Main.java Source code

Introduction

Here is the source code for Main.java

Source

    FileShortTitle:Get element by ID FileLongTitle:Get element by ID FileTag:===SectionShortTitle:Question SectionLongTitle:Question SectionContent:

    <p>We would like to know how to get element by ID.</p>

    ===SectionShortTitle:Answer SectionLongTitle:Answer SectionContent:

    <myPreCode>

    import java.io.StringReader;
    import java.io.StringWriter;

    import javax.xml.parsers.DocumentBuilderFactory;
    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.Text;
    import org.xml.sax.InputSource;

    public class Main {
        public static String getXMLData() {
            return "<a><person  number='' dept=''><name>myName</name></person></a>";
        }

        public static void main(String[] argv) throws Exception {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            Document doc = factory.newDocumentBuilder().parse(new InputSource(new StringReader(getXMLData())));

            findByID(doc, "uniqueID");

            System.out.println(documentToString(doc));

        }

        public static void findByID(Document doc, String idName) {
            Element name = doc.getElementById(idName);
            if (name == null) {
                System.out.println("There is no element with the ID " + idName);
            } else {
                Text text = (Text) name.getFirstChild();
                System.out.println("The ID " + idName + " locates the name " + text.getData());
            }
        }

        public static String documentToString(Document document) {
            try {
                TransformerFactory tf = TransformerFactory.newInstance();
                Transformer trans = tf.newTransformer();
                StringWriter sw = new StringWriter();
                trans.transform(new DOMSource(document), new StreamResult(sw));
                return sw.toString();
            } catch (TransformerException tEx) {
                tEx.printStackTrace();
            }
            return null;
        }

}</myPreCode>

    <p>File:personWithDTD.xml</p>

    <myPreCode><!DOCTYPE folks[<!ELEMENT folks (person)*>
<!ELEMENT person (name)>
<!ELEMENT name (#PCDATA)>
<!ATTLIST name nick ID #IMPLIED>
]>
<folks>
    <person>
        <name nick="AlAlite Quandry</name>
    </person>
</folks>
</myPreCode>



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