这篇文章中我们将通过对helloworld的message进行操作，介绍一下如何使用flask进行restful的crud。
概要信息
事前准备：flask
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liumiaocn:flask liumiao$ which flask
/usr/local/bin/flask
liumiaocn:flask liumiao$ flask --version
flask 1.0.2
python 2.7.10 (default, jul 15 2017, 17:16:57)
[gcc 4.2.1 compatible apple llvm 9.0.0 (clang-900.0.31)]
liumiaocn:flask liumiao$
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代码示例：http谓词（get）
就像angular的插值表达式在模版中的作用一样，在flask中也可以一样使用，如果不熟悉angular的插值表达式的话也不要紧，看完下面的例子，基本上就会有一个大致的印象。
代码示例
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liumiaocn:flask liumiao$ cat flask_4.py
#!/usr/bin/python
from flask import flask
from flask import render_template
app = flask(__name__)
greeting_messages=["hello world", "hello python"]
@app.route("/api/messages",methods=['get'])
def get_messages():
return render_template("resttest.html",messages=greeting_messages)
if __name__ == "__main__":
app.debug=true
app.run(host='0.0.0.0',port=7000)
liumiaocn:flask liumiao$
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模版文件
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liumiaocn:flask liumiao$ cat templates/resttest.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>hello restful</title>
</head>
<body>
{% for message in messages %}
<h1>{{ message }}</h1>
{% endfor %}
</body>
</html>
liumiaocn:flask liumiao$
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代码解析：app.route中指定了http谓词get，缺省get可以省略，如果一个方法对应多个谓词动作，通过request.method来分离时，可以写成methods=[‘get','post']的形式
执行&确认
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liumiaocn:flask liumiao$ ./flask_4.py
* serving flask app "flask_4" (lazy loading)
* environment: production
warning: do not use the development server in a production environment.
use a production wsgi server instead.
* debug mode: on
* running on http://0.0.0.0:7000/ (press ctrl+c to quit)
* restarting with stat
* debugger is active!
* debugger pin: 131-533-062
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页面确认
代码示例：http谓词（delete|put|post）
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liumiaocn:flask liumiao$ cat flask_4.py
#!/usr/bin/python
from flask import flask
from flask import render_template
from flask import request
import json
app = flask(__name__)
greeting_messages=["hello world", "hello python"]
#http: get: retrieve operation
@app.route("/api/messages",methods=['get'])
def get_messages():
return render_template("resttest.html",messages=greeting_messages)
#http: delete: delete operation
@app.route("/api/messages/<messageid>",methods=['delete'])
def delete_message(messageid):
global greeting_messages
del greeting_messages[int(messageid)]
return render_template("resttest.html",messages=greeting_messages)
#http: put: update operation
#http: post: create operation
@app.route("/api/messages/<messageid>",methods=['put','post'])
def update_message(messageid):
global greeting_message
msg_info=json.loads(request.get_data(true,true,false))
#msg_info=request.args.get('message_info')
#msg_info=request.form.get('message_info','default value')
#msg_info=request.values.get('message_info','hello...')
greeting_messages.append("hello " + msg_info["message_info"])
return render_template("resttest.html",messages=greeting_messages)
if __name__ == "__main__":
app.debug=true
app.run(host='0.0.0.0',port=7000)
liumiaocn:flask liumiao$
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执行&结果确认
执行日志
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liumiaocn:flask liumiao$ ./flask_4.py
* serving flask app "flask_4" (lazy loading)
* environment: production
warning: do not use the development server in a production environment.
use a production wsgi server instead.
* debug mode: on
* running on http://0.0.0.0:7000/ (press ctrl+c to quit)
* restarting with stat
* debugger is active!
* debugger pin: 131-533-062
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结果确认：delete
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liumiaocn:flask liumiao$ curl -x delete http://localhost:7000/api/messages/1
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>hello restful</title>
</head>
<body>
<h1>hello world</h1>
</body>
</html>liumiaocn:flask liumiao$
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可以看到执行一次delete之后，两条消息现在只剩下一条消息了，接下来使用post添加再添加一条
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liumiaocn:flask liumiao$ curl -x post -d '{"message_info":"liumiaopost"}' http://localhost:7000/api/messages/3
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>hello restful</title>
</head>
<body>
<h1>hello world</h1>
<h1>hello liumiaopost</h1>
</body>
</html>liumiaocn:flask liumiao$
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再执行一次put操作
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liumiaocn:flask liumiao$ curl -x put -d '{"message_info":"liumiaoput"}' http://localhost:7000/api/messages/4
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>hello restful</title>
</head>
<body>
<h1>hello world</h1>
<h1>hello liumiaopost</h1>
<h1>hello liumiaoput</h1>
</body>
</html>liumiaocn:flask liumiao$
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小结
这篇文章中，使用最简单的方式在flask中模拟了一下如何进行restful的crud操作，当然，实际的做法有很多种，在接下来的文章中还会介绍另外一种非常常见的*flask-restful.
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，谢谢大家对服务器之家的支持。如果你想了解更多相关内容请查看下面相关链接
原文链接：https://blog.csdn.net/liumiaocn/article/details/80728020