java操作xml

代码都是来自于网上，稍微做了一下修改。

dom方式;

import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.PrintWriter;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.TransformerConfigurationException;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.Node;import org.w3c.dom.NodeList;import org.xml.sax.SAXException;public class DomDemo {private Document document;private static DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();private static DocumentBuilder builder = null;public DomDemo() {init();}private void init() {try {builder = dbf.newDocumentBuilder();this.document = builder.newDocument();} catch (ParserConfigurationException e) {System.out.println(e.getMessage());}}public void createXml(String fileName) {Element root = this.document.createElement("employees");this.document.appendChild(root);Element employee = this.document.createElement("employee");Element name = this.document.createElement("name");name.appendChild(this.document.createTextNode("DomDemo"));employee.appendChild(name);Element sex = this.document.createElement("sex");sex.appendChild(this.document.createTextNode("m"));employee.appendChild(sex);Element age = this.document.createElement("age");age.appendChild(this.document.createTextNode("30"));employee.appendChild(age);root.appendChild(employee);TransformerFactory tf = TransformerFactory.newInstance();try {Transformer transformer = tf.newTransformer();DOMSource source = new DOMSource(document);transformer.setOutputProperty(OutputKeys.ENCODING, "gb2312");transformer.setOutputProperty(OutputKeys.INDENT, "yes");PrintWriter pw = new PrintWriter(new FileOutputStream(fileName));StreamResult result = new StreamResult(pw);transformer.transform(source, result);System.out.println("生成XML文件成功!");} catch (TransformerConfigurationException e) {System.out.println(e.getMessage());} catch (IllegalArgumentException e) {System.out.println(e.getMessage());} catch (FileNotFoundException e) {System.out.println(e.getMessage());} catch (TransformerException e) {System.out.println(e.getMessage());}}public void parserXml(String fileName) {try {Document document = builder.parse(fileName);NodeList employees = document.getChildNodes();for (int i = 0; i < employees.getLength(); i++) {Node employee = employees.item(i);NodeList employeeInfo = employee.getChildNodes();for (int j = 0; j < employeeInfo.getLength(); j++) {Node node = employeeInfo.item(j);NodeList employeeMeta = node.getChildNodes();for (int k = 0; k < employeeMeta.getLength(); k++) {System.out.println(employeeMeta.item(k).getNodeName() + ":" + employeeMeta.item(k).getTextContent());}}}System.out.println("解析完毕");} catch (FileNotFoundException e) {System.out.println(e.getMessage());} catch (SAXException e) {System.out.println(e.getMessage());} catch (IOException e) {System.out.println(e.getMessage());}}public static void main(String[] args) {DomDemo dom = new DomDemo();String fileName = "d:/DomDemo.xml";dom.createXml(fileName);dom.parserXml(fileName);}}

SAX方式：

import java.io.File;import java.util.Vector;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;public class SAXDemo extends DefaultHandler {private Vector<String> tagName;private Vector<String> tagValue;private int step;// 开始解析XML文件public void startDocument() throws SAXException {tagName = new Vector<String>();tagValue = new Vector<String>();step = 0;}// 结束解析XML文件public void endDocument() throws SAXException {for (int i = 0; i < tagName.size(); i++) {if (!tagName.get(i).equals("") || tagName.get(i) != null) {System.out.println("节点名称：" + tagName.get(i));System.out.println("节点值：" + tagValue.get(i));}}}/** * 在解释到一个开始元素时会调用此方法.但是当元素有重复时可以自己写算法来区分 这些重复的元素.qName是什么? <name:page * ll=""></name:page>这样写就会抛出SAXException错误 通常情况下qName等于localName */public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {// 节点名称tagName.add(qName);// 循环输出属性for (int i = 0; i < attributes.getLength(); i++) {// 获取属性名称System.out.println("属性名称：" + attributes.getQName(i));// 获取属性值System.out.println("属性值：" + attributes.getValue(attributes.getQName(i)));}}/** * 在遇到结束标签时调用此方法 */public void endElement(String uri, String localName, String qName) throws SAXException {step = step + 1;}/** * 读取标签里的值,ch用来存放某行的xml的字符数据,包括标签,初始大小是2048, 每解释到新的字符会把它添加到char[]里。 * * 注意,这个char字符会自己管理存储的字符, 并不是每一行就会刷新一次char,start,length是由xml的元素数据确定的, * 暂时找不到规律,以后看源代码. *  * 这里一个正标签，反标签都会被执行一次characters，所以在反标签时不用获得其中的值 */public void characters(char ch[], int start, int length) throws SAXException {// 只要当前的标签组的长度一至，值就不赋，则反标签不被计划在内if (tagName.size() - 1 == tagValue.size()) {tagValue.add(new String(ch, start, length));}}public static void main(String[] args) {String filename = "d:/SAXDemo.xml";SAXParserFactory spf = SAXParserFactory.newInstance();try {SAXParser saxParser = spf.newSAXParser();saxParser.parse(new File(filename), new SAXDemo());} catch (Exception e) {e.printStackTrace();}}}

dom4j方式：

import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.io.Writer;import java.util.Iterator;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.DocumentHelper;import org.dom4j.Element;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;public class Dom4jDemo {public void createXml(String fileName) {Document document = DocumentHelper.createDocument();Element employees = document.addElement("employees");Element employee = employees.addElement("employee");Element name = employee.addElement("name");name.setText("Dom4jDemo");Element sex = employee.addElement("sex");sex.setText("m");Element age = employee.addElement("age");age.setText("29");try {Writer fileWriter = new FileWriter(fileName);XMLWriter xmlWriter = new XMLWriter(fileWriter);xmlWriter.write(document);xmlWriter.close();} catch (IOException e) {System.out.println(e.getMessage());}}public void parserXml(String fileName) {File inputXml = new File(fileName);SAXReader saxReader = new SAXReader();try {Document document = saxReader.read(inputXml);Element employees = document.getRootElement();for (Iterator<?> i = employees.elementIterator(); i.hasNext();) {Element employee = (Element) i.next();for (Iterator<?> j = employee.elementIterator(); j.hasNext();) {Element node = (Element) j.next();System.out.println(node.getName() + ":" + node.getText());}}} catch (DocumentException e) {System.out.println(e.getMessage());}System.out.println("dom4j parserXml");}public static void main(String[] args) {Dom4jDemo dom4j = new Dom4jDemo();String fileName = "d:/Dom4jDemo.xml";dom4j.createXml(fileName);dom4j.parserXml(fileName);}}

jdom方式：

import java.io.FileOutputStream;import java.io.IOException;import org.jdom.Document;import org.jdom.Element;import org.jdom.JDOMException;import org.jdom.input.SAXBuilder;import org.jdom.output.Format;import org.jdom.output.XMLOutputter;import org.jdom.xpath.XPath;public class JDomDemo {public void createXml(String fileName) {Document doc = new Document();Element employees = new Element("employees");doc.setRootElement(employees);Element employee = new Element("employee");Element name = new Element("name");name.setText("JDomDemo");employees.addContent(employee);employee.addContent(name);name.setAttribute("attr", "a");XMLOutputter xmlOut = new XMLOutputter();Format fmt = Format.getPrettyFormat();fmt.setIndent("    ");// 四个空格fmt.setEncoding("gb2312");xmlOut.setFormat(fmt);FileOutputStream out = null;try {out = new FileOutputStream(fileName);xmlOut.output(doc, out);} catch (IOException e) {e.printStackTrace();}}public void parserXml(String fileName) {SAXBuilder sax = new SAXBuilder();try {Document doc = sax.build(fileName);Element rootEle = doc.getRootElement();Element nameElement = (Element) XPath.selectSingleNode(rootEle, "/employees/employee/name");String name = nameElement.getText();System.out.println("name = " + name);} catch (JDOMException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}public static void main(String[] args) {JDomDemo jDomDemo = new JDomDemo();String fileName = "d:/JDomDemo.xml";jDomDemo.createXml(fileName);jDomDemo.parserXml(fileName);}}

另外，还有其他的方式，比如xstream等。