JAXDemo

package javawebserivce;
import java.io.*;
import java.util.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
public class JAXPDemo extends DefaultHandler
{
private Hashtable tags;
public void startDocument() throws SAXException
{
tags=new Hashtable();
}
public void startElement
(String namespaceURI,String localName,
String keyName,Attributes atts) throws SAXException
{
String key=keyName;
Object value=tags.get(key);
//若哈希表中没有此元素则添加此元素
if(value==null)
{
tags.put(key,new Integer(1));
}
//若已经有此元素则元素数量自增
else
{
int count=((Integer)value).intValue();
count++;
tags.put(key,new Integer(count));
}
}
public void endDocument() throws SAXException
{
Enumeration keys=tags.keys();
//XML文档解析结束时打印所有标签出现次数
while(keys.hasMoreElements())
{
String tag=(String)keys.nextElement();
int count=((Integer)tags.get(tag)).intValue();
System.out.println("Tag<"+tag+"> occurs "+count+" times ");
}
}
//将File转化成URL
private static String convertToFileURL(String fileName)
{
String path=new File(fileName).getAbsolutePath();
if(File.separatorChar!='/')
{
path=path.replace(File.separatorChar,'/');
}
if(!path.startsWith("/"))
{
path="/"+path;
}
return "file:"+path;
}
private static void usage()
{
System.out.println("Usage:JAXPDemo [-v] <filename>");
System.out.println(" -v=validation");
System.exit(1);
}
public static void main(String[] args)
{
String fileName=null;
boolean validation=false;
for(int i=0;i<args.length;i++)
{
if(args[i].equals("-v"))
{
validation=true;
}
else
{
fileName=args[i];
if(i!=args.length-1)
{
usage();
}
}
if(fileName==null)
{
usage();
}
//创建SAXParserFactory实例
SAXParserFactory factory=SAXParserFactory.newInstance();
factory.setValidating(validation);
//创建XMLReader实例
XMLReader xmlReader=null;
try
{
SAXParser saxParser=factory.newSAXParser();
xmlReader=saxParser.getXMLReader();
}
catch(Exception e)
{
System.out.println(e.toString());
System.exit(1);
}
//设置XMLReader的内容处理
xmlReader.setContentHandler(new JAXPDemo());
//设置XMLReader的错误处理
xmlReader.setErrorHandler(new MyErrorHandler(System.out));
try
{
//解析XML文件
xmlReader.parse(convertToFileURL(fileName));
}
catch(SAXException se)
{
System.out.println(se.toString());
System.exit(1);
}
catch(IOException ioe)
{
System.out.println(ioe.toString());
System.exit(1);
}
}
}
private static class MyErrorHandler implements ErrorHandler
{
private PrintStream out;
MyErrorHandler(PrintStream out)
{
this.out=out;
}
private String getParseExceptionInfo(SAXParseException spe)
{
String systemID=spe.getSystemId();
if(systemID==null)
{
systemID="null";
}
String info="URI="+systemID+"Line="+spe.getLineNumber()+
":"+spe.getMessage();
return info;
}
public void warning(SAXParseException spe) throws SAXException
{
out.println("Waring:"+getParseExceptionInfo(spe));
}
public void error(SAXParseException spe) throws SAXException
{
String message="Error:"+getParseExceptionInfo(spe);
throw new SAXException(message);
}
public void fatalError(SAXParseException spe) throws SAXException
{
String message="Fatal Error:"+getParseExceptionInfo(spe);
throw new SAXException(message);
}
}
}