PythonWeb框架Flask下网站开发入门实例

from flask import Flask, render_template, url_for, request,redirect,make_response,session
import os,MySQLdb

app = Flask(__name__)
app.secret_key='afjlsjfowflajflkajfkjfkaljf'
user_list = ['jim','max','py']

imagepath = os.path.join(os.getcwd(),"static/images")

@app.route('/')
def index():
username = request.cookies.get('username')
if not username:
username = u'请先登录'
islogin = session.get('islogin')
nav_list = [u'首页',u'经济',u'文化',u'科技',u'娱乐']
blog = {'title':'welcome to my blog','content':'hello, welcome to my blog.'}
blogtag = {'javascript':10,"python":20,"shell":5}
img = url_for('static', filename="images/cat.jpg")
return render_template('index.html', nav_list=nav_list, username=username, blog = blog, blogtag = blogtag, img=img, islogin=islogin)

@app.route('/reg', methods=['GET','POST'])
def regist():
if request.method == 'POST':
username = request.form['username']
conn = MySQLdb.connect(user='root',passwd='admin',host='127.0.0.1')
conn.select_db('blog')
curr = conn.cursor()
sql = 'insert into `user` (`id`,`username`) values (%d,"%s")' % (1,username)
curr.execute(sql)
conn.commit()
curr.close()
conn.close()
return "user %s regist ok!" % request.form['username']
else:
#request.args['username']
return render_template('regist.html')

@app.route('/upload', methods=['GET','POST'])
def upload():
if request.method == 'POST':
username = request.form['username']
file = request.files['img']
filename = file.filename
file.save(os.path.join(imagepath,filename))
return "" % filename
else:
return render_template('upload.html')

@app.route('/login/', methods=['GET','POST'])
def login():
if request.method == 'POST':
username = request.form.get('username')
if username in user_list:
response = make_response(redirect('/'))
response.set_cookie('username', value=username, max_age=300)
session['islogin'] = '1'
return response
else:
session['islogin'] = '0'
return redirect('/login/')
else:
return render_template('login.html')

if __name__ == '__main__':
app.run(debug=True,host='0.0.0.0',port=5000)

主要有首页、注册、登录、上传页面。

blog.py主要是展示了Flask中常见功能用法：路由，数据库操作，cookie，session，redirect，表单，文件上传，调试，Web服务器的IP和端口，静态文件读取等。

3、首页模板index.html

代码如下:

{%if islogin == '1' %}

Welcome ,{{username}}!

{%else%}

{{username}}!

{%endif%}

{%for nav in nav_list%}

• {{nav}}

{%endfor%}

{{blog['title']}}

{{blog['content']}}

{%for key,value in blogtag.items()%}

• {{key}}({{value}})

{%endfor%}

这个模板主要展示了在Flask模板中如何读取各种类型的变量。

4、登录页面login.html

代码如下:

Login

结合blog.py主要展示表单如何提交取值，cookie和session应用。

5、注册页面regist.html

代码如下:

Regist

结合blog.py主要展示了数据库操作。

6、上传页面upload.html

代码如下:

Upload

结合blog.py主要展示了如何上传文件。

7、运行效果