Java DOM 生成XML

package com.xml.oper; import java.util.ArrayList; import java.util.List; import org.apache.log4j.Logger; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; /** * @ClassName: XmlOper * @Description: 对XML文件进行读写操作,均为静态函数 * @author linwenming * @date 2010-6-5 * */ public class XmlOper { private XmlOper() { } /** * 获取父结点parent的所有子结点<B> * * @author linwenming * @date 2010-6-5 */ public static NodeList getNodeList(Element parent) { return parent.getChildNodes(); } /** * 在父结点中查询指定名称的结点集 * * @author linwenming * @date 2010-6-5 */ public static List<Element> getElementsByName(Element parent, String name) { NodeList nodeList = getNodeList(parent); List<Element> tempList = new ArrayList<Element>(); for (int i = 0; i < nodeList.getLength(); i++) { Node node = nodeList.item(i); if (node.getNodeName().equals(name)) { tempList.add((Element) node); } } logger.debug(parent.getNodeName() + "'s children of " + name + "'s num:" + tempList.size()); return tempList; } /** * 获取指定Element的名称 * * @author linwenming * @date 2010-6-5 */ public static String getElementName(Element element) { return element.getNodeName(); } /** * 获取指定Element的值 * * @author linwenming * @date 2010-6-5 */ public static String getElementValue(Element element) { NodeList nl = getNodeList(element); for (int i = 0; i < nl.getLength(); i++) { if (nl.item(i).getNodeType() == Node.TEXT_NODE) // is text node { logger.debug(element.getNodeName() + " has a Text Node."); return element.getFirstChild().getNodeValue(); } } logger.error(element.getNodeName() + " hasn't a Text Node."); return null; } /** * 获取指定Element的属性attr的值 * * @author linwenming * @date 2010-6-5 */ public static String getElementAttr(Element element, String attr) { return element.getAttribute(attr); } /** * 设置指定Element的值 * * @author linwenming * @date 2010-6-5 */ public static void setElementValue(Element element, String value) { NodeList nl = getNodeList(element); for (int i = 0; i < nl.getLength(); i++) { Node nd = nl.item(i); if (nd.getNodeType() == Node.TEXT_NODE) { nd.setNodeValue(value); logger.debug("modify " + element.getNodeName() + "'s node value succe."); return; } } logger.debug("new " + element.getNodeName() + "'s node value succe."); Node node = element.getOwnerDocument().createTextNode(value); element.appendChild(node); } /** * 设置结点Element的属性 * * @author linwenming * @date 2010-6-5 */ public static void setElementAttr(Element element, String attr, String value) { element.setAttribute(attr, value); } /** * 在parent下增加结点 * * @author linwenming * @date 2010-6-5 */ public static void addElement(Element parent, Element child) { parent.appendChild(child); } /** * 在parent下增加结点 * * @author linwenming * @date 2010-6-5 */ public static void addElement(Element parent, String tagName) { Element element = parent.getOwnerDocument().createElement(tagName); element.appendChild(element); } public static void addElement(Element parent, String tagName, String value) { Document doc = parent.getOwnerDocument(); Element child = doc.createElement(tagName); setElementValue(child, value); parent.appendChild(child); } /** * 将父结点parent下的名称为tagName的结点移除 * @author linwenming * @date 2010-6-7 */ public static void removeElement(Element parent, String tagName) { logger.debug("remove " + parent.getNodeName() + "'s children by tagName " + tagName + " begin..."); NodeList nl = parent.getChildNodes(); for (int i = 0; i < nl.getLength(); i++) { Node nd = nl.item(i); if (nd.getNodeName().equals(tagName)) { parent.removeChild(nd); logger.debug("remove child '" + nd + "' success."); } } logger.debug("remove " + parent.getNodeName() + "'s children by tagName " + tagName + " end."); } /* 全局变量 */ static Logger logger = Logger.getLogger("XmlOper"); }