Updating an XML String

问题

From the given XML String, i have to update End Date value . Even though I'm updating the xml in updateNodeValue() method, my final output xml is same as the input xml.

Can someone tell me what is the mistake in this code

import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
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.InputSource;


public class MyClass{

    static String strXml = "<INFO><BeginDate>2013-12-02</BeginDate><EndDate>2014-01-31</EndDate></INFO>";

    public static void main(String[] args) throws Exception {

        System.out.println(strXml);
        Document doc = StringToDocument(strXml);
        updateNodeValue(doc);
        String newxml = DocumentToString(doc);
        System.out.println(newxml);

    }

    public static void updateNodeValue(Document doc) {

        Node rootNode = doc.getFirstChild();
        NodeList list = rootNode.getChildNodes();
        for (int i = 0; i < list.getLength(); i++) {

            Element element = (Element) list.item(i);
            Node node = list.item(i);
            if ("EndDate".equals(node.getNodeName())) {
                element.setNodeValue("2013-12-12");
                return;
            }
        }
    }

    public static String DocumentToString(Document doc) throws Exception {

        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.newTransformer();
        transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
        StringWriter writer = new StringWriter();
        transformer.transform(new DOMSource(doc), new StreamResult(writer));
        String output = writer.getBuffer().toString();
        return output;
    }

    public static Document StringToDocument(String strXml) throws Exception {

        Document doc = null;
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            StringReader strReader = new StringReader(strXml);
            InputSource is = new InputSource(strReader);
            doc = (Document) builder.parse(is);
        } catch (Exception e) {
            e.printStackTrace();
            throw e;
        }

        return doc;
    }
}

回答1:

Useelement.setTextContent(...) in your updateNodeValue method.

回答2:

The method you should use is not setNodeValue() but setTextContent()

See http://docs.oracle.com/javase/1.5.0/docs/api/org/w3c/dom/Node.html#setNodeValue(java.lang.String)

来源：https://stackoverflow.com/questions/20354466/updating-an-xml-string