Regenerating XML file

In this section, you will learn to get the elements and its value using DOM APIs.

Description of program:

This example parses a xml file and regenerates it at the console using the DOM APIs. This program takes a XML file and initially checks its availability . If file exists then it creates DocumentBuilderFactory. This object creates a DocumentBuilder which parses the XML document using the parse() method. It invokes the DocumentBuilder object and creates a Document object. Through this object you create DOM tree nodes by using the getDocumentElement() method and passes it to the DOMSource(). The DOMSource constructor creates a new input source with a DOM node. And the destination source (where you recieve the result) uses the StreamResult() constructor. Here the "System.out" shows the result on the console.

Here is the XML File: Employee-Detail.xml

<?xml version = "1.0" ?>
<Employee-Detail>

<Employee>
<Emp_Id> E-001 </Emp_Id>
<Emp_Name> Vinod </Emp_Name>
<Emp_E-mail> [email protected] </Emp_E-mail>
</Employee>

<Employee>
<Emp_Id> E-002 </Emp_Id>
<Emp_Name> Amit </Emp_Name>
<Emp_E-mail> [email protected] </Emp_E-mail>
</Employee>

<Employee>
<Emp_Id> E-003 </Emp_Id>
<Emp_Name> Deepak </Emp_Name>
<Emp_E-mail> [email protected] </Emp_E-mail>
</Employee>

</Employee-Detail>

Here is the Java File: GetElementsDOM.java


import java.io.*;

import org.w3c.dom.*;

import org.xml.sax.*;

import javax.xml.parsers.*;

import javax.xml.transform.*; 

import javax.xml.transform.dom.*; 

import javax.xml.transform.stream.*;



public class GetElementsDOM{

  static public void main(String[] arg)throws Exception{

  BufferedReader bf = new BufferedReader(

  new InputStreamReader(System.in));

  System.out.print("Enter XML File Name: ");

  String xmlFile = bf.readLine();

  File file = new File(xmlFile);

  if(file.exists()){

  try {

  // Create a factory 

  DocumentBuilderFactory factory = 

   DocumentBuilderFactory.newInstance();

  // Use document builder factory

  DocumentBuilder builder = factory.newDocumentBuilder();

  //Parse the document

  Document doc = builder.parse(xmlFile); 

  TransformerFactory tranFact = 

   TransformerFactory.newInstance(); 

  Transformer transfor = tranFact.newTransformer(); 

  Node node =doc.getDocumentElement();

  Source src = new DOMSource(node); 

  Result dest = new StreamResult(System.out);

  transfor.transform(src, dest);

  }

  catch (Exception e) {

  System.err.println(e);

  }

  }

  else{

  System.out.print("File not found!");

  }

  }

}

Download this example.

Output of this program:

C:\vinod\xml>javac GetElementsDOM.java

C:\vinod\xml>java GetElementsDOM
Enter XML File Name: Employee-Detail.xml
<?xml version="1.0" encoding="UTF-8"?><Employee-Detail>
<Employee>
<Emp_Id> E-001 </Emp_Id>
<Emp_Name> Vinod </Emp_Name>
<Emp_E-mail> [email protected] </Emp_E-mail>
</Employee>

<Employee>
<Emp_Id> E-002 </Emp_Id>
<Emp_Name> Amit </Emp_Name>
<Emp_E-mail> [email protected] </Emp_E-mail>
</Employee>

<Employee>
<Emp_Id> E-003 </Emp_Id>
<Emp_Name> Deepak </Emp_Name>
<Emp_E-mail> [email protected] </Emp_E-mail>
</Employee>

</Employee-Detail>

Regenerating XML file

Regenerating XML file

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Regenerating XML file