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XML Well-Formed-ness
Posted on: June 4, 2007 at 12:00 AM

In this section, you will learn to check the well-formed-ness of a XML using the DOM interface.

XML Well-Formed-ness

In this section, you will learn to check the well-formed-ness of a XML using the DOM interface. A well-formed XML document must follow the xml syntax rules.

Description of program:

For checking the "well-formedness" of a XML document you should use the given example. The DOM parser parsers (parse()) the XML document using the DocumentBuilder and DocumentBuilderFactory. Whenever the XML document is well-formed, it shows a message "Employee-Detail.xml is well-formed". Otherwise it displays "Employee-Detail.xml isn't well-formed.".

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> Vinod1@yahoo.com </Emp_E-mail>
</Employee>

<Employee>
<Emp_Id> E-002 </Emp_Id>
<Emp_Name> Amit </Emp_Name>
<Emp_E-mail> Amit2@yahoo.com </Emp_E-mail>
</Employee>

<Employee>
<Emp_Id> E-003 </Emp_Id>
<Emp_Name> Deepak </Emp_Name>
<Emp_E-mail> Deepak3@yahoo.com </Emp_E-mail>
</Employee>

</Employee-Detail>

Here is the Java File: DOMParserCheck.java


import java.io.*;

import javax.xml.parsers.*;

import org.w3c.dom.*;

import org.xml.sax.*;



public class DOMParserCheck {

  static public void main(String[] arg){

  try{

  BufferedReader bf = new BufferedReader(

   new InputStreamReader(System.in));

  System.out.print("Enter File name: ");

  String xmlFile = bf.readLine();

  File file = new File(xmlFile);

  if(file.exists()){

  try {

  // Create a new factory to create parsers 

  DocumentBuilderFactory dBF = 

   DocumentBuilderFactory.newInstance();

  // Use the factory to create a parser (builder) and use

  // it to parse the document.

  DocumentBuilder builder = dBF.newDocumentBuilder();

  // builder.setErrorHandler(new MyErrorHandler());

  InputSource is = new InputSource(xmlFile);

  Document doc = builder.parse(is);

  System.out.println(xmlFile + " is well-formed!");

  }

  catch (Exception e) {

  System.out.println(xmlFile + " isn't well-formed!");

  System.exit(1);

  }

  }

  else{

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

  }

  }

  catch(IOException io){

  io.printStackTrace();

  }

  }

}

Download this example.

Output of program:

C:\vinod\xml>javac DOMParserCheck.java

C:\vinod\xml>java DOMParserCheck
Enter File name: Employee-Detail.xml
Employee-Detail.xml is well-formed!

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