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Tornado基本使用

时间:2016-04-20 17:58:31      阅读:170      评论:0      收藏:0      [点我收藏+]

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一、快速上手

#!/usr/bin/env python
# -*- coding:utf-8 -*-
  
import tornado.ioloop
import tornado.web
  
  
class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")
  
application = tornado.web.Application([
    (r"/index", MainHandler),
])
  
  
if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

第一步:执行脚本,监听 8888 端口

第二步:浏览器客户端访问 /index  -->  http://127.0.0.1:8888/index

第三步:服务器接受请求,并交由对应的类处理该请求

第四步:类接受到请求之后,根据请求方式(post / get / delete ...)的不同调用并执行相应的方法

第五步:方法返回值的字符串内容发送浏览器

 

二、路由系统

 路由系统其实就是 url 和 类 的对应关系,这里不同于其他框架,其他很多框架均是 url 对应 函数,Tornado中每个url对应的是一个类。

#!/usr/bin/env python
# -*- coding:utf-8 -*-
  
import tornado.ioloop
import tornado.web
  
  
class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")
  
class StoryHandler(tornado.web.RequestHandler):
    def get(self, story_id):
        self.write("You requested the story " + story_id)
  
class BuyHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("buy.wupeiqi.com/index")
  
application = tornado.web.Application([
    (r"/index", MainHandler),
    (r"/story/([0-9]+)", StoryHandler),
])
  
application.add_handlers(‘buy.wupeiqi.com$‘, [
    (r‘/index‘,BuyHandler),
])
  
if __name__ == "__main__":
    application.listen(80)
    tornado.ioloop.IOLoop.instance().start()

 

三、模板

Tornao中的模板语言和django中类似,模板引擎将模板文件载入内存,然后将数据嵌入其中,最终获取到一个完整的字符串,再将字符串返回给请求者。

Tornado 的模板支持“控制语句”和“表达语句”,控制语句是使用 {% 和 %} 包起来的 例如 {% if len(items) > 2 %}。表达语句是使用 {{  }} 包起来的,例如 {{ items[0] }}

控制语句和对应的 Python 语句的格式基本完全相同。我们支持 ifforwhile  try,这些语句逻辑结束的位置需要用 {% end %} 做标记。还通过 extends 和 block 语句实现了模板继承。这些在 template 模块 的代码文档中有着详细的描述。

技术分享
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
    <title>123456</title>
    <link href="{{static_url("css/common.css")}}" rel="stylesheet" />
    {% block CSS %}{% end %}
</head>
<body>

    <div class="pg-header">

    </div>
    
    {% block RenderBody %}{% end %}
   
    <script src="{{static_url("js/jquery-1.8.2.min.js")}}"></script>
    
    {% block JavaScript %}{% end %}

</body>
</html>
layout.html
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{% extends ‘layout.html‘%}
{% block CSS %}
    <link href="{{static_url("css/index.css")}}" rel="stylesheet" />
    <link href="/static/css/common.css" rel="stylesheet" />
{% end %}

{% block RenderBody %}
    <h1>Index</h1>



{% end %}

{% block JavaScript %}
    
{% end %}
index
#!/usr/bin/env python
# -*- coding:utf-8 -*-

import tornado.ioloop
import tornado.web


class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.render(‘index.html‘)


settings = {
    ‘template_path‘: ‘template‘,
    ‘static_path‘: ‘static‘,
    ‘static_url_prefix‘: ‘/static/‘,
}

application = tornado.web.Application([
    (r"/index", MainHandler),
], **settings)


if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

 

在模板中默认提供了一些函数、字段、类以供模板使用:

  • escapetornado.escape.xhtml_escape 的別名
  • xhtml_escapetornado.escape.xhtml_escape 的別名
  • url_escapetornado.escape.url_escape 的別名
  • json_encodetornado.escape.json_encode 的別名
  • squeezetornado.escape.squeeze 的別名
  • linkifytornado.escape.linkify 的別名
  • datetime: Python 的 datetime 模组
  • handler: 当前的 RequestHandler 对象
  • requesthandler.request 的別名
  • current_userhandler.current_user 的別名
  • localehandler.locale 的別名
  • _: handler.locale.translate 的別名
  • static_url: for handler.static_url 的別名
  • xsrf_form_htmlhandler.xsrf_form_html 的別名

 

 Tornado默认提供的这些功能其实本质上就是 UIMethodUIModule,我们也可以自定义从而实现类似于Django的simple_tag的功能:

 1、定义

技术分享
# uimethods.py
 
def tab(self):
    return UIMethod
uimethods.py
技术分享
#!/usr/bin/env python
# -*- coding:utf-8 -*-
from tornado.web import UIModule
from tornado import escape

class custom(UIModule):

    def render(self, *args, **kwargs):
        return escape.xhtml_escape(<h1>chenchao</h1>)
uimodules.py

 

 2、注册

技术分享
#!/usr/bin/env python
# -*- coding:utf-8 -*-
#!/usr/bin/env python
# -*- coding:utf-8 -*-

import tornado.ioloop
import tornado.web
from tornado.escape import linkify
import uimodules as md
import uimethods as mt

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.render(index.html)

settings = {
    template_path: template,
    static_path: static,
    static_url_prefix: /static/,
    ui_methods: mt,
    ui_modules: md,
}

application = tornado.web.Application([
    (r"/index", MainHandler),
], **settings)


if __name__ == "__main__":
    application.listen(8009)
    tornado.ioloop.IOLoop.instance().start()

main.py
main.py

 

3、使用

技术分享
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <link href="{{static_url("commons.css")}}" rel="stylesheet" />
</head>
<body>
    <h1>hello</h1>
    {% module custom(123) %}
    {{ tab() }}
</body>
index.html

 

 

 四、实用功能

 

1、静态文件

对于静态文件,可以配置静态文件的目录和前段使用时的前缀,并且Tornaodo还支持静态文件缓存。

技术分享
#!/usr/bin/env python
# -*- coding:utf-8 -*-

import tornado.ioloop
import tornado.web
import uimodules as md
import uimethods as mt


class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.render(index.html)


settings = {
    template_path: template,
    static_path: static,
    static_url_prefix: /static/,
    ui_methods: mt,
    ui_modules: md,
}

application = tornado.web.Application([
    (r"/index", MainHandler),
], **settings)


if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()
main.py
技术分享
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
    <title>123456</title>
    <link href="{{static_url("css/common.css")}}" rel="stylesheet" />

</head>
<body>

    <div class="pg-header">
          <h1>Index</h1>
    </div>
    
    <script src="{{static_url("js/jquery-1.8.2.min.js")}}"></script>
    

</body>
</html>    
index.html

备注:静态文件缓存的实现

技术分享
    def get_content_version(cls, abspath):

        data = cls.get_content(abspath)
        hasher = hashlib.md5()
        if isinstance(data, bytes):
            hasher.update(data)
        else:
            for chunk in data:
                hasher.update(chunk)
        return hasher.hexdigest()
静态文件缓存源码

 

 

2、csrf

Tornado中的跨站请求伪造和Django中的相似,跨站伪造请求(Cross-site request forgery)

技术分享
settings = {
    "xsrf_cookies": True,
}
application = tornado.web.Application([
    (r"/", MainHandler),
    (r"/login", LoginHandler),
], **settings)
配置
技术分享
<form action="/new_message" method="post">
  {{ xsrf_form_html() }}
  <input type="text" name="message"/>
  <input type="submit" value="Post"/>
</form>
普通表单使用
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function getCookie(name) {
    var r = document.cookie.match("\\b" + name + "=([^;]*)\\b");
    return r ? r[1] : undefined;
}

jQuery.postJSON = function(url, args, callback) {
    args._xsrf = getCookie("_xsrf");
    $.ajax({url: url, data: $.param(args), dataType: "text", type: "POST",
        success: function(response) {
        callback(eval("(" + response + ")"));
    }});
};
Ajax使用

注:Ajax使用时,本质上就是去获取本地的cookie,携带cookie再来发送请求

 

 3、cookie

 

Tornado中可以对cookie进行操作,并且还可以对cookie进行签名以防止伪造。

 a、基本操作

技术分享
class MainHandler(tornado.web.RequestHandler):
    def get(self):
        if not self.get_cookie("mycookie"):
            self.set_cookie("mycookie", "myvalue")
            self.write("Your cookie was not set yet!")
        else:
            self.write("Your cookie was set!")
cookie

b、签名

Cookie 很容易被恶意的客户端伪造。加入你想在 cookie 中保存当前登陆用户的 id 之类的信息,你需要对 cookie 作签名以防止伪造。Tornado 通过 set_secure_cookie 和 get_secure_cookie 方法直接支持了这种功能。 要使用这些方法,你需要在创建应用时提供一个密钥,名字为 cookie_secret。 你可以把它作为一个关键词参数传入应用的设置中:

技术分享
class MainHandler(tornado.web.RequestHandler):
    def get(self):
        if not self.get_secure_cookie("mycookie"):
            self.set_secure_cookie("mycookie", "myvalue")
            self.write("Your cookie was not set yet!")
        else:
            self.write("Your cookie was set!")
             
application = tornado.web.Application([
    (r"/", MainHandler),
], cookie_secret="61oETzKXQAGaYdkL5gEmGeJJFuYh7EQnp2XdTP1o/Vo=")
code

签名Cookie的本质是:

写cookie过程:

  • 将值进行base64加密
  • 对除值以外的内容进行签名,哈希算法(无法逆向解析)
  • 拼接 签名 + 加密值

读cookie过程:

  • 读取 签名 + 加密值
  • 对签名进行验证
  • base64解密,获取值内容

 注:许多API验证机制和安全cookie的实现机制相同。

技术分享
#!/usr/bin/env python
# -*- coding:utf-8 -*-
 
import tornado.ioloop
import tornado.web
 
 
class MainHandler(tornado.web.RequestHandler):
 
    def get(self):
        login_user = self.get_secure_cookie("login_user", None)
        if login_user:
            self.write(login_user)
        else:
            self.redirect(/login)
 
 
class LoginHandler(tornado.web.RequestHandler):
    def get(self):
        self.current_user()
 
        self.render(login.html, **{status: ‘‘})
 
    def post(self, *args, **kwargs):
 
        username = self.get_argument(name)
        password = self.get_argument(pwd)
        if username == wupeiqi and password == 123:
            self.set_secure_cookie(login_user, 陈超)
            self.redirect(/)
        else:
            self.render(login.html, **{status: 用户名或密码错误})
 
settings = {
    template_path: template,
    static_path: static,
    static_url_prefix: /static/,
    cookie_secret: aiuasdhflashjdfoiuashdfiuh
}
 
application = tornado.web.Application([
    (r"/index", MainHandler),
    (r"/login", LoginHandler),
], **settings)
 
 
if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()
基于cookie进行用户验证
技术分享
#!/usr/bin/env python
# -*- coding:utf-8 -*-
 
import tornado.ioloop
import tornado.web
 
class BaseHandler(tornado.web.RequestHandler):
 
    def get_current_user(self):
        return self.get_secure_cookie("login_user")
 
class MainHandler(BaseHandler):
 
    @tornado.web.authenticated
    def get(self):
        login_user = self.current_user
        self.write(login_user)
 
 
 
class LoginHandler(tornado.web.RequestHandler):
    def get(self):
        self.current_user()
 
        self.render(login.html, **{status: ‘‘})
 
    def post(self, *args, **kwargs):
 
        username = self.get_argument(name)
        password = self.get_argument(pwd)
        if username == wupeiqi and password == 123:
            self.set_secure_cookie(login_user, 陈超)
            self.redirect(/)
        else:
            self.render(login.html, **{status: 用户名或密码错误})
 
settings = {
    template_path: template,
    static_path: static,
    static_url_prefix: /static/,
    cookie_secret: aiuasdhflashjdfoiuashdfiuh,
    login_url: /login
}
 
application = tornado.web.Application([
    (r"/index", MainHandler),
    (r"/login", LoginHandler),
], **settings)
 
 
if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()
Tornado内部提供cookie验证

 

 

五、扩展功能

 1、自定义Session

a.知识储备

类的特殊成员

#!/usr/bin/env python
# -*- coding:utf-8 -*-
  
class Foo(object):
  
    def __getitem__(self, key):
        print  ‘__getitem__‘,key
  
    def __setitem__(self, key, value):
        print ‘__setitem__‘,key,value
  
    def __delitem__(self, key):
        print ‘__delitem__‘,key
  
  
  
obj = Foo()
result = obj[‘k1‘]
#obj[‘k2‘] = ‘chenchao‘
#del obj[‘k1‘]

b.session实现机制

#!/usr/bin/env python
# -*- coding:utf-8 -*-
  
import tornado.ioloop
import tornado.web
from hashlib import sha1
import os, time
  
session_container = {}
  
# 创建MD516进制的session_id create_session_id = lambda: sha1(‘%s%s‘ % (os.urandom(16), time.time())).hexdigest() class Session(object): session_id = "__sessionId__" # 自定义session的key名称 def __init__(self, request):
    
# 默认先从请求信息里获取自定义的cookie值 session_value = request.get_cookie(Session.session_id) if not session_value: self._id = create_session_id() else: self._id = session_value
# 设置cookie request.set_cookie(Session.session_id, self._id) def __getitem__(self, key): return session_container[self._id][key] def __setitem__(self, key, value): if session_container.has_key(self._id): session_container[self._id][key] = value else: session_container[self._id] = {key: value} def __delitem__(self, key): del session_container[self._id][key] class BaseHandler(tornado.web.RequestHandler): def initialize(self): # 创建Session的对象,将MainHandler的对象传入 self.my_session = Session(self)
# 继承自定义的BaseHandler class MainHandler(BaseHandler): def get(self): print self.my_session[‘c_user‘] # 获取session的值 print self.my_session[‘c_card‘] self.write(‘index‘) class LoginHandler(BaseHandler): def get(self): self.render(‘login.html‘, **{‘status‘: ‘‘}) def post(self, *args, **kwargs): username = self.get_argument(‘name‘) password = self.get_argument(‘pwd‘) if username == ‘chenchao‘ and password == ‘123‘:
# 设置session的值 self.my_session[‘c_user‘] = ‘chenchao‘ self.my_session[‘c_card‘] = ‘12312312309823012‘ self.redirect(‘/index‘) else: self.render(‘login.html‘, **{‘status‘: ‘用户名或密码错误‘}) settings = { ‘template_path‘: ‘template‘, ‘static_path‘: ‘static‘, ‘static_url_prefix‘: ‘/static/‘, ‘cookie_secret‘: ‘aiuasdhflashjdfoiuashdfiuh‘, ‘login_url‘: ‘/login‘ } application = tornado.web.Application([ (r"/index", MainHandler), (r"/login", LoginHandler), ], **settings) if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start()

  

 2、自定义模型绑定

模型绑定有两个主要功能:

  • 自动生成html表单
  • 用户输入验证

在之前学习的Django中为程序员提供了非常便捷的模型绑定功能,但是在Tornado中,一切需要自己动手!!!

技术分享
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <link href="{{static_url("commons.css")}}" rel="stylesheet" />
</head>
<body>
    <h1>hello</h1>
    <form action="/index" method="post">

        <p>hostname: <input type="text" name="host" /> </p>
        <p>ip: <input type="text" name="ip" /> </p>
        <p>port: <input type="text" name="port" /> </p>
        <p>phone: <input type="text" name="phone" /> </p>
        <input type="submit" />
    </form>
</body>
</html>
Html
#!/usr/bin/env python
# -*- coding:utf-8 -*-
  
import tornado.ioloop
import tornado.web
from hashlib import sha1
import os, time
import re
  
  
class MainForm(object):
    def __init__(self):
        self.host = "(.*)"
        self.ip = "^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$"
        self.port = ‘(\d+)‘
        self.phone = ‘^1[3|4|5|8][0-9]\d{8}$‘
  
    def check_valid(self, request):
        form_dict = self.__dict__
        for key, regular in form_dict.items():
            post_value = request.get_argument(key)
            # 让提交的数据 和 定义的正则表达式进行匹配
            ret = re.match(regular, post_value)
            print key,ret,post_value
  
  
class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.render(‘index.html‘)
    def post(self, *args, **kwargs):
        obj = MainForm()
        result = obj.check_valid(self)
        self.write(‘ok‘)
  
  
  
settings = {
    ‘template_path‘: ‘template‘,
    ‘static_path‘: ‘static‘,
    ‘static_url_prefix‘: ‘/static/‘,
    ‘cookie_secret‘: ‘aiuasdhflashjdfoiuashdfiuh‘,
    ‘login_url‘: ‘/login‘
}
  
application = tornado.web.Application([
    (r"/index", MainHandler),
], **settings)
  
  
if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

 

 由于请求的验证时,需要考虑是否可以为空以及正则表达式的复用,所以:

技术分享
#!/usr/bin/env python
# -*- coding:utf-8 -*-

import tornado.ioloop
import tornado.web
import re


class Field(object):

    def __init__(self, error_msg_dict, required):
        self.id_valid = False
        self.value = None
        self.error = None
        self.name = None
        self.error_msg = error_msg_dict
        self.required = required

    def match(self, name, value):
        self.name = name

        if not self.required:
            self.id_valid = True
            self.value = value
        else:
            if not value:
                if self.error_msg.get(required, None):
                    self.error = self.error_msg[required]
                else:
                    self.error = "%s is required" % name
            else:
                ret = re.match(self.REGULAR, value)
                if ret:
                    self.id_valid = True
                    self.value = ret.group()
                else:
                    if self.error_msg.get(valid, None):
                        self.error = self.error_msg[valid]
                    else:
                        self.error = "%s is invalid" % name


class IPField(Field):
    REGULAR = "^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$"

    def __init__(self, error_msg_dict=None, required=True):

        error_msg = {}  # {‘required‘: ‘IP不能为空‘, ‘valid‘: ‘IP格式错误‘}
        if error_msg_dict:
            error_msg.update(error_msg_dict)

        super(IPField, self).__init__(error_msg_dict=error_msg, required=required)


class IntegerField(Field):
    REGULAR = "^\d+$"

    def __init__(self, error_msg_dict=None, required=True):
        error_msg = {required: 数字不能为空, valid: 数字格式错误}
        if error_msg_dict:
            error_msg.update(error_msg_dict)

        super(IntegerField, self).__init__(error_msg_dict=error_msg, required=required)


class CheckBoxField(Field):

    def __init__(self, error_msg_dict=None, required=True):
        error_msg = {}  # {‘required‘: ‘IP不能为空‘, ‘valid‘: ‘IP格式错误‘}
        if error_msg_dict:
            error_msg.update(error_msg_dict)

        super(CheckBoxField, self).__init__(error_msg_dict=error_msg, required=required)

    def match(self, name, value):
        self.name = name

        if not self.required:
            self.id_valid = True
            self.value = value
        else:
            if not value:
                if self.error_msg.get(required, None):
                    self.error = self.error_msg[required]
                else:
                    self.error = "%s is required" % name
            else:
                if isinstance(name, list):
                    self.id_valid = True
                    self.value = value
                else:
                    if self.error_msg.get(valid, None):
                        self.error = self.error_msg[valid]
                    else:
                        self.error = "%s is invalid" % name


class FileField(Field):
    REGULAR = "^(\w+\.pdf)|(\w+\.mp3)|(\w+\.py)$"

    def __init__(self, error_msg_dict=None, required=True):
        error_msg = {}  # {‘required‘: ‘数字不能为空‘, ‘valid‘: ‘数字格式错误‘}
        if error_msg_dict:
            error_msg.update(error_msg_dict)

        super(FileField, self).__init__(error_msg_dict=error_msg, required=required)

    def match(self, name, value):
        self.name = name
        self.value = []
        if not self.required:
            self.id_valid = True
            self.value = value
        else:
            if not value:
                if self.error_msg.get(required, None):
                    self.error = self.error_msg[required]
                else:
                    self.error = "%s is required" % name
            else:
                m = re.compile(self.REGULAR)
                if isinstance(value, list):
                    for file_name in value:
                        r = m.match(file_name)
                        if r:
                            self.value.append(r.group())
                            self.id_valid = True
                        else:
                            self.id_valid = False
                            if self.error_msg.get(valid, None):
                                self.error = self.error_msg[valid]
                            else:
                                self.error = "%s is invalid" % name
                            break
                else:
                    if self.error_msg.get(valid, None):
                        self.error = self.error_msg[valid]
                    else:
                        self.error = "%s is invalid" % name

    def save(self, request, upload_path=""):

        file_metas = request.files[self.name]
        for meta in file_metas:
            file_name = meta[filename]
            with open(file_name,wb) as up:
                up.write(meta[body])


class Form(object):

    def __init__(self):
        self.value_dict = {}
        self.error_dict = {}
        self.valid_status = True

    def validate(self, request, depth=10, pre_key=""):

        self.initialize()
        self.__valid(self, request, depth, pre_key)

    def initialize(self):
        pass

    def __valid(self, form_obj, request, depth, pre_key):
        """
        验证用户表单请求的数据
        :param form_obj: Form对象(Form派生类的对象)
        :param request: Http请求上下文(用于从请求中获取用户提交的值)
        :param depth: 对Form内容的深度的支持
        :param pre_key: Html中name属性值的前缀(多层Form时,内部递归时设置,无需理会)
        :return: 是否验证通过,True:验证成功;False:验证失败
        """

        depth -= 1
        if depth < 0:
            return None
        form_field_dict = form_obj.__dict__
        for key, field_obj in form_field_dict.items():
            print key,field_obj
            if isinstance(field_obj, Form) or isinstance(field_obj, Field):
                if isinstance(field_obj, Form):
                    # 获取以key开头的所有的值,以参数的形式传至
                    self.__valid(field_obj, request, depth, key)
                    continue
                if pre_key:
                    key = "%s.%s" % (pre_key, key)

                if isinstance(field_obj, CheckBoxField):
                    post_value = request.get_arguments(key, None)
                elif isinstance(field_obj, FileField):
                    post_value = []
                    file_list = request.request.files.get(key, None)
                    for file_item in file_list:
                        post_value.append(file_item[filename])
                else:
                    post_value = request.get_argument(key, None)

                print post_value
                # 让提交的数据 和 定义的正则表达式进行匹配
                field_obj.match(key, post_value)
                if field_obj.id_valid:
                    self.value_dict[key] = field_obj.value
                else:
                    self.error_dict[key] = field_obj.error
                    self.valid_status = False


class ListForm(object):
    def __init__(self, form_type):
        self.form_type = form_type
        self.valid_status = True
        self.value_dict = {}
        self.error_dict = {}

    def validate(self, request):
        name_list = request.request.arguments.keys() + request.request.files.keys()
        index = 0
        flag = False
        while True:
            pre_key = "[%d]" % index
            for name in name_list:
                if name.startswith(pre_key):
                    flag = True
                    break
            if flag:
                form_obj = self.form_type()
                form_obj.validate(request, depth=10, pre_key="[%d]" % index)
                if form_obj.valid_status:
                    self.value_dict[index] = form_obj.value_dict
                else:
                    self.error_dict[index] = form_obj.error_dict
                    self.valid_status = False
            else:
                break

            index += 1
            flag = False


class MainForm(Form):

    def __init__(self):
        # self.ip = IPField(required=True)
        # self.port = IntegerField(required=True)
        # self.new_ip = IPField(required=True)
        # self.second = SecondForm()
        self.fff = FileField(required=True)
        super(MainForm, self).__init__()

#
# class SecondForm(Form):
#
#     def __init__(self):
#         self.ip = IPField(required=True)
#         self.new_ip = IPField(required=True)
#
#         super(SecondForm, self).__init__()


class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.render(index.html)
    def post(self, *args, **kwargs):
        # for i in  dir(self.request):
        #     print i
        # print self.request.arguments
        # print self.request.files
        # print self.request.query
        # name_list = self.request.arguments.keys() + self.request.files.keys()
        # print name_list

        # list_form = ListForm(MainForm)
        # list_form.validate(self)
        #
        # print list_form.valid_status
        # print list_form.value_dict
        # print list_form.error_dict

        # obj = MainForm()
        # obj.validate(self)
        #
        # print "验证结果:", obj.valid_status
        # print "符合验证结果:", obj.value_dict
        # print "错误信息:"
        # for key, item in obj.error_dict.items():
        #     print key,item
        # print self.get_arguments(‘favor‘),type(self.get_arguments(‘favor‘))
        # print self.get_argument(‘favor‘),type(self.get_argument(‘favor‘))
        # print type(self.get_argument(‘fff‘)),self.get_argument(‘fff‘)
        # print self.request.files
        # obj = MainForm()
        # obj.validate(self)
        # print obj.valid_status
        # print obj.value_dict
        # print obj.error_dict
        # print self.request,type(self.request)
        # obj.fff.save(self.request)
        # from tornado.httputil import HTTPServerRequest
        # name_list = self.request.arguments.keys() + self.request.files.keys()
        # print name_list
        # print self.request.files,type(self.request.files)
        # print len(self.request.files.get(‘fff‘))
        
        # obj = MainForm()
        # obj.validate(self)
        # print obj.valid_status
        # print obj.value_dict
        # print obj.error_dict
        # obj.fff.save(self.request)
        self.write(ok)



settings = {
    template_path: template,
    static_path: static,
    static_url_prefix: /static/,
    cookie_secret: aiuasdhflashjdfoiuashdfiuh,
    login_url: /login
}

application = tornado.web.Application([
    (r"/index", MainHandler),
], **settings)


if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

Form验证框架
Form验证框架

 

Tornado基本使用

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原文地址:http://www.cnblogs.com/chenchao1990/p/5413547.html

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