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web.py 十分鐘創(chuàng)建簡(jiǎn)易博客實(shí)現(xiàn)代碼

更新時(shí)間：2016年04月22日 22:04:53 作者：TCM-caleng

web.py是一款輕量級(jí)的Python web開(kāi)發(fā)框架，簡(jiǎn)單、高效、學(xué)習(xí)成本低，特別適合作為python web開(kāi)發(fā)的入門(mén)框架

一、web.py簡(jiǎn)介
web.py是一款輕量級(jí)的Python web開(kāi)發(fā)框架，簡(jiǎn)單、高效、學(xué)習(xí)成本低，特別適合作為python web開(kāi)發(fā)的入門(mén)框架。官方站點(diǎn)：http://webpy.org/

二、web.py安裝
1、下載：http://webpy.org/static/web.py-0.33.tar.gz
2、解壓并進(jìn)入web.py-0.33目錄，安裝：python setup.py install

三、創(chuàng)建簡(jiǎn)易博客
1、目錄說(shuō)明：主目錄blog/，模板目錄blog/templates
2、在數(shù)據(jù)庫(kù)“test”中創(chuàng)建表“entries”

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

3、在主目錄創(chuàng)建blog.py，blog/blog.py

#載入框架
import web
#載入數(shù)據(jù)庫(kù)操作model（稍后創(chuàng)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())
#模板公共變量
t_globals = {
 'datestr': web.datestr,
 'cookie': web.cookies,
}
#指定模板目錄，并設(shè)定公共模板
render = web.template.render('templates', base='base', globals=t_globals)
#創(chuàng)建登錄表單
login = web.form.Form(
      web.form.Textbox('username'),
      web.form.Password('password'),
      web.form.Button('login')
      )
#首頁(yè)類(lèi)
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('/')
#查看文章類(lèi)
class View:
 def GET(self, id):
  post = model.get_post(int(id))
  return render.view(post)
#新建文章類(lèi)
class New:
 form = web.form.Form(
       web.form.Textbox('title',
       web.form.notnull,
       size=30,
       description='Post title: '),
       web.form.Textarea('content',
       web.form.notnull,
       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('/')
#刪除文章類(lèi)
class Delete:
 def POST(self, id):
  model.del_post(int(id))
  raise web.seeother('/')
#編輯文章類(lèi)
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('/')
#退出登錄
class Logout:
 def GET(self):
  web.setcookie('username', '', expires=-1)
  raise web.seeother('/')
#定義404錯(cuò)誤顯示內(nèi)容
def notfound():
 return web.notfound("Sorry, the page you were looking for was not found.")
 
app.notfound = notfound
#運(yùn)行
if __name__ == '__main__':
 app.run()

4、在主目錄創(chuàng)建model.py，blog/model.py

import web
import datetime
#數(shù)據(jù)庫(kù)連接
db = web.database(dbn = 'MySQL', db = 'test', user = 'root', pw = '123456')
#獲取所有文章
def get_posts():
 return db.select('entries', order = 'id DESC')
 
#獲取文章內(nèi)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())
#刪除文章
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',
  where = 'id = $id',
  vars = locals(),
  title = title,
  content = text)

5、在模板目錄依次創(chuàng)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、進(jìn)入主目錄在命令行下運(yùn)行：python blog.py，將啟動(dòng)web服務(wù)，在瀏覽器輸入：http://localhost:8080/，簡(jiǎn)易博客即已完成。

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