Consider this XML file.
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<data> <employee> <name>John</name> <title>Manager</title> </employee> <employee> <name>Sara</name> <title>Clerk</title> </employee> </data> |
We want to change employee named “John” to “John Paul” You locate the element to change with an XPath query. You change the text and then save back the data.
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import java.io.File; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import javax.xml.xpath.XPath; import javax.xml.xpath.XPathConstants; import javax.xml.xpath.XPathFactory; import org.w3c.dom.Document; import org.w3c.dom.NodeList; import org.xml.sax.InputSource; public class XMLReplaceDemo { static String inputFile = "C:/temp/data.xml"; static String outputFile = "C:/temp/data_new.xml"; public static void main(String[] args) throws Exception { Document doc = DocumentBuilderFactory.newInstance() .newDocumentBuilder().parse(new InputSource(inputFile)); // locate the node(s) XPath xpath = XPathFactory.newInstance().newXPath(); NodeList nodes = (NodeList)xpath.evaluate ("//employee/name[text()='John']", doc, XPathConstants.NODESET); // make the change for (int idx = 0; idx < nodes.getLength(); idx++) { nodes.item(idx).setTextContent("John Paul"); } // save the result Transformer xformer = TransformerFactory.newInstance().newTransformer(); xformer.transform (new DOMSource(doc), new StreamResult(new File(outputFile))); } } |
The result
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<?xml version="1.0" encoding="UTF-8" standalone="no"?><data> <employee> <name>John Paul</name> <title>Manager</title> </employee> <employee> <name>Sara</name> <title>Clerk</title> </employee> </data> |