- 编写要求登录的装饰器
from functools import wraps
def loginFirst(func): #参数是函数
@wraps(func)
def wrapper(*args, ** kwargs): #定义个函数将其返回
#要求登录
return func(*args, ** kwargs)
return wrapper #返回一个函数
- 应用装饰器，要求在发布前进行登录，登录后可发布。
@app.route('/question/',methods=['GET','POST']) @loginFirst def question():
- 建立发布内容的对象关系映射。
class Question(db.Model):
- 完成发布函数。
保存到数据库。
重定向到首页。
from flask import Flask,render_template,request,redirect,url_for,sessionfrom flask_sqlalchemy import SQLAlchemyimport configfrom functools import wrapsfrom datetime import datetimeapp = Flask(__name__)app.config.from_object(config)db=SQLAlchemy(app)class User(db.Model): __tablename__ = 'User' id = db.Column(db.Integer,primary_key=True,autoincrement=True) username = db.Column(db.String(20),nullable=False) password = db.Column(db.String(20),nullable=False) userphone = db.Column(db.String(20),nullable=False)class Question(db.Model): __tablename__ = 'question' id = db.Column(db.Integer, primary_key=True, autoincrement=True) title = db.Column(db.String(100), nullable=False) detail = db.Column(db.Text, nullable=False) creat_time = db.Column(db.DateTime, default=datetime.now) author_id = db.Column(db.Integer, db.ForeignKey('User.id')) author = db.relationship('User', backref=db.backref('question'))#db.create_all()@app.route('/')def zhuye(): return render_template('zhuye.html')@app.route('/denglu/',methods=['GET','POST'])def denglu(): if request.method == 'GET': return render_template('denglu.html') else: username = request.form.get('username') password = request.form.get('password') user = User.query.filter(User.username == username).first() if user: if user.password == password: session['user'] = username session.permanent = True return redirect(url_for('zhuye')) else: return '密码错误！' else: return '不存在该用户名！'@app.route('/zhuce/',methods=['GET','POST'])def zhuce(): if request.method == 'GET': return render_template('zhuce.html') else: username = request.form.get('username') password = request.form.get('password') userphone = request.form.get('userphone') user = User.query.filter(User.username == username).first() if user: return 'username existed.' else: user1 = User(username=username, password=password, userphone=userphone,) db.session.add(user1) db.session.commit() return redirect(url_for('denglu'))def loginFirst(func): @wraps(func) def wrapper(*args, **kwargs): if session.get('user'): return func(*args, **kwargs) else: return redirect(url_for('denglu')) return wrapper@app.route('/question/',methods=['GET','POST'])@loginFirstdef question(): if request.method == 'GET': return render_template('question.html') else: title = request.form.get('title') detail = request.form.get('detail') author_id = User.query.filter(User.username == session.get('user')).first().id question = Question(title=title, detail=detail, author_id=author_id) db.session.add(question) db.session.commit() return redirect(url_for('zhuye'))@app.context_processordef mycontext(): username=session.get('user') if username: return {'username':username} else: return {}@app.route('/logout/')def logout(): session.clear() return redirect(url_for('zhuye'))if __name__ == '__main__': app.run(debug=True) {% extends'base.html' %}{% block title %} Question{% endblock %}{% block head %} {% endblock %}{% block main %} 发布问答
{% endblock %} 
