這篇文章中我們將通過對(duì)HelloWorld的message進(jìn)行操作，介紹一下如何使用flask進(jìn)行Restful的CRUD。
概要信息
事前準(zhǔn)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(dá)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(dá)式的話也不要緊，看完下面的例子，基本上就會(huì)有一個(gè)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$代碼解析：app.route中指定了HTTP謂詞GET，缺省GET可以省略，如果一個(gè)方法對(duì)應(yīng)多個(gè)謂詞動(dòng)作，通過request.method來分離時(shí)，可以寫成methods=[‘GET','POST']的形式
執(zhí)行&確認(rèn)
liumiaocn:flask liumiao$ ./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(yè)面確認(rèn)
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$執(zhí)行&結(jié)果確認(rèn)
執(zhí)行日志
liumiaocn:flask liumiao$ ./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
結(jié)果確認(rèn)：Delete
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$
可以看到執(zhí)行一次DELETE之后，兩條消息現(xiàn)在只剩下一條消息了，接下來使用POST添加再添加一條
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$再執(zhí)行一次PUT操作
liumiaocn:flask liumiao$ 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$小結(jié)
這篇文章中，使用最簡(jiǎn)單的方式在flask中模擬了一下如何進(jìn)行Restful的CRUD操作，當(dāng)然，實(shí)際的做法有很多種，在接下來的文章中還會(huì)介紹另外一種非常常見的輪子flask-restful.
總結(jié)
以上就是這篇文章的全部?jī)?nèi)容了，希望本文的內(nèi)容對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，謝謝大家對(duì)VEVB武林網(wǎng)的支持。
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