Request method
Flask default GET request
That is, if we need to GET requests a page, they need to POST requests so we need to override methods method:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="" method="post">
用户名:<input type="text">
密码:<input type="password">
<input type="submit" value="登录">
</form>
</body>
</html>
from flask import Flask,render_template
app = Flask(__name__)
@app.route('/login',methods=["POST","GET"]) # 重写methods方法
def login():
return render_template("login.html")
if __name__ == '__main__':
app.run("0.0.0.0",9876)
Other methods
Flask in the request provides us with many attributes, simply import request directly call the corresponding attribute you can see the effect directly
request.method
Flask in the request provides us with a method to save the property which is to ask the front way
from flask import Flask,render_template,request
app = Flask(__name__)
@app.route('/login',methods=["POST","GET"])
def login():
# 获取前端的请求的方式
print(request.method)
return render_template("login.html")
if __name__ == '__main__':
app.run("0.0.0.0",9876)
request.form
Data acquisition request
from flask import Flask,render_template,request
app = Flask(__name__)
@app.route('/login',methods=["POST","GET"])
def login():
if request.method == "GET":
return render_template("login.html")
if request.method == "POST":
# 获取form表单提交的数据
print(request.form) # ImmutableMultiDict([('username', 'henry'), ('password', '123456')])
return "200 ok"
if __name__ == '__main__':
app.run("0.0.0.0",9876)
Do login authentication by reqeust.form property
from flask import Flask,render_template,request
app = Flask(__name__)
@app.route('/login',methods=["POST","GET"])
def login():
if request.method == "GET":
return render_template("login.html")
if request.method == "POST":
# 获取form表单提交的数据
print(request.form) # ImmutableMultiDict([('username', 'henry'), ('password', '123456')])
username = request.form.get("username")
password = request.form.get("password")
if username == "henry" and password == "123456":
return "200 ok"
else:
return "404"
if __name__ == '__main__':
app.run("0.0.0.0",9876)
Note: ImmutableMultiDict types of data and python in our dictionary usage is the same
We can to_dict () method converts this data type to the above python in our dictionary as follows
from flask import Flask,render_template,request
app = Flask(__name__)
@app.route('/login',methods=["POST","GET"])
def login():
if request.method == "GET":
return render_template("login.html")
if request.method == "POST":
# 获取form表单提交的数据
print(request.form.to_dict()) # {'username': 'henry', 'password': '123456'}
username = request.form.get("username")
password = request.form.get("password")
if username == "henry" and password == "123456":
return "200 ok"
else:
return "404"
if __name__ == '__main__':
app.run("0.0.0.0",9876)
We take the value of the dictionary get method used to prevent the error
request.headers
Acquiring data request header
print(request.headers)
#Host: 192.168.16.42:9876 #Connection: keep-alive #Content-Length: 27 #Cache-Control: max-age=0 #Origin: http://192.168.16.42:9876 #Upgrade-Insecure-Requests: 1 #Content-Type: application/x-www-form-urlencoded #User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36 #Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3 #Referer: http://192.168.16.42:9876/login #Accept-Encoding: gzip, deflate #Accept-Language: zh-CN,zh;q=0.9
request.args
Get url parameters GET request
Print (request.args)
# ImmutableMultiDict ([( 'name', 'Henry'), ( 'Age', '18 is')])
# () method of converting into a dictionary by to_dict
print (request.args.to_dict ())
# { 'name': 'henry ', 'age': '18'}
request.files
upload files
Front page
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="" method="post" enctype="multipart/form-data">
用户名:<input type="text" name="username">
密码:<input type="password" name="password">
<input type="file" name="my_file">
<input type="submit" value="登录">
</form>
</body>
</html>
Back-end code
from flask import Flask,render_template,request
app = Flask(__name__)
@app.route('/login',methods=["POST","GET"])
def login():
if request.method == "GET":
return render_template("login.html")
if request.method == "POST":
username = request.form.get("username")
password = request.form.get("password")
if username == "henry" and password == "123456":
print(request.files) # ImmutableMultiDict([('my_file', <FileStorage: 'click点击事件.gif' ('image/gif')>)])
files = request.files.get("my_file") # files是FileStorage类型 注意:It is not a file handle
print (files.filename) # click click event .gif [file name]
return "200 ok"
files.save (files.filename) # FileStorage call the Save method to save the type of
the else:
return "404"
IF the __name__ == '__main__':
app.run ( "0.0.0.0", 9876)
|
1
|
fp
=
os.path.join(
"templates"
,files.filename)
# 通过os模块指定保存路径
|
request of other properties
print (request.url) # get the full access path print (request.path) # routing address / the Login Print (request.values) # parameters in the URL can be obtained can also obtain data FormData in print (request.args.get ( "id")) # get parameters in the URL of the print (request.args [ "id"] ) # get parameters in the URL conversion print (request.args.to_dict ()) # get parameters in the URL into a dictionary print (request .environ) # original information acquisition request print (request.base_url) # Get URL header does not include the parameter
Two special attributes
print (request.json) # request header Content-type: application / json serialization data request.json Print (request.data) # Content-type header of the request does not include Form or data