Tornado 网站demo 三

模板

修改index.py

#!/usr/bin/env Python
# coding=utf-8

import tornado.web
import methods.readdb as mrd

class IndexHandler(tornado.web.RequestHandler):
    def get(self):
        usernames = mrd.select_columns(table="users",column="username")
        one_user = usernames[0][0]
        self.render("index.html", user=one_user)

    def post(self):
        username = self.get_argument("username")
        password = self.get_argument("password")
        user_infos = mrd.select_table(table="users",column="*",condition="username",value=username)
        if user_infos:
            db_pwd = user_infos[0][2]
            if db_pwd == password:
                self.write("welcome you: " + username)
            else:
                self.write("your password was not right.")
        else:
            self.write("There is no thi user.")

readdb.py 添加select_columns 方法

def select_columns(table, column ):
    sql = "select " + column + " from " + table
    cur.execute(sql)
    lines = cur.fetchall()
    return lines

修改index.html文件

<!DOCTYPE html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>Learning Python</title>
</head>

<body>
    <h2> 登录页面</h2>
    <p>用用户名为：{{user}}登录</p>
    <form method="POST">
        <p><span>UserName:</span><input type="text" id="username"/></p>
        <p><span>Password:</span><input type="password" id="password" /></p>
        <p><input type="BUTTON" value="登录" id="login" /></p>
    </form>
<script src="{{static_url('js/jquery-3.2.1.min.js')}}"></script>
<script src="{{static_url('js/script.js')}}"></script>
</body>

要求用户正确登录之后，跳转到另外一个页面，并且在那个页面中显示出用户的完整信息。

 先修改 url.py 文件，在其中增加一些内容

#!/usr/bin/env Python
# coding=utf-8
"""
the url structure of website
"""

#!/usr/bin/env Python
# coding=utf-8
"""
the url structure of website
"""

from handlers.index import IndexHandler
from handlers.user import UserHandler

url = [
    (r'/', IndexHandler),
    (r'/user', UserHandler),
]

然后就建立 handlers/user.py 文件

#!/usr/bin/env Python
# coding=utf-8

import tornado.web
import methods.readdb as mrd

class UserHandler(tornado.web.RequestHandler):
    def get(self):
        username = self.get_argument("user")
        user_infos = mrd.select_table(table="users",column="*",condition="username",value=username)
        self.render("user.html", users = user_infos)

修改script.js

/**
 * Created by fulong on 2017/6/14.
 */
$(document).ready(function(){
    $("#login").click(function(){
        var user = $("#username").val();
        var pwd = $("#password").val();
        var pd = {"username":user, "password":pwd};
        $.ajax({
            type:"post",
            url:"/",
            data:pd,
            cache:false,
            success:function(data){
                window.location.href = "/user?user="+data;
            },
            error:function(){
                alert("error!");
            },
        });
    });
});

user.html 模板

<!DOCTYPE html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>Learning Python</title>
</head>
<body>
    <h2>Your informations are:</h2>
    <ul>
        {% for one in users %}
            <li>username:{{one[1]}}</li>
            <li>password:{{one[2]}}</li>
            <li>email:{{one[3]}}</li>
        {% end %}
    </ul>
</body>

 模版中

    {% set website = "<a href='http://www.itdiffer.com'>welcome to my website</a>" %}
    {{ website }}

需要更改成如下方式完成 不转义，因为模版会自动帮转义

{% raw website %}

模版中备查函数

  • escape(s)：替换字符串 s 中的 &、<、> 为他们对应的 HTML 字符。
  • url_escape(s)：使用 urllib.quote_plus 替换字符串 s 中的字符为 URL 编码形式。
  • json_encode(val)：将 val 编码成 JSON 格式。
  • squeeze(s)：过滤字符串 s，把连续的多个空白字符替换成一个空格。

cookies

生成安全的密钥

>>> import base64, uuid
>>> base64.b64encode(uuid.uuid4().bytes)
'w8yZud+kRHiP9uABEXaQiA=='

如果要获取此 cookie，用 self.get_secure_cookie(username) 即可。

 

实例：https://emptysqua.re/blog/refactoring-tornado-coroutines/

posted @ 2017-06-26 11:59  Erick-LONG  阅读(530)  评论(0)  编辑  收藏  举报