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/flaskliumiaocn:flask liumiao$ flask --versionflask 1.0.2python 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$ |
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/pythonfrom flask import flaskfrom flask import render_templateapp = 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$ |
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$ |
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 |
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/pythonfrom flask import flaskfrom flask import render_templatefrom flask import requestimport jsonapp = 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$ |
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 |
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$ |
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$ |
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$ |
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轮子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
