Android中对xml文件解析的3种方式总结

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <书 出版社="骏马">
 <书名>如何成功</书名>
 <作者>uniapp</作者>
 <售价>666</售价>
 </书>
 <书>
 <书名>如何成功1</书名>
 <作者>uniapp</作者>
 <售价>1991</售价>
 </书>
</书架>

public class SaxDemo {
 @Test
 public void main() throws ParserConfigurationException, SAXException, IOException{
 //工厂类实例
 SAXParserFactory fac = SAXParserFactory.newInstance();
 //创建解析器
 SAXParser parser = fac.newSAXParser();
 //解析文档
 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("文档开始");
 }

 @Override
 public void endDocument() throws SAXException {
 super.endDocument();
 System.out.println("文档结束");
 }

 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("元素开始: " + qName);

 }

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

 if ("售价".equals(qName)){
  isPrice = false;
 }
 System.out.println("元素结束: " + qName);

 }

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

/**
 * 读取属性值
 * */
 public void readAttr() throws DocumentException {
 Document doc = getDocument();
 List<Element> list = doc.getRootElement().elements("书");
 for (int i = 0; i < list.size(); i++) {
  Element el = (Element) list.get(i);
  Attribute att = el.attribute("出版社");
  System.out.print("结果: " + att.getName() + att.getValue());
 }
 }

 /**
 * 读取节点
 * */
 public void read() throws DocumentException {
 /**
  * 不能越级获取值
  * */
 Document doc = getDocument();
 org.dom4j.Element el = doc.getRootElement();
 Element firstEl = el.element("书");
 Element firstBookEl = firstEl.element("书名");

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

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

 /**
 * 删除节点
 * */
 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("书").get(1);
 Element elPrice = (Element) el.elements("售价").get(1);
 elPrice.getParent().remove(elPrice);
 XMLWriter writer = new XMLWriter(new FileOutputStream("./app/src/main/java/test/Dom4j2.xml"));
 writer.write(doc);
 writer.close();
 }
 /**
 * 增加节点
 * */
 public void addEl() throws DocumentException, IOException {
 Document doc = getDocument();
 Element el = (Element) doc.getRootElement().elements("书").get(1);
 el.addElement("售价").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");
 }