CODEWITHSUNDEEP
javadom
Arvind
Arvind

Reputation: 6474

Java- how to obtain full xml stored in modified DOM Document

I am using standard Java DOM parser to process an xml file-

I have processed it and made changes to the xml document, now I want to view the modified xml. How do I store the modified XML into a string variable.

For your reference, the code I am using is given below--

        str = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><config><var-def name=\"initial_no\">3972971</var-def><var-def name=\"webpage\">asdf</var-def><cloudwhile condition=\"${i.toInt() != 500}\" index=\"i\" returnvalue=\"false\" indexstart=\"1\" upperbound=\"500\"><var-def name=\"webpage\" overwrite=\"true\"><cloudwhile condition=\"${i.toInt() != 500}\" index=\"i\" returnvalue=\"false\" indexstart=\"100\" upperbound=\"700\"></cloudwhile><try><body><http url=\"www.google.com/patents/US${initial_no.toInt()+i.toInt()}\"/></body><catch>ERROR- No content found for this patent number.</catch></try></var-def><file action=\"write\" path=\"data/${initial_no.toInt()+i.toInt()}_content.html\"><var name=\"webpage\"/></file></cloudwhile></config>";
        InputStream is = new ByteArrayInputStream(str.getBytes("UTF-8"));
        DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
        Document doc = docBuilder.parse(is);
                    //some processing..

Upvotes: 1

Views: 527

Answers (2)

dragon66
dragon66

Reputation: 2715

You can use Transformer API to do what you want:

import java.io.*;
import org.w3c.dom.*;
import javax.xml.parsers.*;

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

class SaveDom 
{
    public static void main(String[] args) throws Exception
    {
        String str = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><config><var-def name=\"initial_no\">3972971</var-def><var-def name=\"webpage\">asdf</var-def><cloudwhile condition=\"${i.toInt() != 500}\" index=\"i\" returnvalue=\"false\" indexstart=\"1\" upperbound=\"500\"><var-def name=\"webpage\" overwrite=\"true\"><cloudwhile condition=\"${i.toInt() != 500}\" index=\"i\" returnvalue=\"false\" indexstart=\"100\" upperbound=\"700\"></cloudwhile><try><body><http url=\"www.google.com/patents/US${initial_no.toInt()+i.toInt()}\"/></body><catch>ERROR- No content found for this patent number.</catch></try></var-def><file action=\"write\" path=\"data/${initial_no.toInt()+i.toInt()}_content.html\"><var name=\"webpage\"/></file></cloudwhile></config>";
        InputStream is = new ByteArrayInputStream(str.getBytes("UTF-8"));
        DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
        Document doc = docBuilder.parse(is);

        // Write out the xml file
        // Use a Transformer for output
        TransformerFactory tFactory = TransformerFactory.newInstance();
        Transformer transformer = tFactory.newTransformer();
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");
        transformer.setOutputProperty( OutputKeys.INDENT, "yes" );
        transformer.setOutputProperty("encoding", "UTF-8");

        DOMSource source = new DOMSource(doc);
        java.io.StringWriter sw = new java.io.StringWriter();
        StreamResult _result = new StreamResult(sw);
        transformer.transform(source, _result);
        String out = sw.toString();
        System.out.println(out);
    }
}

Upvotes: 1

Joseph Samuel
Joseph Samuel

Reputation: 261

You can use a Transformer to output the document once you have manipulated it. Here is an example of adding an attribute to the first child.

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

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

public class XmlExample {

    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, TransformerException {
        String str = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><config><var-def name=\"initial_no\">3972971</var-def><var-def name=\"webpage\">asdf</var-def><cloudwhile condition=\"${i.toInt() != 500}\" index=\"i\" returnvalue=\"false\" indexstart=\"1\" upperbound=\"500\"><var-def name=\"webpage\" overwrite=\"true\"><cloudwhile condition=\"${i.toInt() != 500}\" index=\"i\" returnvalue=\"false\" indexstart=\"100\" upperbound=\"700\"></cloudwhile><try><body><http url=\"www.google.com/patents/US${initial_no.toInt()+i.toInt()}\"/></body><catch>ERROR- No content found for this patent number.</catch></try></var-def><file action=\"write\" path=\"data/${initial_no.toInt()+i.toInt()}_content.html\"><var name=\"webpage\"/></file></cloudwhile></config>";
        InputStream is = new ByteArrayInputStream(str.getBytes("UTF-8"));
        DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
        Document doc = docBuilder.parse(is);

        // Example processing:  Add an attribute to first child
        NamedNodeMap attributes = doc.getFirstChild().getAttributes();
        Attr attribute = doc.createAttribute("joes-attribute");
        attribute.setValue("joes-value");
        attributes.setNamedItem(attribute);

        // Use a Transformer to output to whatever you want.
        TransformerFactory tFactory =
          TransformerFactory.newInstance();
        Transformer transformer = tFactory.newTransformer();

        DOMSource source = new DOMSource(doc);
        StreamResult result = new StreamResult(System.out);
        transformer.transform(source, result);
    }
}

You can read more about it: http://www.petefreitag.com/item/445.cfm

Upvotes: 1

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