Flask应用指南

#encoding: utf-8
from flask import Flask,render_template
app = Flask(__name__)

# 首页
@app.route('/')
def page1():
    # 注意这里使用了 render_template 函数，
    # 它会从 templates 文件夹中寻找对应的 HTML 文件
    return render_template('page1.html')

if __name__ == '__main__':
    app.run(debug=True,port=5000,host='0.0.0.0')

@app.route('/json')
def sysinfo():
    alist = {}
    alist['name'] = 'xxx'
    resp = make_response(jsonify(alist))
    resp.headers["Access-Control-Allow-Origin"] = "*"
    resp.headers["Content-Type"] = "application/json; charset=utf-8"
    return resp

@app.route('/user/<username>')
def user(username):
    a = request.args.get('a')
    b = request.args.get('b')
    return str(a)+','+str(b)+','+username

from sqlalchemy import Column, String, create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine, Table, Column, Integer, String, MetaData, ForeignKey, select,Date

DB_URL = "mysql+mysqlconnector://{}:{}@{}:{}/{}?charset=utf8".format(USERNAME,PASSWORD,HOST,PORT,DATABASE)
engine = create_engine(DB_URL)
DBSession = sessionmaker(bind=engine)
session = DBSession()
alist = session.execute('SELECT * FROM b_admin WHERE `state` = 1')
admins = [];
for h in alist:
    admin = {}
    admin['account'] = h.account
    admin['realname'] = h.realname
    admin['role'] = h.role
    admins.append(admin)
return admins

from concurrent.futures import ThreadPoolExecutor
import time
executor = ThreadPoolExecutor()
# 模拟耗时任务
def run_job(name):
    time.sleep(5)
    print('run_job complete', name,flush=True)

@app.route("/run")
def run_async():
    name = "this is a async"
    executor.submit(run_job, name=name)
    print("return now.",flush=True)
    return {'ret': 'ok'}

# 自定义 404 错误页面
@app.errorhandler(404)
def page_not_found(e):
    # 注意这里使用了 render_template 函数，
    # 它会从 templates 文件夹中寻找对应的 HTML 文件
    return render_template('404.html'), 404