Hello World
傳說，每接觸一個新的編程語言或者工具，首先打印Hello World，會給你帶來好運。
# hello_world.py
from flask import Flask
app = Flask(__name__)
@app.route('/') # '/'代表訪問的是跟地址，默認是get請求
def index():
return 'Hello World'
if __name__ == '__main__':
app.run()
flask接收前端數據
效果
前端HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="x-ua-compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Title</title>
</head>
<body>
<h1>注冊頁面</h1>
<form action="http://127.0.0.1:5000/register/" method="post" enctype="multipart/form-data">
<p>
<label for="username">用戶名：</label> <!--label和input通過id綁定在一起-->
<input type="text" name="username" placeholder="請輸入用戶名" id="username">
</p> <!--placeholder 輸入框默認顯示的值-->
<p>
<label for="password">密碼：</label>
<input type="password" name="password" placeholder="請輸入密碼" id="password">
</p>
<p>
<label for="birthday">生日：</label>
<input type="date" name="birthday" id="birthday">
</p>
<p>
<label>性別：</label>
<input type="radio" name="gender" value="male" checked>男 <!--checked默認選中，簡寫了-->
<input type="radio" name="gender" value="female" >女
<input type="radio" name="gender" value="security">保密
</p>
<p>
<label>愛好：</label>
<input type="checkbox" name="hobby" value="read" checked>讀書
<input type="checkbox" name="hobby" value="outdoors">戶外
<input type="checkbox" name="hobby" value="movie">電影
<input type="checkbox" name="hobby" value="others">其他
</p>
<p>
<label for="homeland">家鄉：</label>
<select name="homeland" id="homeland" multiple > <!--multiple設置多選-->
<option value="AH" selected>安徽</option> <!--selected默認選中-->
<option value="HB" selected>湖北</option>
<option value="BJ">北京</option>
</select>
</p>
<p>
<label for="avatar">頭像：</label>
<input type="file" name="avatar" id="avatar">
</p>
<label for="self_info">自我介紹：</label>
<p>
<textarea name="self_info" id="self_info" cols="30" rows="10"></textarea>
</p>
<p>
<input type="submit" value="注冊">
</p>
</form>
</body>
</html>
后端flask
- 默認啟動端口是5000
- 通過參數
method設置register接收的請求方式 - 文本數據獲取方式：
request.forms - 文件數據獲取方式：
request.files
from flask import Flask, request
app = Flask(__name__)
@app.route('/register/', methods=['GET', 'POST'])
def register():
print(request.form) # 獲取form表單提交過來的非文件數據,類似字典
for item in request.form:
print(item)
avatar_obj = request.files.get('avatar') #獲取文件，類似字典
avatar_obj.save(avatar_obj.name) # 保存文件
return '注冊成功'
if __name__ == '__main__':
app.run()