How to pretty print XML from Java?

I have an xml which is non-format as below. How i can make it nicely formatted xml.



<?xml version="1.0"?>
<catalog><book id="bk101"><author>Amuthan G</author><title>Spring MVC: Beginner's Guide</title><genre>Computer</genre> <price>40.49</price><publish_date>2014-07-25</publish_date><description>Your ultimate guide to building a complete web application using all the capabilities of Spring MVC</description></book><book id="bk102"><author> J. Sharma, Ashish Sarin</author><title>Getting started with Spring Framework</title><genre>Computer</genre><price>14.01</price>
<publish_date>2012-12-10</publish_date><description>Getting started with Spring Framework is a hands-on guide to begin developing applications using Spring Framework.</description></book><book id="bk103"><author>Herbert Schildt</author><title>Java, A Beginner's Guide</title><genre>Computer</genre><price>37.75</price><publish_date>2011-08-16</publish_date><description>Learn the fundamentals of Java programming in no time from bestselling programming author Herb Schildt.</description></book></catalog>

<?xml version="1.0"?>

<catalog><book id="bk101"><author>Amuthan G</author><title>Spring MVC: Beginner's Guide</title><genre>Computer</genre> <price>40.49</price><publish_date>2014-07-25</publish_date><description>Your ultimate guide to building a complete web application using all the capabilities of Spring MVC</description></book><book id="bk102"><author> J. Sharma, Ashish Sarin</author><title>Getting started with Spring Framework</title><genre>Computer</genre><price>14.01</price>

<publish_date>2012-12-10</publish_date><description>Getting started with Spring Framework is a hands-on guide to begin developing applications using Spring Framework.</description></book><book id="bk103"><author>Herbert Schildt</author><title>Java, A Beginner's Guide</title><genre>Computer</genre><price>37.75</price><publish_date>2011-08-16</publish_date><description>Learn the fundamentals of Java programming in no time from bestselling programming author Herb Schildt.</description></book></catalog>

Pass the books.xml in the below program , run the program and see output.



import org.w3c.dom.Document;
import org.xml.sax.SAXException;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream; 
import java.io.FileNotFoundException;
import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;


public class XMLPrettyPrint {
	
public static void main(String[] args) throws ParserConfigurationException,
FileNotFoundException, SAXException, IOException {
	
	
	 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();  
	 DocumentBuilder builder;  
	     
	 builder = factory.newDocumentBuilder();
	 Document doc = builder.parse(new FileInputStream
			 (new File("C://Users/Sreenath/Desktop/books.xml")));	      
	    
	 String str = xmlPrettyPrint(doc,"UTF-8");
	 
	 System.out.println(str);
	
}


public static String xmlPrettyPrint(Document doc, String encoding) {
    
	String xmlString = null;
	try {
        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        ByteArrayOutputStream xmlBytes = new ByteArrayOutputStream();
        Transformer transformer = transformerFactory.newTransformer();
        if(encoding != null) {
        	transformer.setOutputProperty(OutputKeys.ENCODING, encoding);
        	transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
        } else {
        	transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");            	
        }
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
        transformer.transform(new DOMSource(doc), new StreamResult(xmlBytes));
        xmlString = xmlBytes.toString();
        
    } catch (Exception e) {
    	e.printStackTrace();
    }
    
    return xmlString;
}
}

import org.w3c.dom.Document;

import org.xml.sax.SAXException;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.transform.OutputKeys;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;

public class XMLPrettyPrint {

public static void main(String[] args) throws ParserConfigurationException,

FileNotFoundException, SAXException, IOException {

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

DocumentBuilder builder;

builder = factory.newDocumentBuilder();

Document doc = builder.parse(new FileInputStream

(new File("C://Users/Sreenath/Desktop/books.xml")));

String str = xmlPrettyPrint(doc,"UTF-8");

System.out.println(str);

}

public static String xmlPrettyPrint(Document doc, String encoding) {

String xmlString = null;

try {

TransformerFactory transformerFactory = TransformerFactory.newInstance();

ByteArrayOutputStream xmlBytes = new ByteArrayOutputStream();

Transformer transformer = transformerFactory.newTransformer();

if(encoding != null) {

transformer.setOutputProperty(OutputKeys.ENCODING, encoding);

transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");

} else {

transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");

}

transformer.setOutputProperty(OutputKeys.METHOD, "xml");

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

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

transformer.transform(new DOMSource(doc), new StreamResult(xmlBytes));

xmlString = xmlBytes.toString();

} catch (Exception e) {

e.printStackTrace();

}

return xmlString;

}

Output: Now we can see that books.xml is printed in nice format.



<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<catalog>
  <book id="bk101">
    <author>Amuthan G</author>
    <title>Spring MVC: Beginner's Guide</title>
    <genre>Computer</genre> <price>40.49</price>
    <publish_date>2014-07-25</publish_date>
    <description>Your ultimate guide to building a complete web application using all the capabilities of Spring MVC</description>
  </book>
  <book id="bk102">
    <author> J. Sharma, Ashish Sarin</author>
    <title>Getting started with Spring Framework</title>
    <genre>Computer</genre>
    <price>14.01</price>
<publish_date>2012-12-10</publish_date>
    <description>Getting started with Spring Framework is a hands-on guide to begin developing applications using Spring Framework.</description>
  </book>
  <book id="bk103">
    <author>Herbert Schildt</author>
    <title>Java, A Beginner's Guide</title>
    <genre>Computer</genre>
    <price>37.75</price>
    <publish_date>2011-08-16</publish_date>
    <description>Learn the fundamentals of Java programming in no time from bestselling programming author Herb Schildt.</description>
  </book>
</catalog>

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

<author>Amuthan G</author>

<title>Spring MVC: Beginner's Guide</title>

<genre>Computer</genre> <price>40.49</price>

<publish_date>2014-07-25</publish_date>

<description>Your ultimate guide to building a complete web application using all the capabilities of Spring MVC</description>

</book>

<author> J. Sharma, Ashish Sarin</author>

<title>Getting started with Spring Framework</title>

<genre>Computer</genre>

<publish_date>2012-12-10</publish_date>

<description>Getting started with Spring Framework is a hands-on guide to begin developing applications using Spring Framework.</description>

</book>

<author>Herbert Schildt</author>

<title>Java, A Beginner's Guide</title>

<genre>Computer</genre>

<publish_date>2011-08-16</publish_date>

<description>Learn the fundamentals of Java programming in no time from bestselling programming author Herb Schildt.</description>

</book>

</catalog>

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