Created
October 6, 2017 17:17
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Deletion of node from XML file using DOM Parser
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package com.javamultiplex; | |
import java.io.BufferedReader; | |
import java.io.File; | |
import java.io.IOException; | |
import java.io.InputStreamReader; | |
import javax.xml.parsers.DocumentBuilder; | |
import javax.xml.parsers.DocumentBuilderFactory; | |
import javax.xml.parsers.ParserConfigurationException; | |
import javax.xml.transform.OutputKeys; | |
import javax.xml.transform.Transformer; | |
import javax.xml.transform.TransformerException; | |
import javax.xml.transform.TransformerFactory; | |
import javax.xml.transform.dom.DOMSource; | |
import javax.xml.transform.stream.StreamResult; | |
import org.w3c.dom.Document; | |
import org.w3c.dom.Element; | |
import org.w3c.dom.Node; | |
import org.w3c.dom.NodeList; | |
import org.xml.sax.SAXException; | |
public class DeleteEmployee { | |
public static void main(String[] args) throws IOException,ParserConfigurationException, SAXException, TransformerException { | |
File file = new File("src/main/resources/employee.xml"); | |
BufferedReader input = null; | |
try { | |
input = new BufferedReader(new InputStreamReader(System.in)); | |
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); | |
DocumentBuilder builder = factory.newDocumentBuilder(); | |
Document document = builder.parse(file); | |
System.out.println("Enter employee id : "); | |
int id = Integer.parseInt(input.readLine()); | |
boolean result = deleteEmployeeFromXml(document, id); | |
if (result) { | |
TransformerFactory tFactory = TransformerFactory.newInstance(); | |
Transformer transformer = tFactory.newTransformer(); | |
transformer.setOutputProperty(OutputKeys.INDENT, "yes"); | |
DOMSource source = new DOMSource(document); | |
StreamResult sResult = new StreamResult(file); | |
transformer.transform(source, sResult); | |
System.out.println("Employee has been deleted successfully."); | |
} else { | |
System.out.println("Employee not exist."); | |
} | |
} finally { | |
if (input != null) { | |
input.close(); | |
} | |
} | |
} | |
private static boolean deleteEmployeeFromXml(Document document, int id){ | |
NodeList list = document.getElementsByTagName("Employee"); | |
boolean result = false; | |
int length = list.getLength(); | |
for (int i = 0; i < length; i++) { | |
Node node = list.item(i); | |
if (node.getNodeType() == Node.ELEMENT_NODE) { | |
Element element = (Element) node; | |
if (element.getAttribute("id").equals(String.valueOf(id))) { | |
Node prev = node.getPreviousSibling(); | |
if (prev != null && prev.getNodeType() == Node.TEXT_NODE && prev.getNodeValue().trim().length() == 0) { | |
document.getDocumentElement().removeChild(prev); | |
} | |
document.getDocumentElement().removeChild(element); | |
result=true; | |
break; | |
} | |
} | |
} | |
return result; | |
} | |
} |
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