這篇文章中我們將通過對HelloWorld的message進行操作，介紹一下如何使用flask進行Restful的CRUD。
概要信息
事前準備：flask
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$
代碼示例：HTTP謂詞（GET）
就像angular的插值表達式在模版中的作用一樣，在flask中也可以一樣使用，如果不熟悉angular的插值表達式的話也不要緊，看完下面的例子，基本上就會有一個大致的印象。
代碼示例
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$模版文件
liumiaocn:flask liumiao$ 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$代碼解析：app.route中指定了HTTP謂詞GET，缺省GET可以省略，如果一個方法對應多個謂詞動作，通過request.method來分離時，可以寫成methods=[‘GET','POST']的形式
執行&確認
liumiaocn:flask liumiao$ ./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
頁面確認
代碼示例：HTTP謂詞（DELETE|PUT|POST）
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$
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