登入只要放在主頁就可以了，這裡為了美觀，把<form>用bootstrap的form-inline類修飾，如下樣子：

前臺程式碼如下：

{%extends 'main.html'%}
{%block header%}
<ul class='nav nav-pills'>
	<li><a href='/' class='h4 text-primary'>首頁</a></li>
	<li><a href='/member' class='h4 text-primary'>成員</a></li>
	<li><a href='/chat/1' class='h4 text-primary'>群聊</a></li>
	{%if not cookieName%}
	<form action='/' method='post' class='form-inline'>
		<div class='form-group'>
			<label class='sr-only'>使用者名稱</label>
			<input type='text' name='username' class='form-control' placeholder='使用者名稱'/>
		</div>
		<div class='form-group'>
			<label class='sr-only'>密碼</label>
			<input type='password' name='password' class='form-control' placeholder='密碼'/>
		</div>
		<button type='submit' class='btn btn-success'>登入</button>
		<a href='/register'>無帳號，請點選註冊</a>
	</form>
	{%else%}
	<li><a href='/user/{{cookieName}}' class='h4 text-primary'>歡迎：{{cookieName}}</a></li>
	<li><a href='/logout' class='h4 text-primary'>登出</a></li>
	{%end%}
</ul>
{%end%}
{%block content%}
<ul>
	{%for i in blogs%}
	<li><a href='/user/{{i[1]}}' class='text-success h4'>【{{i[1]}}】</a><a href='/blog/{{i[0]}}' class='text-primary h3'>{{i[2]}}</a></p><p class='text-muted h6'>{{i[3]}}</p></li>
	<br/>
	{%end%}
</ul>
{%end%}
 

class indexHandler(tornado.web.RequestHandler):
	def get(self):
		name=self.get_cookie('hackerName')
		blogs=showAllBlog()
		self.render('index.html',cookieName=name,blogs=blogs)
	def post(self):
		name=self.get_argument('username')
		pw=self.get_argument('password')
		res=check(name,pw)
		if res: #密碼正確
			self.set_cookie('hackerName',name)
		else: #密碼錯誤
			pass
		self.redirect('/')
 

def showAllBlog():
	c.execute('select id,name,title,time from blog')
	tmp=c.fetchall()
	return tmp[::-1]

CREATE TABLE blog(id integer primary key,name text,title text,blog text,time text);

點選使用者名稱可以進入該使用者的主頁。