tornado中实现文件上传与下载
2018-06-01 本文已影响69人
马小跳_
上传
#!/usr/bin/env python
# -*- coding: UTF-8 -*-
import tornado.ioloop
import tornado.web
import os
class UploadFileHandler(tornado.web.RequestHandler):
def get(self):
self.write('''
<html>
<head><title>Upload File</title></head>
<body>
<form action='file' enctype="multipart/form-data" method='post'>
<input type='file' name='file'/><br/>
<input type='submit' value='submit'/>
</form>
</body>
</html>
''')
def post(self):
#文件的暂存路径
upload_path=os.path.join(os.path.dirname(__file__),'files')
#提取表单中‘name’为‘file’的文件元数据
file_metas=self.request.files['file']
for meta in file_metas:
filename=meta['filename']
filepath=os.path.join(upload_path,filename)
#有些文件需要已二进制的形式存储，实际中可以更改
with open(filepath,'wb') as up:
up.write(meta['body'])
self.write('finished!')
app=tornado.web.Application([
(r'/file',UploadFileHandler),
])
if __name__ == '__main__':
app.listen(3000)
tornado.ioloop.IOLoop.instance().start()
下载
def post(self,filename):
print('i download file handler : ',filename)
#Content-Type这里我写的时候是固定的了，也可以根据实际情况传值进来
self.set_header ('Content-Type', 'application/octet-stream')
self.set_header ('Content-Disposition', 'attachment; filename='+filename)
#读取的模式需要根据实际情况进行修改
with open(filename, 'rb') as f:
while True:
data = f.read(buf_size)
if not data:
break
self.write(data)
#记得要finish
self.finish()
