Tornado 简单示例
案例1
import tornado.web
import tornado.ioloop
class IndexHandler(tornado.web.RequestHandler):
def get(self, *args, **kwargs):
return self.write('hello world')
app = tornado.web.Application([
(r'/', IndexHandler),
])
app.listen(8089)
tornado.ioloop.IOLoop.instance().start()
输入 网址 http://127.0.0.1:8089/
案例2
import tornado.web
import tornado.ioloop
class IndexHandler(tornado.web.RequestHandler):
def get(self, *args, **kwargs):
return self.render(template_name='templates/login.html')
def post(self, *args, **kwargs):
username = self.get_body_argument('username')
return self.write(username)
app = tornado.web.Application([
(r'/', IndexHandler),
(r'/login/', IndexHandler),
])
app.listen(8888)
tornado.ioloop.IOLoop.instance().start()
templates/login.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="/login/", method="post">
<p>
用户名 <input type="text" name="username">
</p>
<p>
密码 <input type="text" name="pwd">
</p>
<input type="submit" value="登录">
</p>
</form>
</body>
</html>
访问http://127.0.0.1:8089/
案例3 单文件上传
import tornado.web
import tornado.ioloop
import os
class UploadHandler(tornado.web.RequestHandler):
@staticmethod
def makeuploadfiles(fileinfo: list):
filedict = fileinfo[0]
filename, filedata = filedict.get('filename'), filedict.get('body')
content_type = filedict.get('content_type')
filepath = os.path.join(os.getcwd(), 'files', filename)
filedirpath = os.path.dirname(filepath)
return filepath, filedirpath, filedata, content_type
def get(self, *args, **kwargs):
return self.render('templates/upload.html')
def post(self, *args, **kwargs):
fileinfo = self.request.files['fileinfo']
if len(fileinfo) == 1:
filepath, filedirpath, filedata,content_type = self.makeuploadfiles(fileinfo)
if not os.path.exists(filedirpath):
os.makedirs(filedirpath)
with open(filepath, 'wb') as fw:
fw.write(filedata)
self.set_header(name='Content-Type', value=content_type)
self.write(filedata)
app = tornado.web.Application([
(r'/upload/',UploadHandler)
])
app.listen(8888)
tornado.ioloop.IOLoop().instance().start()
templates/upload.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="/upload/", method="post", enctype="multipart/form-data">
<input type="file" name="fileinfo">
<input type="submit" value="上传">
</form>
</body>
</html>