Java XML parser to parse the XML file

[Anshul Chandra Saxena]

Hi

I have a requirement wherein i have to parse an XML file and generate a new XML file out of that.

My XML file looks like this

 <?xml version="1.0" encoding="UTF-8"?>
<request xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" build="wp6101_115_01" type="update" version="6.1.0.1" xsi:noNamespaceSchemaLocation="PortalConfig_6.1.0.xsd">
    <portal action="locate">
        <web-app action="update" active="true" domain="rel" objectid="1_083Q9FFKG80E20RA2Q00000000" removable="true" uid="com.ibm.wps.portlets.appearance.appearance_hsbc">
            <url>file://localhost/$user_install_root$/PortalServer/deployed/archive/com.ibm.wps.portlets.appearance.appearance_hsbc/XYZ.war</url>
            <context-root>/wps/XYZ</context-root>
            <display-name>PA_BDEPageAppearance</display-name>
            <access-control externalized="false" owner="undefined" private="false"/>
            <servlet action="update" active="true" domain="rel" name="Page Appearance.$appuid.com.ibm.wps.portlets.appearance.appearance.2" objectid="V_083Q9FFKG80E20RARR00000000" remote-cache-dynamic="false"/>
            <portlet-app action="update" active="true" domain="rel" name="Page Appearance" objectid="2_083Q9FFKG80E20RA9Q00000000" uid="appearance.2">
               <access-control externalized="false" owner="undefined" private="false">
                    <role-block actionset="Delegator" type="inheritance"/>
                    <role-block actionset="Manager" type="inheritance"/>
                    <role-block actionset="Editor" type="inheritance"/>
                    <role-block actionset="Privileged User" type="inheritance"/>
                    <role-block actionset="User" type="inheritance"/>
                    <role actionset="User" update="set"/>
                </access-control>
                <portlet action="update" active="true" defaultlocale="en" domain="rel" name="Page Appearance" objectid="3_083Q9FFKG80E20RA1S00000000" provided="false" servletref="V_083Q9FFKG80E20RARR00000000">
                   <access-control externalized="false" owner="undefined" private="false">
                        <role actionset="Editor" update="set"/>
                        <role actionset="Security Administrator" update="set"/>
                        <role actionset="User" update="set"/>
                    </access-control>
                </portlet>
            </portlet-app>
        </web-app>
      </portal>
    <status element="all" result="ok"/>
</request>   

My file has many entries like these. Now i have to parse this XML file and have to produce an output like this for all the entries:

   <?xml version="1.0" encoding="UTF-8" ?>
<request xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:noNamespaceSchemaLocation="PortalConfig_6.1.0.xsd" type="export">
	<web-app uid="com.hsbc.bde.portlets.resourceview.ResourceView">
		<portlet-app name="BDE Manage Roles Portlets" />
		<access-control externalized="false" owner="undefined" private="false">
                    <role-block actionset="Delegator" type="inheritance"/>
                    <role-block actionset="Manager" type="inheritance"/>
                    <role-block actionset="Editor" type="inheritance"/>
                    <role-block actionset="Privileged User" type="inheritance"/>
                    <role-block actionset="User" type="inheritance"/>
                    <role actionset="User" update="set"/>
                </access-control>
		<portlet name="BDE Resource View" />
		 <access-control externalized="false" owner="undefined" private="false">
                        <role actionset="Editor" update="set"/>
                        <role actionset="Security Administrator" update="set"/>
                        <role actionset="User" update="set"/>
          </access-control>
	</web-app>
</request> 

Can anyone please help me with this.

thanks
Anshul

[Paul Clapham]

If you want to transform one XML format into another XML format then I think using XSLT would be a good choice.

[Rob Spoor]

javax.xml.transform.TransformerFactory and javax.xml.transform.Transformer should be able to help you out:

TransformerFactory factory = TransformerFactory.newInstance();
Source xsltSource = new StreamSource(...); // apply your XSLT here, as a File or using a StringReader perhaps
Transformer transformer = factory.newTransformer(xsltSource);
Source xmlSource = new StreamSource(...); // your XML file / string; perhaps a SAXSource is also possible
Result xmlResult = new StreamResult(...); // your output XML, as a File or using a StringWriter perhaps
transformer.transform(xmlSource, xmlResult);