Book.xml
<?xml version="1.0" encoding="UTF-8" standalone="no"?><书架>
<书 name="yyy">
<售价>666</售价>
<售价>39</售价><书名>java就业培训</书名>
<作者>粑粑</作者>
<售价>233</售价></书>
</书架>
package sax;
import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
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;
public class Demo1 {
/**
* SAX方式解析book.xml
* @throws SAXException
* @throws ParserConfigurationException
* @throws IOException
*/
public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
//1. 创建工厂
SAXParserFactory factory = SAXParserFactory.newInstance();
//2. 用工厂创建解析器
SAXParser sp = factory.newSAXParser();
//3. 利用解析器得到reader
XMLReader reader = sp.getXMLReader();
//4. 在解析xml文档之前,设置好时间处理器
reader.setContentHandler(new MyContentHandler2());
//5. 利用reader读取xml文档
reader.parse("src/book.xml");
}
}
//得到xml文档内容的事件处理器
class MyContentHandler implements ContentHandler{
@Override
public void setDocumentLocator(Locator locator) {
// TODO Auto-generated method stub
}
@Override
public void startDocument() throws SAXException {
// TODO Auto-generated method stub
}
@Override
public void endDocument() throws SAXException {
// TODO Auto-generated method stub
}
@Override
public void startPrefixMapping(String prefix, String uri) throws SAXException {
// TODO Auto-generated method stub
}
@Override
public void endPrefixMapping(String prefix) throws SAXException {
// TODO Auto-generated method stub
}
@Override
public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
// TODO Auto-generated method stub
System.out.println("当前解析到了:"+qName+",这个标签是开始标签");
for(int i = 0; i < atts.getLength(); i ++) {
String attName = atts.getQName(i);
String attValue = atts.getValue(i);
System.out.println(attName+" "+attValue);
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
// TODO Auto-generated method stub
System.out.println("当前解析到了:"+qName+",这个标签是结束标签");
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
// TODO Auto-generated method stub
System.out.println("当前解析到了内容:"+new String(ch,start,length));
}
@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 skippedEntity(String name) throws SAXException {
// TODO Auto-generated method stub
}
}
//用于获取第一个售价节点的值:<售价》666</售价>
class MyContentHandler2 extends DefaultHandler{
private boolean isOk = false;
private int index = 1;
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
if(qName.equals("售价")&&index==1) {
isOk = true;
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
if(qName.equals("售价")) {
isOk = false;
index++;
}
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
if(isOk==true) {
System.out.println(new String(ch, start, length));
}
}
}