Cherrypy-接收JSON数据404，“缺少参数" [英] Cherrypy - reciving JSON data 404, 'Missing parameters'
问题描述
我正在使用Cherrypy Postgresql从头开始创建自己的网站.我是初学者使用Python和Javascript，但我非常热衷于学习这两种编程语言.
I'm making my own site from scratch using Cherrypy Postgresql. I am a beginner with Python and Javascript but I am very enthusiastic about learning those two programming languages.
我现在要实现的目标是fill up HTML form-> Send data using
What I am trying to achieve right now is to fill up HTML form -> Send data using JSON by AJAX -> Define Rights for a visitor -> and redirect to index after its all done.
几天来我一直在与这个错误作斗争，因为我无法在互联网上找到一个示例，说明如何使用JSON通过AJAX在python中发送数据
I am fighting with this error for days because I cannot find an example on the internet how to send data in python by AJAX using JSON
正如我所说的，我是一个初学者，所以请指出我正在编写的代码中的所有不良行为:)
As I said I am a beginner so point all bad behaviours in code I am making, please :)
Traceback (most recent call last):
File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\_cpdispatch.py", line 60, in __call__
return self.callable(*self.args, **self.kwargs)
TypeError: login() missing 1 required positional argument: 'dataString'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\_cprequest.py", line 670, in respond
response.body = self.handler()
File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\lib\encoding.py", line 221, in __call__
self.body = self.oldhandler(*args, **kwargs)
File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\_cpdispatch.py", line 66, in __call__
raise sys.exc_info()[1]
File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\_cpdispatch.py", line 64, in __call__
test_callable_spec(self.callable, self.args, self.kwargs)
File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\_cpdispatch.py", line 163, in test_callable_spec
raise cherrypy.HTTPError(404, message=message)
cherrypy._cperror.HTTPError: (404, 'Missing parameters: dataString')
Cherrypy引擎打印输出
Cherrypy engine printout
[12/Jun/2017:13:44:03] Testing database is disabled, deleting test users... skipping...
[12/Jun/2017:13:44:03] ====== INIT SQL ======
[12/Jun/2017:13:44:03] Connecting to PostgreSQL database...
[12/Jun/2017:13:44:03] Testing engine is enabled, adding record...
[12/Jun/2017:13:44:03] ====== INIT SRV ======
[12/Jun/2017:13:44:03] ENGINE Bus STARTING
CherryPy Checker:
The Application mounted at '' has an empty config.
[12/Jun/2017:13:44:03] ENGINE Started monitor thread 'Autoreloader'.
[12/Jun/2017:13:44:03] ENGINE Started monitor thread '_TimeoutMonitor'.
C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\process\servers.py:411: UserWarning: Unable to verify that the server is bound on 8080
warnings.warn(msg)
[12/Jun/2017:13:44:08] ENGINE Serving on http://0.0.0.0:8080
[12/Jun/2017:13:44:08] ENGINE Bus STARTED
Python登录方法
class Root(object):
exposed = True
@cherrypy.expose
# @cherrypy.tools.json_out()
@cherrypy.tools.json_in()
@cherrypy.tools.accept(media='application/json')
def login(self, dataString):
# cherrypy.request.method == "POST":
self.addHeader()
db = config()
conn = psycopg2.connect(**db)
cur = conn.cursor()
is_logged_in = None
bad_username = None
bad_password = None
json.load(dataString)
# input_json = cherrypy.request.json()
# dataString = input_json["dataString"]
# - Login
username_input = dataString[0]
if username_input == cur.execute("SELECT username FROM users WHERE username = %s;", (username_input)):
username_password = dataString[1]
if username_password == cur.execute("SELECT password FROM users WHERE password = %s;", (username_password)):
return is_logged_in
else:
return bad_password
else:
return bad_username
@cherrypy.expose
def index(self):
self.addHeader()
return "ok"
Javascript .js覆盖提交功能
$("#myForm").submit(function(){
var dataString = [];
dataString.login = $("#login").val();
dataString.password = $("#password").val();
$.ajax({
type: 'POST',
url: 'http://0.0.0.0:8080/login',
data: JSON.stringify(dataString),
contentType: 'application/json',
dataType: 'json',
success: function(response) {
console.log(response);
},
error: function(response) {
console.log(response);
}
});
});
HTML文件
<!DOCTYPE html>
<html>
<head>
<link href="style.css" rel="stylesheet">
<script src="http://code.jquery.com/jquery-2.0.3.min.js"></script>
<script src="example.js"></script>
</head>
<body>
<div class="login-page">
<div class="form">
<form action="/process_form/" method="post">
<!-- id="myForm" class="login-form"> -->
<input type="text" name="login" id="login" placeholder="login"/>
<input type="password" name="password" id="password" placeholder="password"/>
<button form="myForm" type="submit">Login</button>
<p class="message">Not registered? <a href="#">Create an account</a></p>
</form>
</div>
</div>
</body>
</html>
推荐答案
在login函数中将接收的AJAX数据不包含在参数dataString中(实际上，您将不会获得任何参数)但在cherrypy.request.json中.
The AJAX data you'll receive in in your login function is not contained in the parameter dataString (actually, you will not get any parameter) but in cherrypy.request.json.
因此，您应该按以下步骤更改登录功能:
Thus you should change your login function as follows:
@cherrypy.expose
@cherrypy.tools.json_in()
def login(self):
json_obj = cherrypy.request.json
...
请注意，您将收到基于AJAX参数而不是字符串的实际对象(字典/列表).
Note that you will receive an actual object (dict / list) based on the AJAX parameters, not a string.
另一个注意事项:cherrypy.request.json仅在您已经设置装饰器@cherrypy.tools.json_in()时才填充(如您已经做过的那样).
Another note: cherrypy.request.json is only filled if you've set the decorator @cherrypy.tools.json_in() (as you already did).
这篇关于Cherrypy-接收JSON数据404，“缺少参数"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
