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Flask利用session实现简单登录退出

发表于 更新于 分类于   |   字数统计: 860(字)   |   阅读时长: 5(分) Valine：

用的session来保存信息

在templates文件夹下添加html文件

layout.html

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<!doctype html>
<title>Flaskr</title>
<link rel=stylesheet type=text/css href="{{ url_for('static', filename='style.css') }}">
<div class=page>
  <h1>Flaskr</h1>
  <div class=metanav>
  {% if not session.logged_in %}
    <a href="{{ url_for('login') }}">log in</a>
  {% else %}
    <a href="{{ url_for('logout') }}">log out</a>
  {% endif %}
  </div>
  {% for message in get_flashed_messages() %}
    <div class=flash>{{ message }}</div>
  {% endfor %}
  {% block body %}{% endblock %}
</div>

login.html

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{% extends "layout.html" %}
{% block body %}
  <h2>Login</h2>
  {% if error %}<p class=error><strong>Error:</strong> {{ error }}{% endif %}
  <form action="{{ url_for('login') }}" method=post>
    <dl>
      <dt>Username:
      <dd><input type=text name=username>
      <dt>Password:
      <dd><input type=password name=password>
      <dd><input type=submit value=Login>
    </dl>
  </form>
{% endblock %}

show_entries.html

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{% extends "layout.html" %}
{% block body %}
  {% if session.logged_in %}
    <form action="{{ url_for('add_entry') }}" method='POST' class=add-entry>
      <dl>
        <dt>Title:
        <dd><input type=text size=30 name=title>
        <dt>Text:
        <dd><textarea name=text rows=5 cols=40></textarea>
        <dd><input type=submit value=Share>
      </dl>
    </form>
  {% endif %}
  <ul class=entries>
  {% for entry in entries %}
    <li><h2>{{ entry.title }}</h2>{{ entry.content|safe }}
  {% else %}
    <li><em>Unbelievable.  No entries here so far</em>
  {% endfor %}
  </ul>
{% endblock %}

在static下CSS文件

style.css

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body            { font-family: sans-serif; background: #eee; }
a, h1, h2       { color: #377BA8; }
h1, h2          { font-family: 'Georgia', serif; margin: 0; }
h1              { border-bottom: 2px solid #eee; }
h2              { font-size: 1.2em; }

.page           { margin: 2em auto; width: 35em; border: 5px solid #ccc;
                  padding: 0.8em; background: white; }
.entries        { list-style: none; margin: 0; padding: 0; }
.entries li     { margin: 0.8em 1.2em; }
.entries li h2  { margin-left: -1em; }
.add-entry      { font-size: 0.9em; border-bottom: 1px solid #ccc; }
.add-entry dl   { font-weight: bold; }
.metanav        { text-align: right; font-size: 0.8em; padding: 0.3em;
                  margin-bottom: 1em; background: #fafafa; }
.flash          { background: #CEE5F5; padding: 0.5em;
                  border: 1px solid #AACBE2; }
.error          { background: #F0D6D6; padding: 0.5em; }

在controller目录下新建blog_message.py文件

其实也就是接口文件= =

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#!/usr/bin/env python3
# _*_ coding: utf-8 _*_
# @Time  : 2020/3/13 11:32
# @Author: ChenZIDu
# @File  : blog_message.py

from blog.model.User import User
from blog.model.Category import Category
import os

from blog import app,db
from flask import request,render_template,flash,abort,url_for,redirect,session,Flask,g

@app.route('/')
def show_entries(): # 从数据库查询出文章的标题和正文。
    categorys = Category.query.all()
    return render_template('show_entries.html',entries=categorys)

@app.route('/add',methods=['POST'])
def add_entry():
    if not session.get('logged_in'):
        abort(401)      # 请求到此即中断，不会打印下面的语句，并返回HTTP状态码401
    title = request.form['title']
    content = request.form['text']
    category = Category(title, content)
    db.session.add(category)
    db.session.commit()
    flash('New entry was successfully posted')
    return redirect(url_for('show_entries'))

@app.route('/login',methods=['GET','POST'])
def login():
    error = None
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        user = User.query.filter_by(username=request.form['username']).first()
        passwd = User.query.filter_by(password = request.form['password']).first()

        if user is None:
            error = 'Invalid username'
        elif password is None:
            error = 'Invalid password'
        else:
            session['logged_in'] = True
            flash('You were logged in')
            return redirect(url_for('show_entries'))    #url_for() 来针对一个特定的函数构建一个 URL
    return render_template('login.html', error=error)

@app.route('/logout')
def logout():
    session.pop('logged_in', None)
    flash('You were logged out')
    return redirect(url_for('show_entries'))

在__init__.py文件中引入模块(要在app声明后=.=)

from blog.controller import blog_manage

然后就可以运行试试水了~

跟随茁壮的小草大佬