java dom 对xml的操作

package com.linzl.cn.xml;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
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.CDATASection;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
* w3c xml 例子 详细方法可见JDK1.6的API 文档驱动： 缺点： 在处理DOM的时候，我们需要读入整个的XML文档， 然后在内存中创建DOM树，
* 当xml非常大的时候，很消耗内存 超过10M不适用 优点： 形成树结构，代码易编写;解析过程树结构在内存中，方便修改
*
* @author linzl 最后修改时间：2014年10月10日
*/
public class DomUtils {
/**
* 创建DocumentBuilder
*
* @return
* @throws ParserConfigurationException
*/
private static DocumentBuilder createBuilder()
throws ParserConfigurationException {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true); // never forget this!
DocumentBuilder builder = factory.newDocumentBuilder();
return builder;
}

/** * 使用JDK自带的类转换Document对象转成字符串 *  * @param doc * @return * @throws TransformerException */public static String docToString(Document doc) throws TransformerException {    TransformerFactory tf = TransformerFactory.newInstance();    Transformer transformer = tf.newTransformer();    // 设置编码    transformer            .setOutputProperty(OutputKeys.ENCODING, doc.getXmlEncoding());    // 设置格式换行    transformer.setOutputProperty(OutputKeys.INDENT, "yes");    ByteArrayOutputStream bos = new ByteArrayOutputStream();    transformer.transform(new DOMSource(doc), new StreamResult(bos));    return bos.toString();}/** * xml文件转Document *  * @param file * @return * @throws SAXException * @throws IOException * @throws ParserConfigurationException */public static Document fileToDoc(File file)        throws ParserConfigurationException, SAXException, IOException {    // 创建DocumentBuilder    DocumentBuilder builder = createBuilder();    // 创建Document    Document doc = builder.parse(file);    doc.normalize();    return doc;}/** * xml文件转Document *  * @param is * @return * @throws SAXException * @throws IOException * @throws ParserConfigurationException */public static Document fileToDoc(InputStream is)        throws ParserConfigurationException, SAXException, IOException {    // 创建DocumentBuilder    DocumentBuilder builder = createBuilder();    // 创建Document    Document doc = builder.parse(is);    doc.normalize();    return doc;}/** * 字符串内容转换成Document对象 *  * @param xmlStr * @return * @throws ParserConfigurationException * @throws SAXException * @throws IOException */public static Document stringToDoc(String xmlStr)        throws ParserConfigurationException, SAXException, IOException {    DocumentBuilder builder = createBuilder();    StringReader sr = new StringReader(xmlStr);    InputSource is = new InputSource(sr);    Document doc = builder.parse(is);    doc.normalize();    return doc;}/** * 将Document格式化到目标文件 *  * @param doc * @param targetFile * @throws IOException * @throws TransformerException */public static void formatToXMLFile(Document doc, File targetFile)        throws TransformerException, IOException {    TransformerFactory tf = TransformerFactory.newInstance();    Transformer transformer = tf.newTransformer();    // 设置编码    transformer            .setOutputProperty(OutputKeys.ENCODING, doc.getXmlEncoding());    // 设置格式换行    transformer.setOutputProperty(OutputKeys.INDENT, "yes");    ByteArrayOutputStream bos = new ByteArrayOutputStream();    transformer.transform(new DOMSource(doc), new StreamResult(bos));    // 将xmlStr输出到目标路径，使用xml文件的头文件编码    FileOutputStream fos = new FileOutputStream(targetFile);    bos.writeTo(fos);}/** * 将xmlStr格式化到目标文件 *  * @param xmlStr * @param targetFile * @throws ParserConfigurationException * @throws SAXException * @throws IOException * @throws TransformerException */public static void formatToXMLFile(String xmlStr, File targetFile)        throws ParserConfigurationException, SAXException, IOException,        TransformerException {    Document doc = stringToDoc(xmlStr);    formatToXMLFile(doc, targetFile);}/** * 将xml文件格式化到目标文件 *  * @param srcFile *            xml源文件 * @param targetFile *            格式化输出xml文件 * @throws TransformerException * @throws IOException * @throws SAXException * @throws ParserConfigurationException */public static void formatToXMLFile(File srcFile, File targetFile)        throws TransformerException, ParserConfigurationException,        SAXException, IOException {    Document doc = fileToDoc(srcFile);    formatToXMLFile(doc, targetFile);}/** * 打印Document的结点基本信息 *  * @param doc */public static void printNode(Document doc) {    Element root = doc.getDocumentElement();    printRecursive(root);}/** * 递归打印结点信息 *  * @param element */private static void printRecursive(Node element) {    int length = 0;    Node node = null;    NamedNodeMap nnm = element.getAttributes();    if (nnm != null || (length = nnm.getLength()) > 0) {        for (int attrIndex = 0; attrIndex < length; attrIndex++) {            node = nnm.item(attrIndex);            System.err.println("属性名称：" + node.getNodeName() + " -->属性值："                    + node.getNodeValue());        }    }    // NodeList nodeList = element.getElementsByTagName("exoa-config");    NodeList nodeList = element.getChildNodes();    if (nodeList != null && (length = nodeList.getLength()) > 0) {        for (int index = 0; index < length; index++) {            node = nodeList.item(index);            // dom会将换行和注释都做为document的结点，所以去除这些非element结点            if (node != null && node.getNodeType() != Node.ELEMENT_NODE) {                continue;            }            System.err.println("结点名称 -->" + node.getNodeName().trim());            // getTextContent将所有该结点下所有结点的纯文本值            System.err.println("结点下所有结点的值 -->"                    + node.getTextContent().trim());            // 当该结点下只有一个文本结点时，效果等同getTextContent，否则根据JDK中对于Node的解释，getNodeValue是取不到值的            Node child = node.getFirstChild();            if (child != null) {                System.err.println("结点值 -->" + child.getNodeValue().trim());            }            printRecursive(node);        }    }}/** * w3c Dom的生成： 直接按照从上到下的结点顺序创建，然后append在父结点下 *  * @throws ParserConfigurationException * @throws TransformerException */public static void createDocXML() throws ParserConfigurationException,        TransformerException {    Document doc = createBuilder().newDocument();    doc.setXmlStandalone(true);    // 根结点    Element root = doc.createElement("root");    // 注释内容    Comment comment = doc.createComment("根结点注释");    root.appendChild(comment);    // 生成第一个孩子结点    Element rootChildA = doc.createElement("rootChildA");    rootChildA.setTextContent("rootChildA孩子结点");    rootChildA.setAttribute("name", "姓名");    rootChildA.setAttribute("age", "年龄");    rootChildA.setAttribute("height", "身高");    root.appendChild(rootChildA);    Element rootChildB = doc.createElement("rootChildB");    CDATASection cdata = doc.createCDATASection("rootChildB孩子结点");    rootChildB.appendChild(cdata);    root.appendChild(rootChildB);    doc.appendChild(root);    // 规范xml文件，并输出到目标文件    TransformerFactory tf = TransformerFactory.newInstance();    Transformer transformer = tf.newTransformer();    // 设置格式换行    transformer.setOutputProperty(OutputKeys.INDENT, "yes");    DOMSource dos = new DOMSource(doc);    File file = new File("D://w3c.xml");    StreamResult result = new StreamResult(file);    transformer.transform(dos, result);}public boolean removeNode() {    return true;}public boolean updateNode() {    return true;}public static void main(String[] args) throws Exception {    // InputStream is = DomUtils.class    // .getResourceAsStream("/com/linzl/cn/xml/xmlRead.xml");    //    // is = DomUtils.class.getClassLoader().getResourceAsStream(    // "com/linzl/cn/xml/xmlRead.xml");    // is = new    // FileInputStream("F:\\anjianOAdoc\\oadoc\\taitan\\info\\757.xml");    // Document doc = fileToDoc(is);    // printNode(doc);    // createDocXML();    String xmlStr = "F:\\anjianOAdoc\\oadoc\\taitan\\info\\757.xml";    String target = "F:\\anjianOAdoc\\oadoc\\taitan\\missive\\757-副本.xml";    formatToXMLFile(new File(xmlStr), new File(target));}

}