Python之tornado框架实现翻页功能
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1、结果如图所示，这里将html页面与网站的请求处理放在不同地方了
start.py代码
import tornado.ioloop
import tornado.web
from controllers import home
settings = {
‘static_path‘:‘statics‘,#静态文件配置,需要特殊处理
‘static_url_prefix‘:‘/sss/‘,#标记文件开始的名字
}
#路由映射，根据不同url对应到不同的类里面
application = tornado.web.Application([
(r"/index/(?P<page>\\d*)", home.IndexHandler),
],**settings)#基于正则的路由,?P<page>表示为正则匹配到的内容起了一个名字
if __name__==‘__main__‘:
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()
home.py里面的代码
import tornado.web
List_Info=[
{‘username‘:‘jay‘,‘email‘:‘[email protected]‘}
]
class IndexHandler(tornado.web.RequestHandler):
def get(self,page):
#每页显示五条数据
#page是当前页
#第一页: 0:5 List_Info[0:5]
#第二页：5:10
#start: (page-1)*5
#end: (page)*5
try:page=int(page)
except:page=1
print(page)
if page <1:
page =1
start = (page - 1)*5
end = page * 5
current_ist = List_Info[start:end]
self.render(‘E:\\\\练习2\\\\tornado_day2\\\\views\\\\home\\\\index.html‘,list= current_ist,page=page)
#E:\\\\练习2\\\\tornado_day2\\\\views\\\\home\\\\index.html
def post(self,page):
user = self.get_argument(‘username‘)
email = self.get_argument(‘email‘)
temp = {‘username‘:user,‘email‘:email}
List_Info.append(temp)
self.redirect(‘/index/‘+page)
home文件里面的index.html代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>index首页</title>
</head>
<body>
<h1>提交数据</h1>
<form method="post" action="/index/{{page}}">
<input name="username" type="text">
<input name="email" type="text">
<input value="提交" type="submit">
</form>
<h1>显示数据</h1>
<table border="2">
<thead><tr>
<th>用户名</th>
<th>邮箱</th>
</tr></thead>
<tbody>
{% for line in list %}
<tr>
<td>{{line[‘username‘]}}</td>
<td>{{line[‘email‘]}}</td>
</tr>
{% end %}
</tbody>
</table>
</body>
</html>
运行结果如图
最后我们修改一下home里面的代码，实现选择页面功能
import tornado.web
List_Info=[
{‘username‘:‘jay‘,‘email‘:‘[email protected]‘}
]
for i in range(1000):
data = {‘username‘: i, ‘email‘: i * 2}
List_Info.append(data)
class IndexHandler(tornado.web.RequestHandler):
def get(self,page):
#每页显示五条数据
#page是当前页
#第一页: 0:5 List_Info[0:5]
#第二页：5:10
#start: (page-1)*5
#end: (page)*5
try:page=int(page)
except:page=1
if page <1:
page =1
start = (page - 1)*5
end = page * 5#每页最多显示五条数据
current_ist = List_Info[start:end]
all_page ,c = divmod(len(List_Info),5)#每五条数据一页，判断多少页
if c>0:#有余数则多一页
all_page +=1
list_page =[]
print(all_page)
if page <5:
for p in range(9):
if p+1 == page:
temp = ‘<a class="active" href="/index/%s">%s</a>‘ % (p+1,p+1)
else:
temp = ‘<a href="/index/%s">%s</a>‘ % (p + 1, p + 1)
list_page.append(temp)
elif page >all_page-5:#判断页数是否在最前或者最后五页
for p in range(all_page-9,all_page):
if p + 1 == page:
temp = ‘<a class="active" href="/index/%s">%s</a>‘ % (p + 1, p + 1)
else:
temp = ‘<a href="/index/%s">%s</a>‘ % (p + 1, p + 1)
list_page.append(temp)
else:
for p in range(page-5,page+4):
if p+1 == page:
temp = ‘<a class="active" href="/index/%s">%s</a>‘ % (p+1,p+1)
else:
temp = ‘<a href="/index/%s">%s</a>‘ % (p + 1, p + 1)
list_page.append(temp)
str_page = ‘‘.join(list_page)
# str_page = list_page，不写join则会在页面上显示逗号
self.render(‘E:\\\\练习2\\\\tornado_day2\\\\views\\\\home\\\\index.html‘,list= current_ist,page=page,str_page=str_page)
#E:\\\\练习2\\\\tornado_day2\\\\views\\\\home\\\\index.html
def post(self, page):
user = self.get_argument(‘username‘)
email = self.get_argument(‘email‘)
temp = {‘username‘:user,‘email‘:email}
List_Info.append(temp)
self.redirect(‘/index/‘+page)
print(List_Info)
对于index.html文件也要做少少修改
最后把home里面的代码封装一下，如图
import tornado.web
List_Info=[
{‘username‘:‘jay‘,‘email‘:‘[email protected]‘}
]
for i in range(1000):
data = {‘username‘: i, ‘email‘: i * 2}
List_Info.append(data)#认为创建1000条数据
class Pagination:
def __init__(self,current_page,all_item):
all_page, c = divmod(len(all_item), 5) # 每五条数据一页，判断多少页
self.all_page=all_page
if c > 0: # 有余数则多一页
all_page += 1
self.all_page = all_page#获取最大页面
try:
current_page=int(current_page)
except:
current_page=1
if current_page <1:
current_page =1
self.current_page = current_page
@property
def strat(self):
return (self.current_page-1)*5
@property
def end(self):
return self.current_page * 5
def get_page(self,base_url):
self.all_page, c = divmod(len(List_Info), 5) # 每五条数据一页，判断多少页
if c > 0: # 有余数则多一页
self.all_page += 1
list_page = []
if self.current_page < 5:
for p in range(9):
if p + 1 == self.current_page:
temp = ‘<a class="active" href="%s %s">%s</a>‘ % (base_url,p + 1, p + 1)
else:
temp = ‘<a href="%s%s">%s</a>‘ % (base_url,p + 1, p + 1)
list_page.append(temp)
elif self.current_page > self.all_page - 5: # 判断页数是否在最前或者最后五页
for p in range(self.all_page - 9, self.all_page):
if p == self.current_page:
temp = ‘<a class="active" href="%s %s">%s</a>‘ % (base_url, p , p )
else:
temp = ‘<a href="%s%s">%s</a>‘ % (base_url, p, p )
list_page.append(temp)
else:
for p in range(self.current_page - 5, self.current_page + 4):
if p == self.current_page:
temp = ‘<a class="active" href="%s %s">%s</a>‘ % (base_url, p , p)
else:
temp = ‘<a href="%s%s">%s</a>‘ % (base_url, p , p )
list_page.append(temp)
str_page = ‘‘.join(list_page)
return str_page
# str_page = list_page，不写join则会在页面上显示逗号
class IndexHandler(tornado.web.RequestHandler):
def get(self,page):
page_obj =Pagination(page,List_Info)#把当前访问页以及要传给前端的数据传给类里面
current_ist =List_Info[page_obj.strat:page_obj.end]#以访问字段的方式访问方法，获取数据
str_page = page_obj.get_page(‘/index/‘)#底下的页数码
self.render(‘E:\\\\练习2\\\\tornado_day2\\\\views\\\\home\\\\index.html‘,list= current_ist,page=page_obj.current_page,str_page=str_page)
#page_obj.current_page表示把处理过的页数传进去
def post(self, page):
user = self.get_argument(‘username‘)
email = self.get_argument(‘email‘)
temp = {‘username‘:user,‘email‘:email}
List_Info.append(temp)
self.redirect(‘/index/‘+page)
print(List_Info)
运行如图
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