Web Service系列之常见问题

原文链接: Web Service系列之常见问题

问题: Server raised fault: ‘org.xml.sax.SAXException: No deserializer for {http://www.w3.org/2001/XMLSchema}anyType’

CSDN网友回复:

原因就是服务器端将对象序列化为SOAP消息, 到了客户端后进行反序列化, 这个时候在SOAP消息中的某个元素是anyType

类型, 但是和客户端在命名空间中的注册属性无法匹配, 导致不能反序列化, 大部分是命名空间的问题

stackoverflow网友回复:

http://stackoverflow.com/questions/13593950/suds-write-request-missing-datatype

I managed to solve it, using the answer from Adding xsi:type and envelope namespace when using SUDS ( http://stackoverflow.com/a/10977734/696768 )

I am not sure this is the only possible solution, and to me it seems more of a hack than anything else, however it will work fine for my current scenario.

The solution i used, is making a plugin for the client, looking for the particular element that i need to be xsi:type=”xsd:int”, then adding these attributes to those elements.

The code i ended up using for reference (from the aforementioned stackoverflow question with minor adjustments):

from suds.plugin import MessagePlugin
from suds.sax.attribute import Attribute

class SoapFixer(MessagePlugin):
def marshalled(self, context):
# Alter the envelope so that the xsd namespace is allowed
context.envelope.nsprefixes['xsd'] = 'http://www.w3.org/2001/XMLSchema'
# Go through every node in the document and apply the fix function to patch up incompatible XML.
context.envelope.walk(self.fix_any_type_string)
def fix_any_type_string(self, element):
"""Used as a filter function with walk in order to fix errors.
If the element has a certain name, give it a xsi:type=xsd:int. Note that the nsprefix xsd must also
be added in to make this work."""

# Fix elements which have these names
fix_names = ['Value', 'anotherelementname']
if element.name in fix_names:
element.attributes.append(Attribute('xsi:type', 'xsd:int'))

plugin=SoapFixer()

Then I added plugins=[plugin] to the client ctor.

Example:

client = suds.client.Client("http://127.0.0.1:8099/TagValueWriteService?wsdl",plugins=[plugin])

补充:

https://wiki.python.org/moin/WebServices

Web Service: JSON-RPC JSON-WSP SOAP SOAPjr XML-RPC XMPP