saxecho.java

JAVA内嵌XML代码的几个小程序

package xmlp;

import org.xml.sax.helpers.*;
import org.xml.sax.Attributes;
import static java.lang.System.out;
import java.util.HashMap;
import org.xml.sax.SAXException;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.SAXParser;


public class SAXEcho extends DefaultHandler {
    StringBuffer sb=new StringBuffer();
    HashMap pre=new HashMap();

    @Override
    public void startDocument(){
        out.print("<?xml version=\"1.0\" ?>");
    }
    @Override
    public void endElement(String uri,String localName,String qName){
        String en=localName;
        if(en.equals("")) en = qName;
            out.print("</"+en+">");
    }

    @Override
    public void startElement(String uri,String localName,String qName,Attributes atts){
        String en=localName;
        if(en.equals("")) en=qName;
        out.print("<" +en);
        if(sb.length()>0) {
            out.println(sb.toString());
            sb=new StringBuffer();
        }
        if(atts !=null) {
            int len=atts.getLength();
            for(int i=0;i<len;i++){
                String an=atts.getLocalName(i);
                if(an.equals("")) an=atts.getQName(i);
                String u=atts.getURI(i);
                String prefix=(String)pre.get(u);
                if(prefix !=null) an=prefix+":" +an;
                out.print(" "+an+"=\""+atts.getValue(i)+"\"");
            }
            out.print(">");
        }
    }
    @Override
    public void characters(char[] ch,int start,int length){
        out.print(new String(ch,start,length));
    }
    public void startPrefixMapping(String prefix,String uri){
        pre.put(uri,prefix);
        String ns=" xmlns";
        if(!"".equals(prefix)) ns=ns+":"+prefix;
        ns=ns+"=\"" +uri+ "\"";
        sb.append(ns);
    }
    public static void main(String[] args){
        try{
            SAXParserFactory spf=SAXParserFactory.newInstance();
            spf.setValidating(true);
            SAXParser parser=spf.newSAXParser();
            DefaultHandler handler=new SAXEcho();
            parser.parse(args[0],handler);

        }catch(SAXException ex){
            ex.printStackTrace();
        }catch(ParserConfigurationException ex){
            ex.printStackTrace();
        }catch(IOException ex){
            ex.printStackTrace();
        }

    }
}