盤點(diǎn)Python網(wǎng)頁開發(fā)輕量級(jí)框架Flask知識(shí)（下篇）

@app.route('/get', methods = ['GET','POST'])def get():    if request.method == 'GET':        return '這是一個(gè)GET請(qǐng)求'    else:        return '這是一個(gè)其它請(qǐng)求'

@app.route('/post', methods = ['POST','GET'])def post():    if request.method == 'POST':        return '這是一個(gè)POST請(qǐng)求'    else:        return '這是一個(gè)其它請(qǐng)求'

https://www.kugou.com/yy/html/search.html#searchType=song&searchKeyWord=不謂俠

searchType=song&searchKeyWord=不謂俠

request.args['keyword']request.args.get('keyword')

request.form['keyword']request.form.get('keyword')

request.cookies['keyword']request.cookies.get('keyword')

request.headers['keyword']request.headers.get('keyword')

request.url：返回請(qǐng)求中的網(wǎng)頁地址
request.path：返回網(wǎng)頁存放地址
request.script_root:返回腳本根目錄
request.base_url:返回請(qǐng)求相對(duì)地址
request.url_root:返回請(qǐng)求網(wǎng)頁根目錄

request.data #返回一個(gè)字節(jié)類型的值

@app.route('/upload',methods=['GET','POST'])def upload():    if request.method == 'POST':        f = request.files['file']        filename = secure_filename(f.filename) #需要設(shè)置安全文件類型        #f.save(os.path.join('app/static',filename))兩種保存方式        f.save('app/static/'+str(filename))        return 'ok'    else:        return 'fail'

g：處理請(qǐng)求時(shí)用作臨時(shí)存儲(chǔ)的對(duì)象，每次請(qǐng)求都會(huì)重設(shè)這個(gè)變量
current_app： 當(dāng)前程序?qū)嵗?/span>

request：請(qǐng)求對(duì)象Session：存儲(chǔ)會(huì)話

@app.before_first_requestdef first():    print('我是第一運(yùn)行的')
@app.before_requestdef every():    print('我又來了')
@app.after_requestdef recv(res):    res.headers['Content-Type']='application/json' #更改響應(yīng)頭部數(shù)據(jù)    return res
@app.route('/start/<string:id>')def start(id):    g.use=request.cookies.get('user')    if id==g.use:        return request.url    else:        return request.cookies
ac= app.app_context() #應(yīng)用上下文管理器ac.push() #進(jìn)print(ac)a = current_appprint(a)ac.pop() #出print(ac)
with app.app_context() as f:    b= current_app    print(b)    print(f)

from flask import Flaskapp=Flask(__name__)@app.route('/kj')def df():    return 'hello world'@app.route('/index')def lk():    return 'efhsfj'

from flask import Flask,requestfrom demo1 import *@app.route('/')def login():    return request.urlif __name__ == '__main__':    app.run(debug=True)

from flask import Flaskfrom demo4 import rootfrom demo5 import adminapp=Flask(__name__) #應(yīng)用實(shí)例@app.route('/')def lo():    return '1111'app.register_blueprint(root,url_prefix='/') #藍(lán)圖對(duì)象和藍(lán)圖掛載點(diǎn)app.register_blueprint(root,url_prefix='/root') app.register_blueprint(root,url_prefix='/admin') app.register_blueprint(admin,url_prefix='/')app.register_blueprint(admin,url_prefix='/admin') app.register_blueprint(admin,url_prefix='/root') if __name__ == '__main__':    app.run(debug=True)

from flask import Flask,Blueprintroot=Blueprint('root',__name__) #藍(lán)圖名稱和藍(lán)圖所在的模塊@root.route('/login')def b1():    return 'hello'@root.route('/index')def b2():    return 'world'

from flask import Flask,Blueprintadmin=Blueprint('admin',__name__) #藍(lán)圖名稱和藍(lán)圖所在的模塊@admin.route('/ff')def bw():    return 'ergdsfg'@admin.route('/gg')def be():    return 'gtergsdf'

from flask.views import Viewdef ff():    return 'ok'class st(View):    def dispatch_request(self): #必須實(shí)現(xiàn)這個(gè)方法        return "任性的90后boy"# 類視圖通過add_url_rule方法和url做映射app.add_url_rule(rule='/ff',view_func=st.as_view('tt'))

from flask.views import MethodViewdef gg():    return 'ok'class login(MethodView):    #當(dāng)客戶端通過get方法進(jìn)行訪問的時(shí)候執(zhí)行的函數(shù)    def get(self):        return 'get'    # 當(dāng)客戶端通過post方法進(jìn)行訪問的時(shí)候執(zhí)行的函數(shù)    def post(self):        email = request.form.get("user")        password = request.form.get("pass")        if user== 'gffsadff' and pass== '4fsaferwf':            return "登錄成功"        else:            return "登陸失敗"
# 通過add_url_rule添加類視圖和url的映射，并且在as_view方法中指定該url的名稱，方便url_for函數(shù)調(diào)用app.add_url_rule('/gg',view_func=login.as_view('lg'))

with app.test_request_context():    print('我是第一個(gè)運(yùn)行的')

@app.route('/<path:url>',endpoint='name1') #路由別名為name1def first_flask(url):     print(url_for('name1',url=url)) #如果設(shè)置了url參數(shù)，url_for（別名,加參數(shù)）    return redirect(url_for('get'))#重定向

def fl():    return 'ok3' #app.add_url_rule(rule=訪問的url,endpoint=路由別名,view_func=視圖名稱,methods=請(qǐng)求方法)app.add_url_rule(rule='/kj',endpoint='name2',view_func=fl,methods=['GET'])

from flask import Flaskimport viewsapp = Flask(__name__)@app.route('/')def ll():    return 'index'
@app.route('/use/<usename>')def use(usename):    return usename

def ll():    return 'index'def use(usename):    return usename

from myapp import viewsfrom flask import Flaskapp=Flask(__name__)app.add_url_rule('/', view_func=views.ll)app.add_url_rule('/use/<usename>', view_func=views.use)if __name__ == '__main__':    app.run(debug=True)

200：請(qǐng)求正確404： 路徑錯(cuò)誤405： 請(qǐng)求方式錯(cuò)誤500： 服務(wù)器錯(cuò)誤302： 重定向301 ：永久重定向