Flask框架的学习指南之用户登录管理

#引用包
from flask.ext.login import LoginManager

#登陆管理
#声明login对象
login_manager = LoginManager()
#初始化绑定到应用
login_manager.init_app(app)

#声明默认视图函数为login，当我们进行@require_login时，如果没登陆会自动跳到该视图函数处理
login_manager.login_view = "login"

#当登陆成功后，该函数会自动从会话中存储的用户 ID 重新加载用户对象。它应该接受一个用户的 unicode ID 作为参数，并且返回相应的用户对象。
@login_manager.user_loader
def load_user(userid):
return User.query.get(int(userid))

from flask.ext.login import UserMixin

from blog2 import db

class User(db.Model, UserMixin):
  __tablename__ = 'b_user'
  id = db.Column(db.Integer,primary_key=True)
  username = db.Column(db.String(10),unique=True)
  password = db.Column(db.String(16))

  def __init__(self,username,password):
    self.username = username
    self.password = password
  def __repr__(self):
    return '<User %r>' % self.username

from flask.ext.login import login_required, login_user, logout_user

from blog2.model.User import User
from blog2.model.Category import Category
import os

from blog2 import app,db
from flask import request,render_template,flash,abort,url_for,redirect,session,Flask,g

@app.route('/')
@login_required
def show_entries():
  categorys = Category.query.all()
  return render_template('show_entries.html',entries=categorys)

@app.route('/add',methods=['POST'])
@login_required
def add_entry():
  #——————————————————————————————————————————————
  # 第一版登陆方式
  # if not session.get('logged_in'):
  #   abort(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':
    user = User.query.filter_by(username=request.form['username']).first()
    #——————————————————————————————————————————————————————————————————————————
    #第一版登陆方式
    # passwd = User.query.filter_by(password=request.form['password']).first()
    #
    # if user is None:
    #   error = 'Invalid username'
    # elif passwd is None:
    #   error = 'Invalid password'
    # else:
    #   session['logged_in'] = True
    #   flash('You were logged in')
    #   return redirect(url_for('show_entries'))
    #——————————————————————————————————————————————————————————————————————————

    login_user(user)
    flash('Logged in successfully.')
    return redirect(url_for('show_entries'))

  return render_template('login.html', error=error)

@app.route('/logout')
@login_required
def logout():
  #—————————————————————————————————————————————— 
  # 第一版登出方式
  # session.pop('logged_in', None)
  #—————————————————————————————————————————————— 
　　 logout_user()
  flash('You were logged out')
  return redirect(url_for('show_entries'))

{% if current_user.is_authenticated() %}
 Hi {{ current_user.name }}!
{% endif %}