xml入门详细基础实例

package domaction; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerFactory; import javax.xml.transform.TransformerFactoryConfigurationError; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.apache.xerces.parsers.DOMParser; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; import org.w3c.dom.Text; import org.xml.sax.InputSource; import org.xml.sax.SAXException; public class DOMAction { public void insertDocument(Document doc, String parent, int index, Element elm, File file) throws TransformerFactoryConfigurationError, FileNotFoundException, TransformerException { NodeList nl = doc.getElementsByTagName(parent); Element n = (Element) nl.item(index); n.insertBefore(elm, n.getFirstChild()); this.toXml(doc, file); } public void updateDocument(Document doc, Element elm, String value, File file) throws FileNotFoundException, TransformerException { if (elm.getFirstChild().getNodeValue() != null) { elm.getFirstChild().setNodeValue(value); } else { Text text = doc.createTextNode(value); elm.insertBefore(text, elm.getFirstChild()); } this.toXml(doc, file); } public void removeDocument(Document doc, Element elm, File file) throws FileNotFoundException, TransformerException { elm.getParentNode().removeChild(elm); this.toXml(doc, file); } public void toXml(Document doc, File file) throws FileNotFoundException, TransformerException { TransformerFactory tf = TransformerFactory.newInstance(); Transformer t = tf.newTransformer(); DOMSource dos = new DOMSource(doc); StreamResult sr = new StreamResult(new FileOutputStream(file)); t.setOutputProperty(OutputKeys.ENCODING, "GB2312"); t.transform(dos, sr); } public static void main(String agrs[]) { File file = new File("student.xml"); DOMParser parser = new DOMParser(); try { parser.parse(new InputSource(new FileInputStream(file))); Document doc = parser.getDocument(); Element elm = doc.createElement("student"); Element elmc1 = doc.createElement("name"); Element elmc2 = doc.createElement("age"); Text text1 = doc.createTextNode("Mary"); Text text2 = doc.createTextNode("23"); elmc1.appendChild(text1); elmc2.appendChild(text2); elm.appendChild(elmc1); elm.appendChild(elmc2); DOMAction dia = new DOMAction(); dia.insertDocument(doc, "students", 0, elm, file); dia.updateDocument(doc, elmc1, "value", file); dia.removeDocument(doc, elmc1, file); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SAXException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (TransformerFactoryConfigurationError e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (TransformerException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }