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-8
from flask import Flask,render_template,request,redirect
import 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-8
file_dict = {}
# file => dict
def 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 => file
def 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.txt
tom:123
jack:123
user2:000
user1:pwd1
原文地址：https://www.cnblogs.com/reblue520/p/8467605.html
时间： 2024-10-10 20:20:38