Java HTML / XML How to - Convert an XML file to CSV file

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Question

We would like to know how to convert an XML file to CSV file.

Answer

import java.io.File;
/*w  w w .  j  a  v  a2s.c o m*/
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.w3c.dom.Document;

public class Main {

    public static void main(String args[]) throws Exception {
        File stylesheet = new File("style.xsl");
        File xmlSource = new File("data.xml");

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(xmlSource);

        StreamSource stylesource = new StreamSource(stylesheet);
        Transformer transformer = TransformerFactory.newInstance()
                .newTransformer(stylesource);
        Source source = new DOMSource(document);
        Result outputTarget = new StreamResult(new File("/tmp/x.csv"));
        transformer.transform(source, outputTarget);
    }
}

style.xsl

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" >
<xsl:output method="text" omit-xml-declaration="yes" indent="no"/>
<xsl:template match="/">
Host_Name,IP_address,OS,Load_avg_1min,Load_avg_5min,Load_avg_15min
<xsl:for-each select="//Host">
<xsl:value-of select="concat(Host,',',IP,',',OS,',',Load,',',Load,'&#xA;')"/>
</xsl:for-each>
</xsl:template>//  www . j a  v a2 s  .co m
</xsl:stylesheet>

output:

Host_Name,IP_address,OS,Load_avg_1min,Load_avg_5min,Load_avg_15min
srv001001,10.1.2.3,Windows1.3,2.5,1.2
srv001002,10.1.2.4,Linux1.4,2.5,1.2
srv001003,10.1.2.5,Linux3.3,1.6,1.8
srv001004,10.1.2.6,Linux2.3,4.5,4.2

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