Flask服务入门案例

系统管理员 2021-09-19 10:28 299阅读 0赞

**阅读目录**

*  [安装][Link 1]
 *  [入门例子][Link 2]
 *  [请求][Link 3]
 *  [错误案例][Link 4]
 *  [变量规则][Link 5]
 *  [输出PUT、POST请求中的参数][PUT_POST]

[回到顶部][Link 6]

### 安装 ###

pip install Flask

[回到顶部][Link 6]

### 入门例子 ###

![复制代码][copycode.gif]

from flask import Flask
    app = Flask(__name__)
    
    @app.route('/hello.world')
    def check():
        return 'hello world!'
    
    
    if __name__ == '__main__':
        app.run(debug=False, host='0.0.0.0', port=80)   #指定了费debug模式，外部可访问的服务器，端口

![复制代码][copycode.gif]

[回到顶部][Link 6]

### 请求 ###

<table style="border:1px solid #C0C0C0;border-collapse:collapse;background:none;line-height:1.1em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:12px;"> 
 <tbody style="background:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
  <tr style="background:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
   <td style="border:1px solid #C0C0C0;border-collapse:collapse;background:none;line-height:1.1em;vertical-align:baseline;width:35px;color:rgb(175,175,175);"> 
    <div style="background:rgb(244,244,244) none;border-width:0px 2px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.8em;text-align:right;vertical-align:baseline;">
      1 
    </div> 
    <div style="background-image:none;border-width:0px 2px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.8em;text-align:right;vertical-align:baseline;">
      2 
    </div> </td> 
   <td style="border:1px solid #C0C0C0;border-collapse:collapse;background:none;line-height:1.1em;vertical-align:baseline;"> 
    <div style="background:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
     <div style="background:rgb(244,244,244) none;border:0px;line-height:1.8em;vertical-align:baseline;"> 
      <code style="background:none;border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);">$curl http:</code> 
      <code style="background:none;border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,130,0);">//10.177.80.30:80/hello.world</code> 
     </div> 
     <div style="background-image:none;border:0px;line-height:1.8em;vertical-align:baseline;"> 
      <code style="background:none;border:0px;line-height:1.8em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;color:rgb(0,0,0);">hello world!</code> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

[回到顶部][Link 6]

### 错误案例 ###

![复制代码][copycode.gif]

from flask import Flask
    
    app = Flask(__name__)
    
    @app.route('/hello.world')
    def check():
        return 200
    
    
    if __name__ == '__main__':
        app.run(debug=False, host='0.0.0.0', port=80)

![复制代码][copycode.gif]

注：返回值不可为整数

[回到顶部][Link 6]

### 变量规则 ###

![复制代码][copycode.gif]

from flask import Flask
    app = Flask(__name__)
    
    @app.route('/h/<user>')
    def check(user):
        return "hello world: %s" % user
    
    
    if __name__ == '__main__':
        app.run(debug=False, host='0.0.0.0', port=801)

![复制代码][copycode.gif]

请求：

$curl http://10.125.8.116:801/h/lalala
    hello world: lalala

[回到顶部][Link 6]

### 输出PUT、POST请求中的参数 ###

![复制代码][copycode.gif]

from flask import Flask
    from flask import request
    import os
    app = Flask(__name__)
    
    @app.route('/testcase', methods=['GET', 'POST'])
    def test():
        if request.method == 'POST':
            msg = request.form.get('msg')
            return 'post msg:', msg
        else:
            msg =  request.args.get('msg')
            return 'put msg:', msg
    
    
    if __name__ == '__main__':
        app.run(debug=False, host='0.0.0.0', port=8099)

![复制代码][copycode.gif]

参考：http://docs.jinkan.org/docs/flask/quickstart.html

本文转自jihite博客园博客，原文链接：http://www.cnblogs.com/kaituorensheng/p/5088978.html，如需转载请自行联系原作者

[Link 1]: http://www.cnblogs.com/kaituorensheng/p/5088978.html#_label0
[Link 2]: http://www.cnblogs.com/kaituorensheng/p/5088978.html#_label1
[Link 3]: http://www.cnblogs.com/kaituorensheng/p/5088978.html#_label2
[Link 4]: http://www.cnblogs.com/kaituorensheng/p/5088978.html#_label3
[Link 5]: http://www.cnblogs.com/kaituorensheng/p/5088978.html#_label4
[PUT_POST]: http://www.cnblogs.com/kaituorensheng/p/5088978.html#_label5
[Link 6]: http://www.cnblogs.com/kaituorensheng/p/5088978.html#_labelTop
[copycode.gif]: /images/20210726/7942da6f24694ecea14ce05cd123cda1.png