一、Flask簡介
Flask 是一個 Python 實現的 Web 開發微框架。官網：http://flask.pocoo.org/
二、Demo
1、代碼結構
.
├── blog.py
├── static
│?? ├── css
│?? │?? └── index.css
│?? ├── images
│?? │?? ├── cat.jpg
│?? │?? └── sheying1229.jpg
│?? └── js
└── templates
??? ├── index.html
??? ├── login.html
??? ├── regist.html
??? └── upload.html
5 directories, 8 files
2、主程序blog.py
#!/usr/bin/python
#coding:utf8
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'請先登錄'
??? islogin = session.get('islogin')
??? nav_list = [u'首頁',u'經濟',u'文化',u'科技',u'娛樂']
??? 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 "
??? 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)
主要有首頁、注冊、登錄、上傳頁面。
blog.py主要是展示了Flask中常見功能用法：路由，數據庫操作，cookie，session，redirect，表單，文件上傳，調試，Web服務器的IP和端口，靜態文件讀取等。
3、首頁模板index.html
???
???
???
???
??????? {%if islogin == '1' %}
???????
Welcome ,{{username}}!
??????? {%else%}
???????
{{username}}!
??????? {%endif%}
???????
???
???
???????
???????????
{{blog['title']}}
???????????
???????????????
???????????????
{{blog['content']}}
???????????????
???????????
???????
???????
???????????
- {{key}}({{value}})
??????????????? {%for key,value in blogtag.items()%}
???????????????????
??????????????? {%endfor%}
???????????
???????
???
這個模板主要展示了在Flask模板中如何讀取各種類型的變量。
4、登錄頁面login.html
???
???
???
???
???????
Login
???
???
???????
???????????
???????
???
結合blog.py主要展示表單如何提交取值，cookie和session應用。
5、注冊頁面regist.html
???
???
???
???
???????
Regist
???
???
???????
???????????
???????
???
結合blog.py主要展示了數據庫操作。
6、上傳頁面upload.html
???
???
???
???
???????
Upload
???
???
???????
???????????
???????
???
結合blog.py主要展示了如何上傳文件。
7、運行效果
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