通过flask实现web页面简单的增删改查# 1.后台程序falsk_web01.py#coding:utf-8from flask import Flask,render_template,request,redirectimport fileutils# 引入file_dict用户列表fileutils.file_read()app = Flask(__name__)@app.route(‘/‘)def index(): ???return render_template(‘login.html‘)@app.route(‘/loginaction/‘, methods = ["POST","GET"])def login(): ???error_msg = ‘‘ ???????if request.method == ‘GET‘: ???????username = request.args.get(‘username‘) ???????password = request.args.get(‘password‘) ???else: ???????username = request.form.get(‘username‘) ???????password = request.form.get(‘password‘) ???print(‘username:%s,password:%s‘ % (username,password)) ???if username and password: ???????if username == "admin" and password == "admin": ???????????return redirect(‘/list‘) ???????else: ???????????error_msg = "username or password is wrong" ???else: ???????error_msg = ‘need username and password‘ ???return render_template(‘login.html‘, error_msg = error_msg)@app.route(‘/list/‘)def userlist(): ???userlist = fileutils.file_read().items() ???print(‘userlist:%s‘ % userlist) ???return render_template(‘list.html‘, userlist = userlist)@app.route(‘/update/‘)def update(): ???username = request.args.get(‘username‘) ???password = fileutils.file_read().get(username) ???user = [username, password] ???print(‘update:%s‘ % user) ???return render_template(‘update.html‘, user = user)@app.route(‘/updateaction/‘, methods = [‘POST‘])def updateaction(): ???params = request.args if request.method == ‘GET‘ else request.form ???????username = params.get(‘username‘) ???password = params.get(‘password‘) ???fileutils.file_dict[username] = password ???fileutils.file_write() ???return redirect(‘/list/‘)@app.route(‘/add/‘)def add(): ???return render_template(‘add.html‘)@app.route(‘/addaction/‘, methods = [‘POST‘])def addaction(): ???params = request.args if request.method == ‘GET‘ else request.form ???username = params.get(‘username‘) ???password = params.get(‘password‘) ???if username in fileutils.file_dict: ???????return redirect(‘/list/‘) ???else: ???????fileutils.file_dict[username] = password ???????fileutils.file_write() ???????return redirect(‘/list/‘)@app.route(‘/delete/‘)def delete(): ???username = request.args.get(‘username‘) ???fileutils.file_dict.pop(username) ???fileutils.file_write() ???return redirect(‘/list/‘)if __name__ == "__main__": ???app.run(host = ‘0.0.0.0‘, debug = True)# 2.工具类fileutils.py# coding:utf-8file_dict = {}# file => dictdef file_read(): ???????with open(‘user.txt‘) as f: ???????for line in f.read().split(‘\n‘): ???????????if line: ???????????????tmp = line.split(‘:‘) ???????????????file_dict[tmp[0]] = tmp[1] ???return file_dict# ditc => filedef file_write(): ???file_arr = [] ???for user,pwd in file_dict.items(): ???????file_arr.append(‘%s:%s‘ % (user, pwd)) ???print(file_arr) ???with open(‘user.txt‘, ‘w‘) as f: ???????f.write(‘\n‘.join(file_arr))if __name__ == "__main__": ???print(file_read()) ???file_write()# 3.模板文件templates中的登陆、列表、增删改查页面①用户登录页面login.html<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>login</title></head><body><p style="color:red"> ???{{error_msg}}</p> ???<form action=‘/loginaction/‘ method="post"> ???????username: <input type="text" name="username" /> ???????password: <input type="text" name="password" /> ???????<input type="submit" value="login"> ???</form></body></html>②更新用户页面update.html<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>login</title></head><body> ???<form action=‘/updateaction/‘ method="post"> ???????username:{{user[0]}} <input type="hidden" name="username" value="{{user[0]}}" /> ???????password: <input type="text" name="password" value="{{user[1]}}" /> ???????<input type="submit" value="update"> ???</form></body></html>③添加用户页面add.html<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>login</title></head><body> ???<form action=‘/addaction/‘ method="post"> ???????username: <input type="text" name="username" /> ???????password: <input type="text" name="password" /> ???????<input type="submit" value="add"> ???</form></body></html>④列表页面list.html<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>login</title></head><body><table border="1" cellpadding="0" cellspacing="0"> ???<tr> ???????<td>user</td> ???????<td>pwd</td> ???????<td>action</td> ???</tr> ???{% for user in userlist %} ???<tr> ???????<td>{{user[0]}}</td> ???????<td>{{user[1]}}</td> ???????<td> ???????????<a href="/delete/?username={{user[0]}}">delete</a> ???????????<a href="/update/?username={{user[0]}}">update</a> ???????????<a href="/add/">add</a> ???????</td> ???</tr> ???{% endfor %}</table></body></html>4.用户信息文件user.txttom:123jack:123user2:000user1:pwd1通过flask实现web页面简单的增删改查
原文地址：https://www.cnblogs.com/reblue520/p/8467605.html