【转】使用DOM组装和解析XML
使用DOM组装和解析XML
package com.gjw.test; import java.io.PrintWriter; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; 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; /** * @说明 使用DOM组装和解析XML * @author cuisuqiang * @version 1.0 * @since */ public class DomDemo{ public static void main(String[] args) { DomDemo d = new DomDemo(); String file = "C:\\p.xml"; // 文件存放位置 d.createXml(file); d.parserXml(file); } /** * 生成XML文件 * @param filePath 文件存放位置 */ public void createXml(String filePath) { try { // 定义工厂 API,使应用程序能够从 XML 文档获取生成 DOM 对象树的解析器 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); // 定义 API, 使其从 XML 文档获取 DOM 文档实例。使用此类,应用程序员可以从 XML 获取一个 Document DocumentBuilder builder = factory.newDocumentBuilder(); // Document 接口表示整个 HTML 或 XML 文档。从概念上讲,它是文档树的根,并提供对文档数据的基本访问 Document document = builder.newDocument(); Element root = document.createElement("persons"); document.appendChild(root); Element person = document.createElement("person"); Element name = document.createElement("name"); name.appendChild(document.createTextNode("java小强")); person.appendChild(name); Element sex = document.createElement("sex"); sex.appendChild(document.createTextNode("man")); person.appendChild(sex); Element age = document.createElement("age"); age.appendChild(document.createTextNode("30")); person.appendChild(age); root.appendChild(person); TransformerFactory tf = TransformerFactory.newInstance(); // 此抽象类的实例能够将源树转换为结果树 Transformer transformer = tf.newTransformer(); DOMSource source = new DOMSource(document); transformer.setOutputProperty(OutputKeys.ENCODING, "utf-8"); // 一个节点后换行,你可以设置为true,然后尝试解析看打印结果 transformer.setOutputProperty(OutputKeys.INDENT, "yes"); // 向文本输出流打印对象的格式化表示形式 // 要保证你的文本输出后格式不乱码,打印对象需指定打印格式,以标记此文本支持的格式 PrintWriter pw = new PrintWriter(filePath, "utf-8"); // 充当转换结果的持有者,可以为 XML、纯文本、HTML 或某些其他格式的标记 StreamResult result = new StreamResult(pw); transformer.transform(source, result); System.out.println("生成XML文件成功!"); } catch (Exception e) { e.printStackTrace(); } } /** * 解析XML * @param filePath 文件位置 */ public void parserXml(String filePath) { try { DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbf.newDocumentBuilder(); Document document = db.parse(filePath); // 接口提供对节点的有序集合的抽象,没有定义或约束如何实现此集合。DOM 中的 NodeList 对象是活动的 // NodeList 中的项可以通过从 0 开始的整数索引进行访问 NodeList xml = document.getChildNodes(); for (int i = 0; i < xml.getLength(); i++) { Node roots = xml.item(i); NodeList persons = roots.getChildNodes(); for (int j = 0; j < persons.getLength(); j++) { Node person = persons.item(j); NodeList pros = person.getChildNodes(); for (int k = 0; k < pros.getLength(); k++) { Node item = pros.item(k); System.out.println(item.getNodeName() + ":" + item.getTextContent()); } } } System.out.println("XML解析完毕"); } catch (Exception e) { e.printStackTrace(); } } }
DOM4J解析XML
package com.gjw.test; import java.io.File; import java.io.PrintStream; 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; /** * @说明 DOM4J解析XML * @author cuisuqiang * @version 1.0 * @since */ @SuppressWarnings("unchecked") public class Dom4jDemo { public static void main(String[] args) { String file = "C:\\p.xml"; // 文件存放位置 Dom4jDemo dj = new Dom4jDemo(); dj.createXml(file); dj.parserXml(file); } /** * 生成XML * @param filePath 文件路径 */ public void createXml(String filePath) { Document document = DocumentHelper.createDocument(); Element employees = document.addElement("persons"); Element employee = employees.addElement("person"); Element name = employee.addElement("name"); name.setText("java小强"); Element sex = employee.addElement("sex"); sex.setText("男"); Element age = employee.addElement("age"); age.setText("26"); try { // PrintWriter带有编码格式的构造方法有助于解决乱码问题 PrintStream pw = new PrintStream(filePath); //PrintWriter pw = new PrintWriter(filePath, "utf-8"); XMLWriter xmlWriter = new XMLWriter(pw); xmlWriter.write(document); pw.close(); xmlWriter.close(); } catch (Exception e) { e.printStackTrace(); } } /** * 解析XML * @param filePath 文件路径 */ public void parserXml(String filePath) { File inputXml = new File(filePath); SAXReader saxReader = new SAXReader(); try { Document document = saxReader.read(inputXml); Element root = document.getRootElement(); for (Iterator persons = root.elementIterator(); persons.hasNext();) { Element person = (Element) persons.next(); for (Iterator pro = person.elementIterator(); pro.hasNext();) { Element node = (Element) pro.next(); System.out.print(node.getName() + ":" + node.getText() + "\t"); } System.out.println(); } } catch (DocumentException e) { e.printStackTrace(); } } }
转自http://cuisuqiang.iteye.com/blog/1935425
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