xml 树状显示

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xml文件树状显示，dom解析

效果如下：

代码如下：

import javax.xml.parsers.*;

import org.w3c.dom.*;
import java.io.*;
public class TreeXml
{
   private   int []is=new int[20] ;

   public void walkNode(Node node,int n)
   {
       NodeList nodeList=node.getChildNodes();
       int len=nodeList.getLength();
       is[n+1]=(len-1)/2;
       switch(node.getNodeType())
       {
           case Node.DOCUMENT_NODE:
               printName(node,n);
               nodeList=node.getChildNodes();
               n++;
               for(int i=0;i<nodeList.getLength();i++)
                   walkNode(nodeList.item(i),n);
               break;
           case Node.ELEMENT_NODE:
               nodeList=node.getChildNodes();
               if(nodeList.getLength()>1)
               {
                   printName(node,n);
                   n++;
                   for(int i=0;i<nodeList.getLength();i++)
                       walkNode(nodeList.item(i),n);
               }
               else
                   printNameValue(node,n);
               break;
           default:break;
       }
       is[n]--;
       n--;
   }
   public void printNameValue(Node node,int n)
   {
       for(int i=0;i<n;i++)
           System.out.print(is[i]>0?" | ":"   ");
       System.out.println(" |--"+node.getNodeName()+":"+node.getFirstChild().getNodeValue());
   }
   public void printName(Node node,int n)
   {
       for(int i=0;i<n;i++)
           System.out.print(is[i]>0?" | ":"   ");
       System.out.println(" |--"+node.getNodeName());
   }
   public static void main(String[]args)
   {

       if(args.length<1)
       {
           System.out.println("参数错误！");
           System.exit(1);
       }
       System.out.println(args[0]);
       try
       {
           DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
           DocumentBuilder builder=factory.newDocumentBuilder();
           Document doc=builder.parse(new File(args[0]));
           new TreeXml().walkNode(doc.getDocumentElement(),1);
       }catch(Exception e)
       {
           System.out.println("错误"+e.getMessage());
       }
       System.exit(0);
   }
}