Calling Java Methods From XSL While XML Transformation

In my earlier article, I have shown you how to transform a XML from one format to another format.

Below, I will show you how to refer to a Java class from an XSL.

This is the java class which I want to refer to the xsl file. And getDemoProperties() is the method name which I will call from XSL. This is nothing but to get a properties flag value from the properties file.

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Properties;

public class DemoProperties {

                 Properties props;

               static String fName = "./DemoProperties.properties";

                   

                    public DemoProperties() {

                        props = new Properties();

                        try {

                                props.load(new FileInputStream(fName));

                        } catch (FileNotFoundException fnfEx){

                                                                fnfEx.printStackTrace();

                        }

                        catch (IOException ioEx){

                            ioEx.printStackTrace();

                        }

                    }

                   

                   

                   

     public String getDemoProperties(String propName) {

                        String retProp=new String("");

                        try {

                            retProp = props.getProperty(propName);

                        } catch(Exception e) {

                                                                e.printStackTrace();

                        }

                        return retProp;

                    }

}

DemoProperties.properties entry.

id=ID1

Input XML file:

       <?xml version="1.0" encoding="UTF-8" standalone="no" ?>

       <Order>

         <CustomerID>0123456789</CustomerID>

         <Title>Mr</Title>

         <FirstName>Vicky</FirstName>

         <Initial>VV</Initial>

         <Surname>Verma</Surname>

         <TelephoneNumber>0987654321</TelephoneNumber>

         <SubPremise>RakhsakNagar</SubPremise>

         <BuildingName>RakhsakNagar</BuildingName>

         <StreetNumber>207</StreetNumber>

         <StreetName>KharadiByPass</StreetName>

         <Locality>Kharadi</Locality>

         <PostTown>Pune</PostTown>

         <County>Pune</County>

         <Postcode>411014</Postcode>

         <OrderDate>20052009 15:18:11</OrderDate>

         <CADDate>05062009 15:23:54</CADDate>

         <OrderReference>022-123456789</OrderReference>

         <DealerChannel>Airtel Voice</DealerChannel>

         <InstallationType>Self</InstallationType>

         <AssetDescription>Airtel TV</AssetDescription>

         <Action>Add</Action>

         <ReplacementType>Active</ReplacementType>

         <CurrentDate>20090611T11:15:08</CurrentDate>

  </Order>

Sample XSL file:

       <?xml version="1.0" encoding="UTF-8" ?>

       <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:rf="DemoProperties">

         <xsl:strip-space elements="*" />

         <xsl:output method="xml" version="1.0" encoding="UTF-8" standalone="yes" indent="yes" />

       <xsl:template match="Order">

       <OrderForProduct xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

         <xsl:variable name="props" select="rf:new()" />

       <xsl:variable name="var">

         <xsl:value-of select="rf:getCPSProperties($props, 'id')" />

  </xsl:variable>

       <UniqueKey>

       <xsl:attribute name="Id">

         <xsl:value-of select="$var" />

  </xsl:attribute>

         </UniqueKey>

       <ProductsDetails>

         <Product Name="Airtel_TV" />

  </ProductsDetails>

       <PriorSubmission>

         <xsl:attribute name="UserName">AirtelUser</xsl:attribute>

       <xsl:attribute name="SubmitterRef">

         <xsl:value-of select="OrderReference" />

  </xsl:attribute>

  </PriorSubmission>

  </OrderForProduct>

  </xsl:template>

  </xsl:stylesheet>

XMLTransformation.java – Java class which actually does the transformation

import java.io.File;

import java.io.FileOutputStream;

import javax.xml.transform.stream.StreamResult;

import javax.xml.transform.stream.StreamSource;

import javax.xml.transform.OutputKeys;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.TransformerException;

import javax.xml.transform.TransformerConfigurationException;

public class XMLTransformation {

                XMLTransformation() {

                }

               

                private static void applyTransformAndSave() {

                                 try {

                                                                String sampleInputXML= "SampleInputXML.xml";

                            File sampleInputFile = new File(sampleInputXML);

                                        String sampleOutputXML = "SampleOutputFile.xml";

                            //Convert input file to output batch file according to the XSL

                                        TransformerFactory tFactory1 = TransformerFactory.newInstance();

                                                    Transformer transformer1;

                                                                transformer1 = tFactory1.newTransformer(new StreamSource("SampleXSL.xsl"));

                                                                transformer1.setOutputProperty(OutputKeys.INDENT, "yes");

                            transformer1.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

                                                    transformer1.transform(new StreamSource(sampleInputFile), new StreamResult(new FileOutputStream(sampleOutputXML)));

                                                } catch (TransformerConfigurationException tCEx){

                                                                tCEx.printStackTrace();

                        } catch (TransformerException tEx){

                                                                tEx.printStackTrace();

                                                } catch(Exception ex){

                                                                ex.printStackTrace();

                        }

    }

                public static void main(String args[]) {

                                                XMLTransformation xmlTransformation = new XMLTransformation();

                                                XMLTransformation.applyTransformAndSave();

                }

}

Output XML file:

       <?xml version="1.0" encoding="UTF-8" standalone="yes" ?>

       <OrderForProduct xmlns:rf="DemoProperties"        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

         <UniqueKey Id="ID1" />

       <ProductsDetails>

         <Product Name="Airtel_TV" />

  </ProductsDetails>

        <PriorSubmission UserName="AirtelUser" SubmitterRef="022-123456789" />

  </OrderForProduct>