本文研究的主要是java使用DOM對XML文檔進行增刪改查操作的相關代碼，具體實例如下所示。
原始碼:
package com.zc.homeWork18;import java.io.File;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import javax.xml.xpath.XPath;import javax.xml.xpath.XPathConstants;import javax.xml.xpath.XPathExpressionException;import javax.xml.xpath.XPathFactory;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;public class XMLWriter { private static String xmlPath = "src//com//zc//homeWork18//MyXml.xml"; public static void getFamilyMemebers() { /* * 創建文件工廠實例*/ DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); // 如果創建的解析器在解析XML文檔時必須刪除元素內容中的空格，則為true，否則為false dbf.setIgnoringElementContentWhitespace(true); try { /* * 創建文件對象*/ DocumentBuilder db = dbf.newDocumentBuilder();// 創建解析器，解析XML文檔Document doc = db.parse(xmlPath); // 使用dom解析xml文件/* * 歷遍列表，進行XML文件的數據提取*/ // 根據節點名稱來獲取所有相關的節點NodeList sonlist = doc.getElementsByTagName("son"); for (int i = 0; i < sonlist.getLength(); i++) // 循環處理對象{ // 節點屬性的處理Element son = (Element) sonlist.item(i); // 循環節點son內的所有子節點for (Node node = son.getFirstChild(); node != null; node = node .getNextSibling()) { // 判斷是否為元素節點if (node.getNodeType() == Node.ELEMENT_NODE) { String name = node.getNodeName(); String value = node.getFirstChild().getNodeValue(); System.out.println(name + " : " + value); } } } } catch (Exception e) { System.out.println(e.getMessage()); } } // 修改public static void modifySon() { // 創建文件工廠實例DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setIgnoringElementContentWhitespace(true); try { // 從XML文檔中獲取DOM文檔實例DocumentBuilder db = dbf.newDocumentBuilder(); // 獲取Document對象Document xmldoc = db.parse(xmlPath); // 獲取根節點Element root = xmldoc.getDocumentElement(); // 定位id為001的節點Element per = (Element) selectSingleNode("/father/son[@id='001']", root); // 將age節點的內容更改為28 per.getElementsByTagName("age").item(0).setTextContent("28"); // 保存TransformerFactory factory = TransformerFactory.newInstance(); Transformer former = factory.newTransformer(); former.transform(new DOMSource(xmldoc), new StreamResult(new File( xmlPath))); } catch (Exception e) { System.out.println(e.getMessage()); } } // 獲取目標節點，進行刪除，最後保存public static void discardSon() { DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setIgnoringElementContentWhitespace(true); try { DocumentBuilder db = dbf.newDocumentBuilder(); Document xmldoc = db.parse(xmlPath); // 獲取根節點Element root = xmldoc.getDocumentElement(); // 定位根節點中的id=002的節點Element son = (Element) selectSingleNode("/father/son[@id='002']", root); // 刪除該節點root.removeChild(son); // 保存TransformerFactory factory = TransformerFactory.newInstance(); Transformer former = factory.newTransformer(); former.transform(new DOMSource(xmldoc), new StreamResult(new File( xmlPath))); } catch (Exception e) { System.out.println(e.getMessage()); } } // 新增節點public static void createSon() { // 創建文件工廠實例DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setIgnoringElementContentWhitespace(false); try { DocumentBuilder db = dbf.newDocumentBuilder(); // 創建Document對象Document xmldoc = db.parse(xmlPath); // 獲取根節點Element root = xmldoc.getDocumentElement(); // 創建節點son，設置對應的id為004 Element son = xmldoc.createElement("son"); son.setAttribute("id", "004"); // 創建節點name Element name = xmldoc.createElement("name"); name.setTextContent("小兒子"); son.appendChild(name); // 創建節點age Element age = xmldoc.createElement("age"); age.setTextContent("0"); son.appendChild(age); // 把son添加到根節點中root.appendChild(son); // 保存TransformerFactory factory = TransformerFactory.newInstance(); Transformer former = factory.newTransformer(); former.transform(new DOMSource(xmldoc), new StreamResult(new File( xmlPath))); } catch (Exception e) { System.out.println(e.getMessage()); } } // 修改節點信息public static Node selectSingleNode(String express, Element source) { Node result = null; //創建XPath工廠XPathFactory xpathFactory = XPathFactory.newInstance(); //創建XPath對象XPath xpath = xpathFactory.newXPath(); try { result = (Node) xpath.evaluate(express, source, XPathConstants.NODE); System.out.println(result); } catch (XPathExpressionException e) { System.out.println(e.getMessage()); } return result; } // 打印public static void main(String[] args) { getFamilyMemebers(); System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"); modifySon(); System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"); System.out.println("修改數據"); getFamilyMemebers(); System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"); discardSon(); System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"); System.out.println("刪除數據"); getFamilyMemebers(); System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"); createSon(); System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"); System.out.println("添加數據"); getFamilyMemebers(); }}XML文件
<?xml version="1.0" encoding="UTF-8" standalone="no"?><father> <son id="001"> <name>老大</name> <age>20</age> </son> <son id="002"> <name>老二</name> <age>18</age> </son> <son id="003"> <name>老三</name> <age>13</age> </son></father>
總結
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