traversedoc.java

JAVA内嵌XML代码的几个小程序

package xmlp;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import static java.lang.System.*;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Attr;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.IOException;
import javax.xml.parsers.*;
import org.xml.sax.SAXException;


public class TraverseDoc {
    Document doc;
    public TraverseDoc(Document doc) {
        this.doc=doc;
    }
    public void traverse(){
        output(doc,"");
    }
    public void output(Node n,String indent){
        short type=n.getNodeType();
        switch(type){
          case Node.DOCUMENT_NODE:
             out.print("<?xml version='1.0'?>");
             Document doc=(Document)n;
             NodeList nl=doc.getChildNodes();
             if(nl !=null){
                 int len=nl.getLength();
                 for(int i=0;i<len;i++){
                     output(nl.item(i),"");
                 }
             }break;
           case Node.ELEMENT_NODE:
               Element e=(Element)n;
               out.print("<"+e.getNodeName());
               NamedNodeMap attrs=e.getAttributes();
               if(attrs !=null){
                   int len=attrs.getLength();
                   for(int i=0;i<len;i++){
                       output(attrs.item(i),"");
                   }
               }
               out.print(">");
               NodeList enl=e.getChildNodes();
               if(enl !=null){
                   int len=enl.getLength();
                   indent +=" ";
                 for(int i=0;i<len;i++){
                     output(enl.item(i),indent);
                 }
               }
               out.print("</"+ e.getNodeName()+">");
               break;
             case Node.ATTRIBUTE_NODE:
                 Attr atr=(Attr)n;
                 out.print(" "+ atr.getName()+"='" +atr.getNodeValue()+"'");
                 break;
             case Node.TEXT_NODE:
                 out.print(n.getNodeValue());
        }
    }

    public static void main(String... args){
       try{
           DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
           dbf.setValidating(true);
           dbf.setNamespaceAware(true);
           DocumentBuilder db = null;
           db = dbf.newDocumentBuilder();

           Document doc=db.parse(args[0]);
           TraverseDoc td=new TraverseDoc(doc);
           td.traverse();
       }catch(IOException e){
           e.printStackTrace();
       } catch (ParserConfigurationException ex) {
           ex.printStackTrace();
      } catch (SAXException ex) {
            ex.printStackTrace();
        }

    }
}