JAVA 解析 XMl：DOM SAX ..

public class DOMDemo {
    public static void main(String[] args) {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            File file = new File("src/com/ibatis/jpetstore/persistence/sqlmapdao/sql/sql-map-config.xml");
            Document doc = builder.parse(file);
            Element root = doc.getDocumentElement();
            showDom(root, "");
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static void showDom(Node root, String lpad) {

        //如果是文本节点，输出并返回
        if(root.getNodeType() == Node.TEXT_NODE){
            //如果只有"\n"和" ",不输出。
            if(false){
                return;
            }
            System.out.println(lpad + root.getNodeValue());
            return;
        }

        //如果是Element节点，输出
        if(root.getNodeType() == Node.ELEMENT_NODE){
            StringBuilder prex = new StringBuilder("");
            prex.append(lpad + "<" + root.getNodeName() + " ");
            NamedNodeMap attrs =  root.getAttributes();

            //如果有属性，遍历输出
            Node attr;
            for(int i=0; attrs.getLength() > 0 && i < attrs.getLength(); i++){
                attr = attrs.item(i);
                prex.append(attr.getNodeName() + "=\"" + attr.getNodeValue() + "\" ");
            }

            //如果不包含子节点，输出结束标签"/>"，并返回
            if(!root.hasChildNodes()){
                prex.append("/>");
                System.out.println(prex.toString());
                return;
            }

            //如果包含子节点，输出结束标签">"，并遍历子节点，最后输出关闭标签。
            prex.append(">");
            System.out.println(prex.toString());

            NodeList children = root.getChildNodes();
            for(int i=0; i < children.getLength(); i++){
                showDom(children.item(i), "  " + lpad);
            }

            System.out.println(lpad + " + root.getNodeName() + " >");
        }
    }
}