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Flash basic code

2022-04-22 01:21:00 【NLstudy33】
# 1. from flask package / modular   Introduction in flask class 
from flask import Flask,current_app,g,request,session,make_response
from flask import render_template,redirect,abort

app = Flask(__name__)
app.debug = True

# current_app Examples of current applications 
# g  Temporary storage object for processing requests , This variable is reset on every request 
@app.route('/index')
def index():
    print('app:',app)
    print('current_app',current_app) # current_app Examples of current applications 
    print(app == current_app) # True  It's just that the values are equal , Because we have only one app start-up , Not many 
    print(app is current_app) # False   Quotations are different 
    return 'index'

@app.route('/')
def helloworld():
    #  The view function 
    # return 'hello world,susede'
    #  visit '/' when , Redirect to '/test' page 
    # return redirect('/test')
    # abort(403) #  Triggering an exception , Unwanted return, Will call the following forbidden function 
    # ip  Intercept 
    ip_list = ['127.0.0.2']
    ip = request.remote_addr
    if ip in ip_list:
        abort(403)  #   Will call the following forbidden function 
    return 'hello,sucess,welcome'

#  Routing configuration uses decorators  @app.route(url,methods)
@app.route('/test')
def hellotest():
    #  The view function 
    return 'hello world,test0222, Test functions '

# URL Get parameters in view page
@app.route('/user/')
@app.route('/user/<page>')
def list_user(page=1):
    return ' Hello , I am the first {} Page user '.format(page)

#  Use API To configure  app.add_url_rule(url,url_name,view_name)
app.add_url_rule('/test-apimethod','apimethod',hellotest)

#  see url Routing rules 
print(app.url_map)


@app.route('/test/req')
def test_request():
    ''' Request message exercise '''
    get_args = request.args
    print('get_args',get_args)# get Request parameter acquisition 
    print(get_args.get('page',1)) #  No... Was passed in the request page value , Then you can set the default value 
    print(request.args.get('name'))
    #  Get the host where the server is located IP Address 
    headers = request.headers
    print(headers)
    print('host',headers.get('host'))

    #  Get the ip Address 
    user_ip = request.remote_addr
    print('user_ip',user_ip)
    print(request.remote_user)

    #  obtain user-agent, It can be used for reptiles 
    user_agent = request.headers.get('user-agent',None)
    print('User-Agent:','\n',user_agent)
    return 'request success'

@app.before_first_request
def first_request():
    """ After the server starts, before the first request arrives """
    print(' After the server starts, before the first request arrives ,first_request')

@app.before_request
def per_request():
    """ Before every request arrives """
    print(' Before every request arrives ,per_request')

# @app.after_request
# def after_request(reponse):
#     """ Execute after the request , If an exception occurs in the process, it will not be executed """
#     print(' Execute after the request , If an exception occurs in the process, it will not be executed ,after_request')
#     print(reponse.get_json())
#     return 'after_request'

@app.route('/test/resp')
def test_response():
    """ Test response """
    return ' Response test ,reponse success',405,{
        'user_name':'mark','user_id':'mark_id2'}

@app.route('/test/mkresp')
def test_mkresponse():
    ''' Use make_response Construct the response object '''
    mkresp = make_response(' This is a response object ',403,{
        'token':'abc123'
    })
    mkresp.headers['user_name'] = 'nick_li'
    mkresp.status_code = 200
    return mkresp

@app.route('/test/htmlresp')
def test_html_response():
    ''' Respond to html'''
    html = '<html><body><h1 style="color:red"> This is a HTML Response test </h1></body></html>'
    resp = make_response(html)
    return resp

@app.route('/test/html')
def test_html():
    ''' Read from file html'''
    html = render_template('test1.html')
    resp = make_response(html,400) #  Can refer to the previous use 
    return resp

@app.errorhandler(403)
def forbidden_page(err):
    """403 Error message ： You don't have access to the page """
    print(err)
    return ' You don't have access to the page , Please contact the administrator to open the permission '

# if __name__ == '__main__':
#     app.run()
版权声明
本文为[NLstudy33]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/04/202204220055101071.html
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