flask 文件上传

#!/usr/bin/env python
#coding=utf-8
 
from flask import Flask,url_for,request,render_template,redirect,abort,escape,session
from werkzeug import secure_filename
 
print __name__
app = Flask(__name__)
app.secret_key = 'hello'
 
@app.route('/')
def index():
    return "hello flask"
 
@app.route('/user/<username>')
def show_username(username):
    return username
 
@app.route('/post/<int:post_id>')
def show_post(post_id
):

    return 'post_id:%d' % post_id

 

#if you visit /projects will redirect /projects/

@app.route('/projects/')

def projects():

    return 'the project page'

 

#if you visit /about/ will return 404 error

@app.route('/about')

def about():

    return 'the about page'

 

@app.route('/upload/',methods=['GET','POST'])

def upload_file():

    if request.method == 'POST':

        f = request.files['the_file']

        f.save('./'+secure_filename(f.filename))

        return secure_filename(f.filename)

    else:

        return render_template('upload_file.html')

 

@app.route('/redirect/')

def test_redirect():

    return redirect(url_for('test_error'))

 

@app.route('/test_error/')

def test_error():

    #中断请求，并返回错误码

    abort(404)

 

@app.errorhandler(404)

def page_not_found(error):

    print error

    return render_template('page_not_found.html'),404

 

@app.route('/index/')

def test_session():

    if 'username' in session:

        return 'logged in as %s' % escape(session['username'])

    return redirect(url_for('login'))

 

@app.route('/login/',methods=['GET','POST'])

def login():

    if request.method == 'POST':

        session['username'] = request.form['username']

        return redirect(url_for('test_session'))

    else:

        return '''

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

        <input type=text name=username>

        <input type=submit value=login>

        </form>

        '''

@app.route('/logout/')

def logout():

    session.pop('username',None)

    return redirect(url_for('test_session'))

 

with app.test_request_context():

    print url_for('index')

    print url_for('index',next='/')

    print url_for('show_username',username='alex')

 

@app.route('/setcookie')

def set_cookie():

    if 'num' in request.cookies:

        count = int(request.cookies['num']) + 1

    else:

        count = 0

 

    #每个view最后返回的都是response对象,render_template内部做了处理

    #也可以这样表示response = make_response(render_template('index.html', count=100)) 

    #不设置max_age和expires时，默认是会话cookie，浏览器关闭后cookie就失效

    #domain可以设置跨域cookie,如domain=".example.com"，这样cookie可以 被"www.example.com,alex.example.com"共享

    response = app.make_response(str(count))  

    response.set_cookie('num',value=count,max_age=None,expires=None,domain=None)

    return response

 

if __name__ == '__main__':

    app.run(host="localhost",port=8888,debug=True)