flask

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
posted @ 2024-04-08 19:17  kakacarola  阅读(20)  评论(0)    收藏  举报