如何使用 flask 下载 PDF

Question

我正在尝试使用 flask 生成 pdf 文件下载，这是我的代码：

@app.route('/return-files/')
def return_files_tut():
    from flask import send_file
    with open(os.path.join(app.config['FACTURAS_FOLDER'],'Transferencia_a_otras_cuentas_1.pdf'), 'rb') as static_file:
        return send_file(static_file, attachment_filename='file.pdf')

但是我有以下缺点

[2021-06-21 23:34:44 +0000] [12] [ERROR] Error handling request /return-files/
plan-management       | Traceback (most recent call last):
plan-management       |   File "/usr/local/lib/python3.9/site-packages/gunicorn/workers/sync.py", line 136, in handle
plan-management       |     self.handle_request(listener, req, client, addr)
plan-management       |   File "/usr/local/lib/python3.9/site-packages/gunicorn/workers/sync.py", line 182, in handle_request
plan-management       |     resp.write_file(respiter)
plan-management       |   File "/usr/local/lib/python3.9/site-packages/gunicorn/http/wsgi.py", line 385, in write_file
plan-management       |     if not self.sendfile(respiter):
plan-management       |   File "/usr/local/lib/python3.9/site-packages/gunicorn/http/wsgi.py", line 355, in sendfile
plan-management       |     if not util.has_fileno(respiter.filelike):
plan-management       |   File "/usr/local/lib/python3.9/site-packages/gunicorn/util.py", line 574, in has_fileno
plan-management       |     obj.fileno()
plan-management       | ValueError: I/O operation on closed file

Answer 1

无需实际打开文件，直接发送文件即可...

请注意，此代码未经测试，但应该可以工作™

此外，我不会将导入放在函数本身中，因为每次执行函数时它都会导入。

from flask import send_file


@app.route('/return-files/')
def return_files_tut():
    filename = os.path.join(app.config['FACTURAS_FOLDER'],'Transferencia_a_otras_cuentas_1.pdf')
    return send_file(filename, attachment_filename='file.pdf', as_attachment=True)

如何使用 flask 下载 PDF

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