To Count The Elements in a XML File
In this section, you will learn to count the element in
XML document using DOM APIs defined in the org.apache.xerces.parsers.DOMParser
package. Your classpath must contain xercesImpl.jar and
xml-apis.jar files to run this program.
You can download it from Xerces
Description of program: This program takes a file name
from the
console and checks its availability. If the file exists then DOMParser
is created using the org.apache.xerces.parsers.DOMParser
package.This object parses the given XML document. It asks the element name and
counts its occurence in the xml file. If the given element doesn't exist
it displays the '0' element.
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: CountNodes.java
import org.w3c.dom.*;
import org.apache.xerces.parsers.DOMParser;
import java.io.*;
public class CountNodes{
public static void main(String[] args) {
try{
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter file name: ");
String str = bf.readLine();
File file = new File(str);
if (file.exists()){
DOMParser parser = new DOMParser();
parser.parse(str);
Document doc = parser.getDocument();
System.out.print("Enter element that have to count: ");
String ele = bf.readLine();
NodeList list = doc.getElementsByTagName(ele);
System.out.println("Number of nodes: " + list.getLength());
}
else{
System.out.println("File not found!");
}
}
catch (Exception e){
e.getMessage();
}
}
}
|
Download this example.
Output of program:
C:\vinod\xml>javac CountNodes.java
C:\vinod\xml>java CountNodes
Enter file name: Employee-Detail.xml
Enter element that have to count: Emp_Name
Number of nodes: 3 |
|
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