An XSLT style sheet can be applied to translate data from one XML grammar to another. Suppose that you receive stock quotes marked up in the following format:<?xml version="1.0"?> <investments> <item type="stock" exch="nyse" symbol="ZCXM" company="kartik corp" price="28.875"/> <item type="stock" exch="nasdaq" symbol="ZFFX" company="chandra inc" price="92.250"/> <item type="stock" exch="nasdaq" symbol="ZYSZ" company="mandal inc" price="20.313"/> </investments>You want to add this information to your portfolio of the following format.<?xml version="1.0"?> <portfolio> <stock exchange="nyse"> <name>kartik corp</name> <symbol>ZCXM</symbol> <price>28.875</price> </stock> <stock exchange="nasdaq"> <name>chandra inc</name> <symbol>ZFFX</symbol> <price>92.250</price> </stock> <stock exchange="nasdaq"> <name>mandal inc</name> <symbol>ZYSZ</symbol> <price>20.313</price> </stock> </portfolio>This amounts to translating from one XML schema to another. You can use XSLT to transform the<investments>data into the<portfolio>grammar. When you do this, your templates will contain output elements such as<stock>, instead of HTML elements. The following XSLT style sheet is an example.<?xml version="1.0"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:output method="xml" indent="yes"/> <xsl:template match="/"> <portfolio> <xsl:for-each select="investments/item[@type='stock']"> <stock> <xsl:attribute name="exchange"> <xsl:value-of select="@exch"/> </xsl:attribute> <name><xsl:value-of select="@company"/></name> <symbol><xsl:value-of select="@symbol"/></symbol> <price><xsl:value-of select="@price"/></price> </stock> </xsl:for-each> </portfolio> </xsl:template> </xsl:stylesheet>The translation can be performed in reverse with a similar style sheet, converting<portfolio>data to the<investments>grammar.<?xml version="1.0"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="xml" indent="yes"/> <xsl:template match="/"> <investments> <xsl:for-each select="portfolio/stock"> <item type="stock"> <xsl:attribute name="exch"><xsl:value-of select="@exchange"/></xsl:attribute> <xsl:attribute name="symbol"><xsl:value-of select="symbol"/></xsl:attribute> <xsl:attribute name="company"><xsl:value-of select="name"/></xsl:attribute> <xsl:attribute name="price"><xsl:value-of select="price"/></xsl:attribute> </item> </xsl:for-each> </investments> </xsl:template> </xsl:stylesheet>
package com.kartik.xml.to.xml;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
public class XmlToXmlConvert {
public static void main(String[] args)
{
String dataXML = convertXMLFileToString("C:\\Users\\kmandal\\Desktop\\xxx.xml");
Templates input =createTemplate();
XmlToXmlConvert st = new XmlToXmlConvert();
System.out.println(st.transform(dataXML, input));
/* String inputXSL = convertXMLFileToString("C:\\Users\\kmandal\\Desktop\\breakFirst.xslt");
String outputHTML = "C:\\Users\\kmandal\\Desktop\\break.html";
try{
st.transform(dataXML, inputXSL, outputHTML);
}catch (TransformerConfigurationException e){
System.err.println("TransformerConfigurationException");
// System.err.println(e);
}catch (TransformerException e){
System.err.println("TransformerException");
// System.err.println(e);
}*/
}
public void transform(String dataXML, String inputXSL, String outputHTML)throws TransformerConfigurationException,TransformerException
{
TransformerFactory factory = TransformerFactory.newInstance();
StreamSource xslStream = new StreamSource(inputXSL);
Transformer transformer = factory.newTransformer(xslStream);
StreamSource in = new StreamSource(dataXML);
StreamResult out = new StreamResult(outputHTML);
transformer.transform(in, out);
System.out.println("The generated HTML file is:" + outputHTML);
}
/**
* Transform xml using pfile to String
* @param xmlDataInput
* @param xsltTemplate
* @return
*/
public String transform(String xmlDataInput, Templates xsltTemplate) {
if ( xmlDataInput == null || xmlDataInput.trim().length() == 0 || xsltTemplate == null) {
return null;
}
StringWriter stringWriter = new StringWriter();
try {
Transformer transformer = xsltTemplate.newTransformer();
StreamSource source = new StreamSource(new StringReader(xmlDataInput));
javax.xml.transform.stream.StreamResult result = new javax.xml.transform.stream.StreamResult(
stringWriter);
transformer.transform(source, result);
} catch (TransformerConfigurationException tce) {
throw new RuntimeException("Error in XSLT rule transformation");
} catch (TransformerException te) {
throw new RuntimeException("Error in XSLT rule transformation");
}
return stringWriter.getBuffer().toString();
}
/**
*
* @return
*/
public static Templates createTemplate(){
TransformerFactory tFactory = TransformerFactory.newInstance();
// String xslt = getXslt();//this is read from properties file
String xslt = convertXMLFileToString("C:\\Users\\kmandal\\Desktop\\xxx.xslt");
if ( xslt != null ) {
StreamSource stylesource = new StreamSource(new StringReader(xslt));
try {
return tFactory.newTemplates(stylesource);
} catch (TransformerConfigurationException e) {
System.out.println("Error");
}
}
return null;
}
/**
*
* @param fileName
* @return
*/
public static String convertXMLFileToString(String fileName)
{
try{
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
InputStream inputStream = new FileInputStream(new File(fileName));
org.w3c.dom.Document doc = documentBuilderFactory.newDocumentBuilder().parse(inputStream);
StringWriter stw = new StringWriter();
Transformer serializer = TransformerFactory.newInstance().newTransformer();
serializer.transform(new DOMSource(doc), new StreamResult(stw));
return stw.toString();
}
catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
I am Kartik Chandra Mandal from Bangalore, India. Working as software engineer in Java technology. Have good knowledge of OWASP and CSRF in security for applications and it's implementation in Java technology.