关于SAXException异常

    在使用SAX处理解析过程中出现的错误，当发生致命的错误时，应用抛出一个SAXException对象给解析器，解析
    器将停止parse方法的执行。
    实际上，DefaultHandler类中的方法都可以抛出一个SAXException对象给解析器，比如，事件处理器在调用
    startDocument()方法时，突然决定终止解析文件，就可以抛出一个SAXException对象给解析器，解析器停止
    parse方法的 执行，不再报告任何事件给事件处理器。

一个完整的例子
example.xml:

< ?xml version="1.0" ?>
< guest>
    < spent name="weng">1213< /spent> 
    < spent name="li">3213< /spent>
    < spent name="rui">213< /spent>
    < spent name="weng">6213< /spent>
    < spent name="weng">2088< /spent>
    < spent name="zhang">1013< /spent>
< /guest>

< !--========SaxXml.java============== -->

import java.io.File;
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.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class SaxOne extends DefaultHandler {
    public static int count = 0 ;
 
    public static void main(String[] args){
               File file = new File("I:\\JAVA\\Eclipse\\XmlDemo\\ch5-3.xml");  
               SAXParserFactory saxFactory = SAXParserFactory.newInstance();
               try {
                     SAXParser parser = saxFactory.newSAXParser();    
                     parser.parse(file,new SaxOne());    
               } catch (ParserConfigurationException e) {
                     e.printStackTrace();
               } catch (SAXException e) {
                     e.printStackTrace();
               } catch (IOException e){
                     e.printStackTrace();
               }
               System.out.println("\n事件处理器处理了"+ count +"个事件");
    }
 
    public void startDocument()  throws SAXException{
               System.out.println("开始解析XML文件");
               count ++;
    }
    public void startElement(String uri,String localName,String qName,Attributes attributes)
    throws SAXException{
               System.out.print("< "+qName+">");
               count++;
    }
    public void endDocument() throws SAXException{
               System.out.println();
               System.out.println("结束解析XML文件");
               count ++;
    }
    public void endElement(String uri, String localName, String qName) throws SAXException{
               System.out.print("< /" + qName + ">");
               count ++;
    }
    public void characters(char[] ch,int start,int length) throws SAXException{
               System.out.print(new String(ch,start,length));
               count ++;  
    }
    public void processingInstruction(String target, String data) throws SAXException{
               System.out.println("处理指令的目标是" + target);
               System.out.println("处理指令的内容是" + data);
    }
    public void setDocumentLocator(Locator locator){
               System.out.println(locator.getColumnNumber() + ":" + locator.getLineNumber());
    }
}