Java XML Format prettyXml(final String xml)

Description

pretty Xml

License

Open Source License

Declaration

public static String prettyXml(final String xml) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

public class Main {
    public static String prettyXml(final String xml) {

        try {// w  w  w  . jav  a 2s.  co m
            final Document document = parseString(xml);
            cleanDocument(document);

            return toString(document, true, false);
        } catch (final Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static Document parseString(final String xml) {
        try {
            return parseStream(new ByteArrayInputStream(xml.getBytes("utf-8")));
        } catch (final Exception e) {
            throw new RuntimeException(e);
        }
    }

    private static void cleanDocument(final Document document) throws XPathExpressionException {
        document.getDocumentElement().normalize();
        removeEmptyTextNodes(document);
    }

    private static String toString(final Document document, final boolean indent, final boolean omitXmlDeclaration)
            throws TransformerConfigurationException, TransformerFactoryConfigurationError, TransformerException {
        final Transformer transformer = TransformerFactory.newInstance().newTransformer();
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, omitXmlDeclaration ? "yes" : "no");
        transformer.setOutputProperty(OutputKeys.INDENT, indent ? "yes" : "no");
        transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");

        final StringWriter stringWriter = new StringWriter();
        final StreamResult streamResult = new StreamResult(stringWriter);

        transformer.transform(new DOMSource(document), streamResult);

        return stringWriter.toString();
    }

    public static Document parseStream(final InputStream xmlis) {
        try {
            return DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new InputSource(xmlis));
        } catch (final Exception e) {
            throw new RuntimeException(e);
        }
    }

    private static void removeEmptyTextNodes(final Document document) throws XPathExpressionException {
        final XPath xPath = XPathFactory.newInstance().newXPath();
        final NodeList nodeList = (NodeList) xPath.evaluate("//text()[normalize-space()='']", document,
                XPathConstants.NODESET);

        for (int i = 0; i < nodeList.getLength(); ++i) {
            final Node node = nodeList.item(i);
            node.getParentNode().removeChild(node);
        }
    }
}

Related

1. prettyPrintToString(String xml)
2. prettyPrintXml(SOAPMessage message)
3. prettyPrintXml(String input)
4. prettyPrintXml(String input)
5. prettyPrintXML(String xml)
6. prettyXml(String xml)
7. prettyXml(String xml)
8. prettyXml(String xml)
9. prettyXmlPrint(Node xml, OutputStream out)