Getting The XML Root Element
After reading this section, you will be able to
retrieve a root element from the XML document. The JAXP (Java APIs for XML
Processing) provides a common interface for creating and using xml files
using the standard
SAX, DOM and XSLTs. Here you will see the given example to use DOM
interface.
Description of program:
You need a XML
document (file). Both Java and the XML file are kept in the same directory. This
program takes a XML file as a String at the console . If the given file
exists then it parses the document using parse() method . Before parsing
the XML document you need a DocumentBuilder object. For creating this
first of all you create a DocumentBuilderFactory. After parsing the XML
document you get the node element using getDocumentElement() method. To get the root
element use 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 the Java File: GetRootNode.java
import org.w3c.dom.*;
import javax.xml.parsers.*;
import java.io.*;
public class GetRootNode{
public static void main(String[] args) {
try{
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter xml file name: ");
String str = bf.readLine();
File file = new File(str);
if (file.exists()){
DocumentBuilderFactory fact = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = fact.newDocumentBuilder();
Document doc = builder.parse(str);
Node node = doc.getDocumentElement();
String root = node.getNodeName();
System.out.println("Root Node: " + root);
}
else{
System.out.println("File not found!");
}
}
catch(Exception e){}
}
}
|
Download this example.
Output of the program:
C:\vinod\xml>javac GetRootNode.java
C:\vinod\xml>java GetRootNode
Enter xml file name: Employee-Detail.xml
Root Node: Employee-Detail |
|
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