之前我们为了方便将几乎所有的内容都放进了app.py中，这就导致了，我们的代码乱七八糟的，导入包，视图，配置，模型类等全部在一个文件中，很不方便，于是乎，为了统一化管理，我们对该项目进行重构。

项目目录结构

目录结构：

|-1级目录
	|-二级目录
		|-三级目录
			|-四级目录

目录如下：

|-Sample
|	|-app
|	|	|-static
|	|	|	|-css
|	|	|	|-fonts
|	|	|	|-js
|	|	|	|-jquery.js
|	|	|	|-jquery.min.map
|	|	|-templates
|	|	|	|-includes
|	|	|	|-base.html
|	|	|	|-http-404.html
|	|	|	|-index.html
|	|	|	|-login.html
|	|	|	|-upload.html
|	|	|-__init__.py
|	|	|-config.txt
|	|  	|-forms.py
|	|	|-models.py
|	|	|-views.py
|	|-doc
|	|-test
|	|-venv
|	|-manager.py
|	|-requirements.txt

详细内容
init.py:

#  -*- coding:utf-8 -*-

from flask import Flask,render_template, redirect, flash
from werkzeug.routing import BaseConverter
from flask_bootstrap import Bootstrap
from flask_nav import Nav
from flask_nav.elements import *
from os import path
from flask_sqlalchemy import SQLAlchemy
from  .views import init_views
class RegexConver(BaseConverter):
    def __init__(self,url_map,*items):
        super(RegexConver,self).__init__(url_map)
        self.regex = items[0]

#获取绝对路径
basedir = path.abspath(path.dirname(__file__))
bootstrap = Bootstrap()
nav = Nav()
#创建数据库实体
db = SQLAlchemy()

def create_app():
    app = Flask(__name__)
    app.url_map.converters['regex'] = RegexConver
    app.config.from_pyfile('config')
    app.config['BOOTSTRAP_SERVE_LOCAL'] = True
    nav.register_element('top', Navbar(u"Flask入门",
                                       View(u'主页', 'index'),
                                       View(u'关于', 'about'),
                                       View(u'服务', 'services'),
                                       View(u'登录', 'login')
                                       ))
    bootstrap.init_app(app)
    nav.init_app(app)
    db.init_app(app)
    init_views(app)

    # 配置数据库
    app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + path.join(basedir, 'data.sqlite')
    # 打开提交
    app.config['SQLALCHEMY_COMMIT-OD-TEARDOWN'] = True
    app.config['SQLALCHEMY_TRACK_MODIFICATIONS']= True
    app.config['SQLALCHEMY_COMMIT_TEARDOWN '] = True

    return app

config.txt：
SECRET_KEY = 'hard to guess string'

forms.py：

# -*- coding:utf-8 -*-

#导入 form类
from  flask_wtf import Form
#导入字段类型
from wtforms import StringField, PasswordField,SubmitField
#导入校验器
from wtforms.validators import DataRequired

#定义表单类：LoginForm
class LoginForm(Form):
    username = StringField(label = u'用户名',validators=[DataRequired()])  #用户名，不能为空
    password = PasswordField(label = u'密码',validators=[DataRequired()])  #密码，不能为空
    submit = SubmitField(label = u'提交')

models.py：

#  -*- coding:utf-8 -*-

from . import db

#定义用户角色模型类
class Role(db.Model):
    __tablename__ = 'roles'
    id  = db.Column(db.Integer,primary_key=True)
    name = db.Column(db.String,nullable=True)
    #定义实体关系
    users = db.relationship('User',backref='roles')


#定义用户类
class User(db.Model):
    __tabelename__ = 'users'
    id  = db.Column(db.Integer,primary_key=True)
    name = db.Column(db.String,nullable=True)
    password = db.Column(db.String,nullable=True)
    #定义实体关系
    role_id = db.Column(db.Integer,db.ForeignKey('roles.id'))

views.py：

#  -*- coding:utf-8 -*-

from flask import render_template, redirect, url_for, flash,request
from  werkzeug.utils import secure_filename
from os import path

def init_views(app):
    @app.route('/')
    def index():
        return render_template('index.html',
                               title='index',
                               data1='<div><h1>welcome to ShangHai</h1></div>',
                               data2="<div><h1>welcome to BeiJing</h1></div>",
                               data3="## markdown content")

    @app.route('/services')
    def services():
        return 'service!'

    @app.route('/about')
    def about():
        return 'about!'

    # @app.errorhandler(404)
    # def page_not_found(e):
    #     return render_template('http-404.html'), 404
    #
    # @app.errorhandler(500)
    # def internal_server_error(e):
    #     return render_template('http-500.html'), 500

    '''The parameter length must be three characters'''

    @app.route('/user/<regex("[a-z]{3}"):username>')
    def user(username):
        return 'Username is %s' % username

    @app.route('/login', methods=["GET", "POST"])
    def login():
        # 导入表单类
        from app.forms import LoginForm
        # 实例化
        form = LoginForm()
        flash(u"登录成功")
        return render_template('login.html', title=u'登录', form=form)

    @app.route('/upload', methods=['GET', 'POST'])
    def upload():
        if request.method == 'POST':
            f = request.files['file']
            basepath = path.abspath(path.dirname(__file__))
            filename = secure_filename(f.filename)
            upload_path = path.join(basepath, 'static', 'uploads', filename)
            f.save(upload_path)
            return redirect(url_for('upload'))
        return render_template('upload.html')

    @app.template_filter('md')
    def markdown_to_html(txt):
        from markdown import markdown
        return markdown(txt)

    def read_md(filename):
        with open(filename) as md_file:
            content = reduce(lambda x, y: x + y, md_file.readlines())
        return content.decode('utf-8')

    @app.context_processor
    def inject_mothods():
        return dict(read_md=read_md)

至此，项目重构已经基本完成