【web】flask基础入门

• 1.基础使用

import json
from flask import Flask,request,jsonify,redirect

app = Flask(__name__)

@app.before_request     # 请求前置，每次访问前都会执行这个函数，一般没有返回值，如果有返回值，不会继续往下走
def auth():
    print(123)
    # return "无权访问"

@app.route('/home',methods=['GET','POST'])
def home():
    # URL中传递的参数
    print(request.args)
    print(request.args.get("name"))
    # print(request.args.getlist("name"))   # 多个参数值一样的时候，这样取

    # POST参数
    # print(request.form)   # form格式
    # print(request.json)   # json格式

    # print(request.headers)   # 请求头数据
    # print(request.cookies)   # cookies数据

    # print(request.files)   # 文件
    # return "home"

    # return json.dumps({"status":"true","data":123})
    # return jsonify({"status":"true","data":123})
    return redirect("http:www.baidu.com")

@app.route('/login')
def login():
    return "login"

if __name__ == '__main__':
    app.run(host='127.0.0.1',port=8009)

• 2.基于登录的token验证示例

import json
import os
import uuid

from flask import Flask,request,jsonify,redirect

app = Flask(__name__)

@app.before_request
def auth():
    if request.path == '/login':
        return

    token = request.args.get('token')
    name_list = os.listdir('token')
    for name in name_list:
        file_path = os.path.join(token,name)
        with open(file_path,"r",encoding='utf8') as f:
            uid = f.read().strip()
        if token == uid:
            return
    return jsonify({"status": False, "data": "无效token"})

@app.route('/home',methods=['GET','POST'])
def home():
    pass

@app.route('/login',methods=['POST'])
def login():
    mobile = request.args.get('mobile')
    pwd = request.args.get('pwd')
    # 登录数据，可以基于文件或者数据库
    with open('userinfo.json',mode='r',encoding='utf8') as f:
        user_dict = json.load(f)

    info = user_dict.get(mobile)
    print(type(pwd),pwd)
    print(info)
    print(type(info.get('pwd')),info.get('pwd'))
    if not info:
        return jsonify({"status": False, "data": "用户不存在"})
    if int(pwd) != info.get('pwd'):
        return jsonify({"status": False, "data": "密码错误"})
    uid = str(uuid.uuid4())
    with open(os.path.join("token",f'{mobile}.txt'),"w",encoding='utf8') as f:
        f.write(uid)
    return jsonify({"status": False, "data": uid})

if __name__ == '__main__':
    app.run(host='127.0.0.1',port=8009)