Android中對(duì)xml文件解析的3種方式總結(jié)

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <書(shū) 出版社="駿馬">
 <書(shū)名>如何成功</書(shū)名>
 <作者>uniapp</作者>
 <售價(jià)>666</售價(jià)>
 </書(shū)>
 <書(shū)>
 <書(shū)名>如何成功1</書(shū)名>
 <作者>uniapp</作者>
 <售價(jià)>1991</售價(jià)>
 </書(shū)>
</書(shū)架>

public class SaxDemo {
 @Test
 public void main() throws ParserConfigurationException, SAXException, IOException{
 //工廠類實(shí)例
 SAXParserFactory fac = SAXParserFactory.newInstance();
 //創(chuàng)建解析器
 SAXParser parser = fac.newSAXParser();
 //解析文檔
 XMLReader reader = parser.getXMLReader();
 reader.setContentHandler(new MyDefultHandle());
 reader.parse("./app/src/main/java/test/DTD.xml");

 }
}

class MyDefultHandle extends DefaultHandler{

 @Override
 public void startDocument() throws SAXException {
 super.startDocument();

 System.out.println("文檔開(kāi)始");
 }

 @Override
 public void endDocument() throws SAXException {
 super.endDocument();
 System.out.println("文檔結(jié)束");
 }

 private boolean isPrice = false;
 @Override
 public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
 super.startElement(uri, localName, qName, attributes);
 System.out.println("元素開(kāi)始: " + qName);

 }

 @Override
 public void endElement(String uri, String localName, String qName) throws SAXException {
 super.endElement(uri, localName, qName);

 if ("售價(jià)".equals(qName)){
  isPrice = false;
 }
 System.out.println("元素結(jié)束: " + qName);

 }

 @Override
 public void characters(char[] ch, int start, int length) throws SAXException {
 super.characters(ch, start, length);
 if (isPrice){
  System.out.println("內(nèi)容: " + new String(ch, start, length));
 }
 }
}

/**
 * 讀取屬性值
 * */
 public void readAttr() throws DocumentException {
 Document doc = getDocument();
 List<Element> list = doc.getRootElement().elements("書(shū)");
 for (int i = 0; i < list.size(); i++) {
  Element el = (Element) list.get(i);
  Attribute att = el.attribute("出版社");
  System.out.print("結(jié)果: " + att.getName() + att.getValue());
 }
 }

 /**
 * 讀取節(jié)點(diǎn)
 * */
 public void read() throws DocumentException {
 /**
  * 不能越級(jí)獲取值
  * */
 Document doc = getDocument();
 org.dom4j.Element el = doc.getRootElement();
 Element firstEl = el.element("書(shū)");
 Element firstBookEl = firstEl.element("書(shū)名");

 String name = firstBookEl.getText();
 System.out.println("書(shū)名: " + name);
 }

 public void update() throws DocumentException, IOException {
 Document doc = getDocument();
 List<Element> list = doc.getRootElement().elements("書(shū)");
 Element element = list.get(0);
 Element priceEl = element.element("售價(jià)");
 priceEl.setText("888元");
 XMLWriter writer = new XMLWriter(new FileOutputStream("./app/src/main/java/test/Dom4j3.xml"));
 writer.write(doc);
 }

 /**
 * 刪除節(jié)點(diǎn)
 * */
 public void deletePrice() throws Exception{
 SAXReader reader = new SAXReader();
 Document doc = reader.read("./app/src/main/java/test/Dom4j1.xml");
 Element el = (Element) doc.getRootElement().elements("書(shū)").get(1);
 Element elPrice = (Element) el.elements("售價(jià)").get(1);
 elPrice.getParent().remove(elPrice);
 XMLWriter writer = new XMLWriter(new FileOutputStream("./app/src/main/java/test/Dom4j2.xml"));
 writer.write(doc);
 writer.close();
 }
 /**
 * 增加節(jié)點(diǎn)
 * */
 public void addEl() throws DocumentException, IOException {
 Document doc = getDocument();
 Element el = (Element) doc.getRootElement().elements("書(shū)").get(1);
 el.addElement("售價(jià)").setText("6.66元");
 XMLWriter writer = new XMLWriter(new FileOutputStream("./app/src/main/java/test/Dom4j1.xml"));
 writer.write(doc);
 writer.close();
 }

 private Document getDocument() throws DocumentException {
 SAXReader reader = new SAXReader();
 return reader.read("./app/src/main/java/test/DTD.xml");
 }