This page demonstrate how to read data from XML file using DOM Parser. . There is a simple one.
Here one example is given on how to retrieve/read data from a XML file
or XML Document. In this example we will be using following XML. It has
four levels of tag (Author>Books>Book>Price).
XML File Content:
<?xml version="1.0" encoding="UTF-8"?>
<Author DOB="" EMailID="" SSN="">
<Extn ExternalSystemCode=""/>
<Books>
<Book BookNo="1" Name="Compiler" PublisherCode="DVT">
<Extn ExtnGiftCoverCode=""/>
<Price DiscountPercentage="" ListPrice="490" UnitOfMeasure=""/>
</Book>
<Book BookNo="2" Name="Microprocessor" PublisherCode="DFS">
<Extn ExtnGiftCoverCode=""/>
<Price DiscountPercentage="10" ListPrice="600" UnitOfMeasure="Each"/>
</Book>
<Book BookNo="3" Name="Compiler" PublisherCode="DVT">
<Extn ExtnGiftCoverCode=""/>
<Price DiscountPercentage="" ListPrice="490" UnitOfMeasure=""> Some VAlue</Price>
</Book>
</Books>
</Author>
Here We will show how to retrieve the ListPrice value for the
Book with BookNo=2.
Java Code:
package com.easy.xmlparsing;
import java.io.File;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class ReadDataFromXml {
public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
//Get Document Object from file.
Document document = docBuilder.parse(new File("Repo.xml"));
//Start with root element. Then navigate the desired / traget element.
Element rootElement = document.getDocumentElement();
//getElementsByTagName() method return List of Nodes (here element).
//In the XML if that element appear only once, this node list will have only one element.
NodeList nodeListBooks = rootElement.getElementsByTagName("Books");
Element booksElm = (Element) nodeListBooks.item(0);
NodeList nodeListBook = booksElm.getElementsByTagName("Book");
Element desiredBookElm = null;
//Iterate over the node list to get the correct/desired element
for (int i = 0; i < nodeListBook.getLength(); i++) {
Element bookElm = (Element) nodeListBook.item(i);
String bookNo=bookElm.getAttribute("BookNo");
if (("2").equals(bookNo)) {
desiredBookElm = bookElm;
}
}
NodeList nodeListPrice = desiredBookElm.getElementsByTagName("Price");
//This PriceElement node is our desire element from where we need to read the ListPrice.
Element priceElm = (Element) nodeListPrice.item(0);
//Reading the value of ListPrice attritbute.
String listPrice = priceElm.getAttribute("ListPrice");
//Redading element content just to show how to get the element content value.
String elmContent=priceElm.getTextContent();
//Printig them in the console to display the output of our java code.
System.out.println("listPrice of BookNo 2 is" + listPrice);
System.out.println("elmContent=" + elmContent);
}
}
Please provide your feedback here
