, leftMargin=70, topMargin=70,
                                bottomMargin=60)
        report = []

        styles = getSampleStyleSheet()
        styles.add(ParagraphStyle(name="Times", fontName='Times-Roman', fontSize=15, alignment=TA_JUSTIFY))

        p_text = "<u>ANEXA 1</u>"
        report.append(Paragraph(p_text, styles["Times"]))
        report.append(Spacer(1, 5))
        doc.build(report)
        return response
    return render(request, 'pdf_test.html')

Django Reportlab 生成空 pdf

Django Reportlab generates empty pdf

python

pdf

django

reportlab