Flask----应用案例

需求

1. 创建app， 并使用配置文件配置mysql
2. 创建一个apps目录， 内部创建一个users目录，users目录下创建user蓝图，并注册到app
3. 为user蓝图配置路由；原生路由/info 返回info.html； restful api 路由/user/mobile 返回json数据。
4. 为app配置跨域（使用flask_cors）

案例代码

1. app.py

from flask import Flask
from flask import request, session, current_app, g
from flask_restful import Api, Resource
from flask_sqlalchemy import SQLAlchemy
from apps.users.user_app import user_app
from apps.users import models
from flask_cors import CORS

app = Flask(__name__)
# 配置app
app.config.from_pyfile("settings.py")
# 初始化数据库连接
db = SQLAlchemy(app)

# api接口， 蓝图中有自己的api对象
api = Api(app)

# 注册蓝图， 蓝图即扩展的应用，内部的路由也会放入url_map
app.register_blueprint(user_app)


if __name__ == "__main__":
    print("xxx:", app.url_map)
    # 配置跨域， 已测试
    CORS(app, supports_credentials=True, 
    origins=["http://localhost:8080",], 
    methods=["GET", "POST", "PUT", "DELETE", "OPTIONS"], 
    allow_headers=["x-requested-with", 'content-type', 'authorization', "author"],
    expose_headers="*")

    app.run(host="localhost", port=5000, debug=True)

2. user_app.py

from flask import request, render_template
from flask import Blueprint
from flask import jsonify

user_app = Blueprint("user", __name__, 
static_folder="static/users",  # 暂时没有办法访问静态文件
template_folder="templates/users")


@user_app.route("/info", methods=["GET", "POST"], endpoint="userInfo")
def userInfo():
    if request.method == "GET":
        return render_template("users/info.html")

    else:
        return "没有页面"


from flask_restful import Api, Resource
# 为蓝图实例化api对象，添加restful api
api = Api(user_app)

class UserResource(Resource):
    def get(self):
        res = jsonify({
    
            "code": 200,
            "msg": "1733532..."
        })
        return res

api.add_resource(UserResource, "/user/mobile")

3. manage.py

from app import app, db
from app import user_app
from flask_migrate import Migrate, MigrateCommand
from flask_script import Manager

migrate = Migrate(app, db)

manager = Manager(app)
manager.add_command("db", MigrateCommand)


if __name__ == "__main__":
    manager.run()

4. settings.py

# 使用pymysql
import pymysql
pymysql.install_as_MySQLdb()

# 配置数据库, 有如上代码，就不能mysql+pymysql
# SQLALCHEMY_DATABASE_URI = "mysql+pymysql://lauf:[email protected]:3306/"
SQLALCHEMY_DATABASE_URI = "mysql://lauf:[email protected]:3306/flask_625"
SQLALCHEMY_TRACK_MODIFICATIONS = False
SQLALCHEMY_ECHO = True

5. models.py