XML Related Examples

Legacy Wiki Page

This page was migrated from the old MoinMoin-based wiki. Information may be outdated or no longer applicable. For current documentation, see python.org.

Jython examples using Java XML classes

DocumentationAndEducation

---

Examples related to Java XML classes using Jython will be here.

List of pages in this category:

• Something simple using dom4j

• Something else simple Jdom

• Others ?

• and of course Java SDK

Element tree

Here is a simple example. info on element tree is at http://effbot.org/zone/element-index.htm

Download element tree from http://effbot.org/downloads/

from  elementtree import ElementTree as ET

root = ET.Element("html")
head = ET.SubElement(root, "head")
title = ET.SubElement(head, "title")
title.text = "Page Title"
body = ET.SubElement(root, "body")
body.set("bgcolor", "#ffffff")
body.text = "Hello, World!"
tree = ET.ElementTree(root)
tree.write("page.xhtml")

import sys
tree.write(sys.stdout)

which produces:

<html><head><title>Page Title</title></head><body bgcolor="#ffffff">Hello, World!</body></html>

dom4j

This example requires http://www.dom4j.org/ the example below was tested with v1.6.1 download it and put it in you classpath.

This was posted to the Jython-users mailing list by Claude Falbriard Sep 14, 2007,

This simply prints out a xml tree. change line 39 to a valid xml filename.

import sys
from org.dom4j.io import SAXReader

def show_indent(level):
    return '    ' * level

def show_node(node, level):
    """Display one node in the DOM tree.
    """
    if node.getNodeType() == node.ELEMENT_NODE:
        name = node.getName()
        print '%sNode: %s' % (show_indent(level), name, )
        attrs = node.attributes()
        for attr in attrs:
            aName = attr.getQualifiedName()
            aValue = attr.getValue()
            print '  %sAttr -- %s: %s' % (show_indent(level), aName,aValue,)
    if node.getName() == 'RefNum':
        val = node.getText()
        print '%stitle: "%s"' % (show_indent(level+1), val, )
    elif node.getName() == 'link':
        val = node.getText()
        print '%slink    : "%s"' % (show_indent(level+1), val, )

    if node.getNodeType() == node.TEXT_NODE:
        print '**** text node'


def show_tree(node, level):
    show_node(node, level)
    level1 = level + 1
    children = node.elements()
    for child in children:
        show_tree(child, level1)

def test():
    print 'Version: %s' % (sys.version, )
    reader = SAXReader()
    doc = reader.read('example.xml')
    root = doc.getRootElement()
    show_tree(root, 0)

def main():
    test()

if __name__ == '__main__':
     main()

Using Jython and jaxen XPath

From: Frank Cohen Sent: Tuesday, June 03, 2008 10:34 PM

I needed to write a SOAP-based Web service to show off the SOAP testing capabilities for PushToTest TestMaker. I wanted to use XPath expressions to change the search expressions easily over time. I chose to use Jaxen and Xerces APIs. Figuring this out in Java wound up taking a long time - all those visits to change-compile-run-check land! So I broke out my trusty Jython (embedded in TestMaker) and wrote the following script.

I like example code. So I am posting this here to help anyone else that needs to do XPath expressions.

from java.io import ByteArrayInputStream
from org.apache.axis.utils import XMLUtils
from org.apache.axis.message import MessageElement
from java.lang import String
from org.jaxen.dom import DOMXPath

mystring = '''<change_price_response>
    <Inventory>
        <Product number="1000">
            <InStock>
                <part quantity="2" location="10"/>
                <part quantity="100" location="11"/>
                <part quantity="10" location="12"/>
            </InStock>
            <OnOrder>
                <order customer="100323" amount="2" ordernumber="988898"/>
                <order customer="100115" amount="1" ordernumber="988899"/>
                <order customer="100116" amount="10" ordernumber="988900"/>
            </OnOrder>
            <prices>
                <price amount="100" minquantity="1"/>
                <price amount="85" minquantity="10"/>
                <price amount="75" minquantity="20"/>
            </prices>
        </Product>
    </Inventory>
 </change_price_response>'''

soapElementAsString = String( mystring )
myis = ByteArrayInputStream( soapElementAsString.getBytes() )
respdoc = XMLUtils.newDocument( myis )

myrq = '''<change_price>
     <Product number="1000">
         <Operation type="AddStock" quantity="100" location="11"/>
     </Product>
     </change_price>'''

soapElementAsString = String( myrq )
myis2 = ByteArrayInputStream( soapElementAsString.getBytes() )
rqdoc = XMLUtils.newDocument( myis2 )
#rqme = MessageElement( rqdoc.getDocumentElement() )

xpath1 = DOMXPath( "//Product" )
product_number = int( xpath1.selectSingleNode( rqdoc ).getAttribute("number") )

print "fc1", xpath1.selectSingleNode( rqdoc ).getClass().getName()

xpath2 = DOMXPath( "//Operation[@location]" )
xpath2 = DOMXPath( "//Operation" )

print "fc", xpath2.selectSingleNode( rqdoc ).getClass().getName()

quantity = int( xpath2.selectSingleNode( rqdoc ).getAttribute("quantity") )
location = int( xpath2.selectSingleNode( rqdoc ).getAttribute("location") )

print product_number, quantity, location

xpath3 = DOMXPath( "//Product" )
xpath3.selectSingleNode( respdoc ).setAttribute( "number", str(product_number))

xpath4 = DOMXPath( '//part[@location=' + str( location ) + ']' )
xpath4.selectSingleNode( respdoc ).setAttribute( "quantity", str( quantity ))

print "done"