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 importimport# 引入file_dict用户列表= Flask(__name__'/'defreturn render_template('login.html''/loginaction/', methods = ["POST","GET"def= ''if request.method ==
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

 


作者:郑子明
原文链接:https://blog.csdn.net/reblue520/article/details/80553373

  • 发表于 2019-10-11 16:43
  • 阅读 ( 30 )
  • 分类:flask

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