web.py 十分钟创建简易博客实现代码

一、web.py简介
web.py是一款轻量级的Python web开发框架，简单、高效、学习成本低，特别适合作为python web开发的入门框架。官方站点：http://webpy.org/

二、web.py安装
1、下载：http://webpy.org/static/web.py-0.33.tar.gz
2、解压并进入web.py-0.33目录，安装：python setup.py install

三、创建简易博客
1、目录说明：主目录blog/，模板目录blog/templates
2、在数据库“test”中创建表“entries”

CREATE TABLE entries ( 
  id INT AUTO_INCREMENT,title TEXT,content TEXT,posted_on DATETIME,primary key (id) 
);

3、在主目录创建blog.py，blog/blog.py

#载入框架
import web
#载入数据库操作model（稍后创建）
import model
#URL映射
urls = (
    '/','Index','/view/(/d+)','View','/new','New','/delete/(/d+)','Delete','/edit/(/d+)','Edit','/login','Login','/logout','Logout',)
app = web.application(urls,globals())
#模板公共变量
t_globals = {
  'datestr': web.datestr,'cookie': web.cookies,}
#指定模板目录，并设定公共模板
render = web.template.render('templates',base='base',globals=t_globals)
#创建登录表单
login = web.form.Form(
           web.form.Textbox('username'),web.form.Password('password'),web.form.Button('login')
           )
#首页类
class Index:
  def GET(self):
    login_form = login()
    posts = model.get_posts()
    return render.index(posts,login_form)
  def POST(self):
    login_form = login()
    if login_form.validates():
      if login_form.d.username == 'admin' /
        and login_form.d.password == 'admin':
        web.setcookie('username',login_form.d.username)
    raise web.seeother('/')
#查看文章类
class View:
  def GET(self,id):
    post = model.get_post(int(id))
    return render.view(post)
#新建文章类
class New:
  form = web.form.Form(
             web.form.Textbox('title',web.form.notnull,size=30,description='Post title: '),web.form.Textarea('content',rows=30,cols=80,description='Post content: '),web.form.Button('Post entry'),)
  def GET(self):
    form = self.form()
    return render.new(form)
  def POST(self):
    form = self.form()
    if not form.validates():
      return render.new(form)
    model.new_post(form.d.title,form.d.content)
    raise web.seeother('/')
#删除文章类
class Delete:
  def POST(self,id):
    model.del_post(int(id))
    raise web.seeother('/')
#编辑文章类
class Edit:
  def GET(self,id):
    post = model.get_post(int(id))
    form = New.form()
    form.fill(post)
    return render.edit(post,form)
  def POST(self,id):
    form = New.form()
    post = model.get_post(int(id))
    if not form.validates():
      return render.edit(post,form)
    model.update_post(int(id),form.d.title,form.d.content)
    raise web.seeother('/')
#退出登录
class Logout:
  def GET(self):
    web.setcookie('username','',expires=-1)
    raise web.seeother('/')
#定义404错误显示内容
def notfound():
  return web.notfound("Sorry,the page you were looking for was not found.")
  
app.notfound = notfound
#运行
if __name__ == '__main__':
  app.run()

4、在主目录创建model.py，blog/model.py

import web
import datetime
#数据库连接
db = web.database(dbn = '<a href="http://lib.csdn.net/base/14" class='replace_word' title="MySQL知识库" target='_blank' style='color:#df3434; font-weight:bold;'>MySQL</a>',db = 'test',user = 'root',pw = '123456')
#获取所有文章
def get_posts():
  return db.select('entries',order = 'id DESC')
  
#获取文章内容
def get_post(id):
  try:
    return db.select('entries',where = 'id=$id',vars = locals())[0]
  except IndexError:
    return None
#新建文章
def new_post(title,text):
  db.insert('entries',title = title,content = text,posted_on = datetime.datetime.utcnow())
#删除文章
def del_post(id):
  db.delete('entries',where = 'id = $id',vars = locals())
  
#修改文章
def update_post(id,title,text):
  db.update('entries',vars = locals(),content = text)

5、在模板目录依次创建：base.html、edit.html、index.html、new.html、view.html

<!-- base.html -->
$def with (page)
<html>
  <head>
    <title>My Blog</title>
    <mce:style><!--
      #menu {
        width: 200px;
        float: right;
      }
    
--></mce:style><style mce_bogus="1">      #menu {
        width: 200px;
        float: right;
      }
    </style>
  </head>
  
  <body>
    <ul id="menu">
      <li><a href="/" mce_href="">Home</a></li>
      $if cookie().get('username'):
        <li><a href="/new" mce_href="new">New Post</a></li>
    </ul>
    
    $:page
  </body>
</html>

<!-- edit.html -->
$def with (post,form)
<h1>Edit $form.d.title</h1>
<form action="" method="post">
  $:form.render()
</form>
<h2>Delete post</h2>
<form action="/delete/$post.id" method="post">
  <input type="submit" value="Delete post" />
</form>

<!-- index.html -->
$def with (posts,login_form)
<h1>Blog posts</h1>
$if not cookie().get('username'):
  <form action="" method="post">
  $:login_form.render()
  </form>
$else:
  Welcome $cookie().get('username')!<a href="/logout" mce_href="logout">Logout</a>
<ul>
  $for post in posts:
    <li>
      <a href="/view/$post.id" mce_href="view/$post.id">$post.title</a>
      on $post.posted_on
      $if cookie().get('username'):
        <a href="/edit/$post.id" mce_href="edit/$post.id">Edit</a>
        <a href="/delete/$post.id" mce_href="delete/$post.id">Del</a>
    </li>
</ul>

<!-- new.html -->
$def with (form)
<h1>New Blog Post</h1>
<form action="" method="post">
$:form.render()
</form>

<!-- view.html -->
$def with (post)
<h1>$post.title</h1>
$post.posted_on<br />
$post.content

6、进入主目录在命令行下运行：python blog.py，将启动web服务，在浏览器输入：http://localhost:8080/，简易博客即已完成。

web.py 十分钟创建简易博客实现代码

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