08flask the get and post requests.

1, get request.

　　Usage scenarios: access to information does not modify the data or resource server, use get.

　　Parameter passing: "?" Get request to pass parameters is in the URL, in the form specified by pairs.

2, post request.

　　Usage scenarios: an impact on the server, with the post.

　　Biography Reference: post is not in the URL, but send "form data" in the form to the server.

3, use:

app.route @ ( ' / ' ) 
DEF the hello_world (): 
    return the render_template ( ' index.html ' ) 

@ app.route ( ' / Search / ' ) 
DEF Search (): 
    return  ' ! Search ' 
corresponding to the index page of: 
<a href= "{{ url_for(" search " ,q =" hello ") }}"> Search keyword hello </a>

4, get get request keywords.

app.route @ ( ' / ' ) 
DEF hello_world (): 

    return render_template ( ' index.html ' ) 

# Get keyword submitted by the user 
@ app.route ( ' / Search / ' ) 
DEF Search (): 
    haha = Request. . args GET ( ' Q ' ) 
    Print (haha) 
    return  ' key submitted by the user is: S% ' % haha


 <a the href = " {{the url_for ( " Search " , Q = " Hello ") }}"> Search </a>

5, submit and obtain post request keywords.

G:\Flask\get_post\app.py

# post请求与获取提交的关键字
@app.route('/login/',methods=["POST","GET"])
def login():
    if request.method == "GET":
        return render_template('login.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        return "username:%s  /n  password:%s" %(username,password)

login.html
<form action="{{ url_for('login') }}" method="post">
    <input type="text" name="username"  placeholder="请输入用户名"><br>
    <input type="password" name="password"  placeholder="请输入密码"><br>
    <input type="submit" name="username" value="登录">

</form>