http方法
from flask import Flask, redirect, url_for, request
app = Flask(__name__)
@app.route('/success/<name>')
def success(name):
return 'welcome %s' % name
@app.route('/login',methods = ['POST', 'GET'])
def login():
if request.method == 'POST':
user = request.form['name']
return redirect(url_for('success',name = user))
else:
user = request.args.get('name')
return redirect(url_for('success',name = user))
if __name__ == '__main__':
app.run(debug = True)
user = request.form['name']
User = request.args.get('name')
url构建
from flask import Flask, redirect, url_for
app = Flask(__name__)
@app.route('/admin')
def hello_admin():
return 'Hello Admin'
@app.route('/guest/<guest>')
def hello_guest(guest):
return 'Hello %s as Guest' % guest
@app.route('/user/<name>')
def user(name):
if name =='admin':
return redirect(url_for('hello_admin'))
else:
return redirect(url_for('hello_guest',guest = name))
if __name__ == '__main__':
app.run(debug = True)
变量规则
from flask import Flask
app = Flask(__name__)
@app.route('/<id>')
def index(id):
if id=='1':
return '1'
if id==str(2):
return '2'
if int(id)==3:
return '3'
return 'Hello %s!' % name
@app.route('/user/<int:id>')#int正整数string不包含斜杠的文本float正浮点数path包含斜杠的文本
def index(id):
if id==1:
return '1'
if id==2:
return '2'
if id==3:
return '3'
return 'hello word'
if __name__ == '__main__':
app.run(debug = True)
表单
From flask import Flask,render_template
from_wtforms_import_StringField,PasswordField,SubmitField#类型
from flask_wtf import FlaskForm
from wtforms.validators import DataRequired,EqualTo #验证数据不能为空 验证数据是否相同
app = Flask(__name__)
app.config['SECRET_KEY']='ADJLAJDLA'
#定义表单模型类
class Register(FlaskForm):
user_name=StringField(label='用户名',validators=[DataRequired('用户名不能为空')])
password = PasswordField(label='密码',validators=[DataRequired('密码不能为空')])
password2 = PasswordField(label="密码',validators=[DataRequired('密码不能为空'),EqualTo('password')])
submit = SubmitField(label='提交')
@app.route('/register',methods=['GET','POST'])
def register():
#创建表单对象
form=Register()
if request.method=='GET':
return render_template(register.html,form=form)
if request.method=='POST':
if form.validata_on_submit(): #验证器
username=form.user_name.data
password=form.password.data
password2=form.password2.data
return render_template(register.html,form=form)
if __name__ == '__main__':
app.run(debug = True)
# {{form.csrf_token}}
静态文件
from flask import Flask, render_template
app = Flask(__name__)
@app.route("/")
def index():
return render_template("index.html")
if __name__ == '__main__':
app.run(debug = True)
index.html
<html>
<head>
<script type = "text/javascript"
src = "{{ url_for('static', filename = 'hello.js') }}" ></script>
</head>
<body>
<input type = "button" onclick = "sayHello()" value = "Say Hello" />
</body>
</html>
hello.js
function sayHello() {
alert("Hello World")
}
模板
from flask import Flask
app = Flask(__name__)
@app.route('/')
def index():
return '<html><body><h1>'Hello World'</h1></body></html>'
if __name__ == '__main__':
app.run(debug = True)
from flask import Flask, render_template
app = Flask(__name__)
@app.route('/<user>',methods=['GET','HOST'])
def index(user):
if request.method=='GET':
return render_template(‘hello.html’,name=user)
if request.method=='HOST':
name=request.form.get('name')
password=request.form.get('password')
print(name,password)
return ‘haha’
if __name__ == '__main__':
app.run(debug = True)
重定向和错误
from flask import Flask, redirect, url_for, render_template, request, abort
app = Flask(__name__)
@app.route('/')
def index():
return render_template('log_in.html')
@app.route('/login',methods = ['POST', 'GET'])
def login():
if request.method == 'POST': #request.method.get('GET')
if request.form['username'] == 'admin' :
return redirect(url_for('success') or 网址)
else:
abort(401)
return None
else:
return redirect(url_for('index'))
@app.errorhandler(404)
def handle_404_error(err):
return '出现了404错误 错误信息是%s'%err
@app.route('/success')
def success():
return 'logged in successfully'
if __name__ == '__main__':
app.run(debug = True)
Flask.redirect(location, statuscode, response)
location 参数是响应应该被重定向的URL。
statuscode 参数发送到浏览器的头标，默认为302。
response 参数用于实例化响应。
HTTP_300_MULTIPLE_CHOICES
HTTP_301_MOVED_PERMANENTLY
HTTP_302_FOUND
HTTP_303_SEE_OTHER
HTTP_304_NOT_MODIFIED
HTTP_305_USE_PROXY
HTTP_306_RESERVED
HTTP_307_TEMPORARY_REDIRECT
Flask.abort(code)
400 - 对于错误的请求
401 - 用于未经身份验证
403 - 禁止
404 - 未找到
406 - 不可接受
415 - 用于不支持的媒体类型
429 - 请求过多