Getting all XML Elements
In this section, you will learn to retrieve all
elements of the XML file using the DOM APIs. This APIs provides
some constructors and methods which helps us to parse the XML file and retrieve
all elements.
Description of program:
The following program helps you in getting all XML
elements displayed on the console. This program asks for a xml file name and checks
its availability. whether the given file exists or not in the same directory. So,
you need a XML
file (Employee-Detail.xml) that contains some elements. Program parses
the xml file using the parse() method and creates a Document
object Tree. DocumentBuilder object helps you to get
features to parse the XML file. After parsing the XML file a NodeList is
created using the getElementsByTagName().This NodeList object
creates element. Elements name are retrieved using the getNodeName()
method.
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 Java File: DOMElements.java
import java.io.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.*;
public class DOMElements{
static public void main(String[] arg){
try {
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()){
// Create a factory
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
// Use the factory to create a builder
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(xmlFile);
// Get a list of all elements in the document
NodeList list = doc.getElementsByTagName("*");
System.out.println("XML Elements: ");
for (int i=0; i<list.getLength(); i++) {
// Get element
Element element = (Element)list.item(i);
System.out.println(element.getNodeName());
}
}
else{
System.out.print("File not found!");
}
}
catch (Exception e) {
System.exit(1);
}
}
}
|
Download this example.
Output of this program:
C:\vinod\xml>javac DOMElements.java
C:\vinod\xml>java DOMElements
Enter XML File name: Employee-Detail.xml
XML Elements:
Employee-Detail
Employee
Emp_Id
Emp_Name
Emp_E-mail
Employee
Emp_Id
Emp_Name
Emp_E-mail
Employee
Emp_Id
Emp_Name
Emp_E-mail |
|
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