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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

復制代碼代碼如下:

.
├── 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 "<img src='static/images/%s' alt=''/>" % 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

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8"/>

    <title>Flask DEMO</title>

    <link rel="stylesheet" type="text/css" href="static/css/index.css"/>

</head>

<body>

    <div class="header">

        {%if islogin == '1' %}

        <h1>Welcome ,{{username}}!</h1>

        {%else%}

        <h1>{{username}}!</h1>

        {%endif%}

        <div class="nav">

            <ul>

                {%for nav in nav_list%}

                <li><a href="{{nav}}">{{nav}}</a></li>

                {%endfor%}

            </ul>

        </div>

    </div>

    <div class="container">

        <div class="item">

            <h1>{{blog['title']}}</h1>

            <div class="content">

                <img src="/static/images/cat.jpg" alt="cat" />

                <p>{{blog['content']}}</p>

                <img src="{{img}}" alt="cat" />

            </div>

        </div>

        <div class="side">

            <ul>

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

                    <li>{{key}}({{value}})</li>

                {%endfor%}

            </ul>

        </div>

    </div>

</body>

</html>

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

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8"/>

    <title>Login</title>

    <link rel="stylesheet" type="text/css" href="static/css/index.css"/>

</head>

<body>

    <div class="header">

        <h1>Login</h1>

    </div>

    <div class="container">

        <div class="item">

            <form action="" method="post">

                <input type="text" placeholder="please input username" name="username" /><br/>

                <input type="submit" value="Login"/>

            </form>

        </div>

    </div>

</body>

</html>

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

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8"/>

    <title>Regist</title>

    <link rel="stylesheet" type="text/css" href="static/css/index.css"/>

</head>

<body>

    <div class="header">

        <h1>Regist</h1>

    </div>

    <div class="container">

        <div class="item">

            <form action="" method="post">

                <input type="text" placeholder="please input username" name="username" /><br/>

                <input type="submit" value="Regist"/>

            </form>

        </div>

    </div>

</body>

</html>

結合blog.py主要展示了數據庫操作。

6、上傳頁面upload.html

復制代碼代碼如下:

	
	<!DOCTYPE html>

	<html>

	<head>

	    <meta charset="utf-8"/>

	    <title>Upload</title>

	    <link rel="stylesheet" type="text/css" href="static/css/index.css"/>

	</head>

	<body>

	    <div class="header">

	        <h1>Upload</h1>

	    </div>

	    <div class="container">

	        <div class="item">

	            <form action="" method="post" enctype="multipart/form-data">

	                <input type="text" name="username" /><br/>

	                <input type="file" name="img" /><br/>

	                <input type="submit" value="Upload"/>

	            </form>

	        </div>

	    </div>

	</body>

	</html>