网络请求

在浏览器的URL中写入地址，点击回车访问时

浏览器会发送数据过去，本质上发送的是字符串

浏览器向后端发送请求时

GET请求【URL方法/表单提交】

现象：向后台传入数据，数据会拼接在URL上

搜索百度时：

https://cn.bing.com/search?q=百度form=ANNTH1&refig=0005c32289da4afe9c9a61288618e761

POST请求【表单提交】

现象：提交数据不在URL中，而是在请求体中

结合上篇内容做一个简单注册界面：

Python代码

from flask import Flask,render_template,request

app = Flask(__name__)

@app.route('/register',methods=['GET','POST'])#接受的请求可以是'GET'和'POST'
def register():

    return render_template('register.html')#返回我们写的register.html 界面
#下面两个选一个即可，注册界面一般是选取POST请求
@app.route('/do/re',methods=['GET'])
def do_re():
    #1.接收用户通过GET形式传过来的数据
    user = request.args.get("USER")
    pwd = request.args.get("PWD")
    sex = request.args.get("sex")
    hobby_list = request.args.getlist("hobby")
    city = request.args.get("city")
    skill_list = request.args.getlist("fav")
    more = request.args.get("beizhu")
    print(user,pwd,sex,hobby_list,city,skill_list,more)
    print(request.args)
    #2.返回结果
    return "注册成功"

@app.route('/post/re',methods=['POST','GET'])
def post_re():
    #1.接收用户通过POST形式传过来的数据
    user = request.form.get("USER")
    pwd = request.form.get("PWD")
    sex = request.form.get("sex")
    hobby_list = request.form.getlist("hobby")
    city = request.form.get("city")
    skill_list = request.form.getlist("fav")
    more = request.form.get("beizhu")
    print(user,pwd,sex,hobby_list,city,skill_list,more)
    print(request.form)
    #2.返回结果
    return "注册成功"

if __name__ == '__main__':
    app.run()

HTML代码

<form method="post" action="/post/re">的意思是只能接收post请求，之后跳转到python代码中的/post/re页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>用户注册</title>
</head>


<body>
<h1>用户注册</h1>
<form method="post" action="/post/re">
<div>
  用户名:<input type="text" name="USER"/>
</div>
<div>
  密码:<input type="password" name="PWD"/>
</div>
<div>
  选择性别:<input type="radio" name="sex" value="1">男<input type="radio" name="sex" value="2">女
</div>

<div>
  爱好:<input type="checkbox" name="hobby" value="10">羽毛球
      <input type="checkbox" name="hobby" value="11">听音乐
      <input type="checkbox" name="hobby" value="12">打游戏
      <input type="checkbox" name="hobby" value="13">篮球


</div>
<div>
  城市：
  <select name="city">
    <option value="bj">北京</option>
    <option value="sh">上海</option>
    <option value="sz">南京</option>
  </select>
</div>
<div>
  擅长领域：
  <select multiple name="fav">
    <option value="eat">吃饭</option>
    <option value="sleep">睡觉</option>
    <option value="Browse TikTok">刷抖音</option>
  </select>
</div>
<div>
  备注：<textarea rows="5" name="beizhu"></textarea>
</div>
<div>
  <input type="button" value="button提交">
  <input type="submit" value="submit提交">
</div>
</form>
</body>
</html>

以下是效果图：

填完信息后点击submit提交，会返回注册成功

pycharm里会返回填写的数据

值得一提的是，Python代码可以简写成这样：

from flask import Flask,render_template,request

app = Flask(__name__)

@app.route('/register',methods=['GET','POST'])
def register():#进行判断，当是get请求时，返回register.html界面
    if request.method == "GET":
        return render_template('register.html')
    else:
        user = request.args.get("USER")
        pwd = request.args.get("PWD")
        sex = request.args.get("sex")
        hobby_list = request.args.getlist("hobby")
        city = request.args.get("city")
        skill_list = request.args.getlist("fav")
        more = request.args.get("beizhu")
        print(user,pwd,sex,hobby_list,city,skill_list,more)
        print(request.args)
    #2.返回结果
    return "注册成功"



if __name__ == '__main__':
    app.run()