Django XML無法加載外部實體

Question

我收到一個名爲xml的參數，其中包含一個xml文檔。這就是我試圖...

from lxml.cssselect import CSSSelector, etree 
from lxml.etree import fromstring 

if request.POST: 

    parser = etree.XMLParser(ns_clean=True, recover=True) 
    h = etree.parse(request.POST['xml'], parser) 

    return HttpResponse(h) 

，但我得到這個錯誤：

[Fri Apr 05 09:50:13 2013] [error] IOError: Error reading file '<?xml version="1.0" encoding="ISO-8859-1"?> 
[Fri Apr 05 09:50:13 2013] [error] <delivery_receipt> 
[Fri Apr 05 09:50:13 2013] [error]  <version>1.1</version> 
[Fri Apr 05 09:50:13 2013] [error]  <msisdn>447777111111</msisdn> 
[Fri Apr 05 09:50:13 2013] [error]  <submission_ref>123456789</submission_ref> 
[Fri Apr 05 09:50:13 2013] [error]  <status>Delivered</status> 
[Fri Apr 05 09:50:13 2013] [error]  <reason>4</reason> 
[Fri Apr 05 09:50:13 2013] [error]  <gmt_timestamp>20130405095100</gmt_timestamp> 
[Fri Apr 05 09:50:13 2013] [error]  <retry>0</retry> 
[Fri Apr 05 09:50:13 2013] [error] </delivery_receipt>': failed to load external entity "<?xml version="1.0" encoding="ISO-8859-1"?> 
[Fri Apr 05 09:50:13 2013] [error] <delivery_receipt> 
[Fri Apr 05 09:50:13 2013] [error]  <version>1.1</version> 
[Fri Apr 05 09:50:13 2013] [error]  <msisdn>447777111111</msisdn> 
[Fri Apr 05 09:50:13 2013] [error]  <submission_ref>123456789</submission_ref> 

等

什麼想法？謝謝:)

Answer 1

request.POST默認返回unicode字符串。您遇到的下一個問題與您供應的編碼與您提供的文檔中聲明的編碼不匹配有關。

doc = request.POST.get('xml','') 
if not doc: 
    raise Exception() 
h = etree.XML(doc.encode('ascii'), parser) 

Answer 2

etree.parse需要文件名（或文件對象）。沒有名爲<all your xml>的文件。

您需要的XML提要解析器：

from lxml.cssselect import CSSSelector, etree 
from lxml.etree import fromstring 

if request.POST: 

    parser = etree.XMLParser(ns_clean=True, recover=True) 
    parser.feed(request.POST['xml']) 
    h = parser.close() 
    ... 

或者使用fromstring或XML功能。

h = fromstring(request.POST['xml'], parser=parser) 

或

h = etree.XML(request.POST['xml'], parser=parser) 

The lxml.etree tutorial