SAX解析XML文档

package com.bird.sax; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.xml.sax.Attributes; import org.xml.sax.ContentHandler; import org.xml.sax.Locator; import org.xml.sax.SAXException; import org.xml.sax.XMLReader; import org.xml.sax.helpers.DefaultHandler; /** * @use SAX解析 * @author Bird * */ public class XmlReader { public static void main(String [] args) throws Exception{ // 获得工厂 SAXParserFactory factory = SAXParserFactory.newInstance(); //获得解析器 SAXParser sp = factory.newSAXParser(); //获取读取器 XMLReader reader = sp.getXMLReader(); //设置内容处理器 reader.setContentHandler(new ValuesHandle()); //读取XML文档的内容 reader.parse("d://book.xml"); } } class ValuesHandle extends DefaultHandler{//只解析作者的名字 private String currentTag ;//记住当前想要解析的标签 private int needNumber = 2;//记住你想要的标签的位置 private int currentNumber; //当前解析的是第几个 @Override public void characters(char[] ch, int start, int length) throws SAXException { if("作者".equals(currentTag) && currentNumber == needNumber){ System.out.println(new String(ch,start,length)); } } @Override public void endElement(String uri, String localName, String qName) throws SAXException { currentTag = null; } @Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { currentTag = qName; if(currentTag.equals("作者")){ currentNumber++; } } } class ListHandle implements ContentHandler{ @Override public void characters(char[] ch, int start, int length) throws SAXException { System.out.println(new String(ch,start,length)); } @Override public void endDocument() throws SAXException { // TODO Auto-generated method stub } @Override public void endElement(String uri, String localName, String qName) throws SAXException { // TODO Auto-generated method stub } @Override public void endPrefixMapping(String prefix) throws SAXException { // TODO Auto-generated method stub } @Override public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException { // TODO Auto-generated method stub } @Override public void processingInstruction(String target, String data) throws SAXException { // TODO Auto-generated method stub } @Override public void setDocumentLocator(Locator locator) { // TODO Auto-generated method stub } @Override public void skippedEntity(String name) throws SAXException { // TODO Auto-generated method stub } @Override public void startDocument() throws SAXException { // TODO Auto-generated method stub } @Override public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException { System.out.println("<" + qName + ">"); for(int i = 0; atts != null && i < atts.getLength(); i++){//注意这种写法 String name = atts.getQName(i); String values = atts.getValue(i); System.out.println(name + " " + values); } } @Override public void startPrefixMapping(String prefix, String uri) throws SAXException { // TODO Auto-generated method stub } }