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DOM解析示例
收藏信息.xml
<?xml version="1.0" encoding="GB2312" standalone="no"?><PhoneInfo> <Brand id="0" name="华为"> <Type name="U8650"/> <Type name="HW123"/> <Type name="HW321"/> </Brand> <Brand id="1" name="苹果"> <Type name="iPhone4"/> </Brand> <Brand id="2" name="三星"><type name="s120"/></Brand></PhoneInfo>
解析示例:
import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; 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 ParseXml { private Document document; //获取DOM树 public void getDom(){ DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder; try { builder = factory.newDocumentBuilder(); document = builder.parse("收藏信息.xml"); } catch (ParserConfigurationException e) { e.printStackTrace(); } catch (SAXException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } //遍历XML信息 public void showInfo(){ NodeList nodes = document.getElementsByTagName("Brand"); for(int i=0;i<nodes.getLength();i++){ Node node = nodes.item(i); Element ele = (Element)node; String brandName = ele.getAttribute("name"); System.out.println(brandName); NodeList types = ele.getChildNodes(); for(int j=0;j<types.getLength();j++){ Node typeNode = types.item(j); //如果节点是元素节点时再类型转换 if(typeNode.getNodeType() == Node.ELEMENT_NODE){ Element typeEle = (Element)typeNode; String typeName = typeEle.getAttribute("name"); System.out.println(typeName); } } } } //保存XML public void saveXml(String path){ TransformerFactory factory = TransformerFactory.newInstance(); try { //获取解析器 Transformer transformer = factory.newTransformer(); //指定特定的输出格式 transformer.setOutputProperty(OutputKeys.ENCODING, "GB2312"); //源 DOMSource source = new DOMSource(document); //目标 StreamResult result = new StreamResult(new FileOutputStream(path)); //解析 transformer.transform(source, result); } catch (TransformerConfigurationException e) { e.printStackTrace(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (TransformerException e) { e.printStackTrace(); } } //向XML添加节点 public void addEle(){ Element Brand = document.createElement("Brand"); Brand.setAttribute("name", "三星"); Element type = document.createElement("type"); type.setAttribute("name", "s120"); Brand.appendChild(type); document.getElementsByTagName("PhoneInfo").item(0).appendChild(Brand); saveXml("收藏信息.xml"); } //修改XML元素,为每个Brand节点添加一个ID属性,分别为0,1,2 public void updateEle(){ NodeList brand = document.getElementsByTagName("Brand"); for(int i=0;i<brand.getLength();i++){ Node node = brand.item(i); Element ele = (Element)node; ele.setAttribute("id", i+""); } saveXml("收藏信息.xml"); } //删除手机品牌为华为的相关元素 public void deleteEle(){ NodeList brand = document.getElementsByTagName("Brand"); for(int i=0;i<brand.getLength();i++){ Node node = brand.item(i); Element brandEle = (Element)node; if(brandEle.getAttribute("name").equals("华为")){ brandEle.getParentNode().removeChild(brandEle); } } saveXml("收藏信息.xml"); } public static void main(String[] args) { ParseXml px = new ParseXml(); px.getDom(); px.showInfo(); // px.saveXml("wjb.xml"); // px.addEle(); px.updateEle(); px.deleteEle(); } }
DOM解析示例
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