before_request、after_request
from flask import Flask,render_template,redirect
app = Flask(__name__)
"""
before_reuqest = [xxxxxxxxxx1,xxxxxxxxxx2]
"""
@app.before_request
def xxxxxxxxxx1():
print('前1')
@app.before_request
def xxxxxxxxxx2():
print('前2')
"""
after_request = [oooooooo1,oooooooo2]
[oooooooo2,oooooooo1,] reversed(after_request)
"""
@app.after_request
def oooooooo1(response):
print('后1')
return response
@app.after_request
def oooooooo2(response):
print('后2')
return response
@app.route('/x1',methods=['GET','POST'])
def x1():
print('视图函数x1')
return "视图函数x1"
@app.route('/x2',methods=['GET','POST'])
def x2():
print('视图函数x2')
return "视图函数x2"
if __name__ == '__main__':
app.__call__
app.run()before_request返回
from flask import Flask,render_template,redirect
app = Flask(__name__)
@app.before_request
def xxxxxxxxxx1():
print('前1')
return "不要再来烦我了"
@app.before_request
def xxxxxxxxxx2():
print('前2')
@app.after_request
def oooooooo1(response):
print('后1')
return response
@app.after_request
def oooooooo2(response):
print('后2')
return response
@app.route('/x1',methods=['GET','POST'])
def x1():
print('视图函数x1')
return "视图函数x1"
@app.route('/x2',methods=['GET','POST'])
def x2():
print('视图函数x2')
return "视图函数x2"
if __name__ == '__main__':
app.__call__
app.run()before_request实现用户登录
from flask import Flask,render_template,redirect,request,session
app = Flask(__name__)
app.secret_key = 'asdfasdfasdf'
@app.before_request
def check_login():
if request.path == '/login':
return None
user = session.get('user_info')
if not user:
return redirect('/login')
@app.route('/login',methods=['GET','POST'])
def login():
return "视图函数x1"
@app.route('/index',methods=['GET','POST'])
def index():
print('视图函数x2')
return "视图函数x2"
if __name__ == '__main__':
app.run()errorhandler() 报错返回友好界面
@app.errorhandler(404)
def error404(args):
print(args)
return "您访问的页面不存在或者走丢了,,,,,,%s" % (args)