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我编写了这段代码来解析 XML 文件。我想以树（根、子、孙子）的形式打印 o/p。但是它将每个节点（子节点和孙节点）打印为根节点的子节点。

import java.io.File;
import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;

public class Parsing{

public static void traverse (Node n) throws Exception
{
    // Extract node info:
    String TextNode = "TextNode";
    String AttrVal = "";
    int ind;
    String nodename = n.getNodeName();
    String valueStr = n.getNodeValue();
    Boolean bo = n.hasAttributes();

    String xml1 = "";

    if (valueStr != null)
        valueStr = valueStr.trim();
    // Print and continue traversing.
    if(!nodename.equals("#text"))
    {
        if(bo==true)
        {
            NamedNodeMap nm1 = n.getAttributes();
            if(valueStr==null)//If node has no value
                System.out.println(""+ n.getNodeName());
            else 
                System.out.println( "" + n.getNodeName() + "  Value = " + valueStr + " " );
                System.out.println( "\t\tAttributes: ");
            for(int i = 0 ; i<nm1.getLength() ; i++)
            {
                Attr attribute = (Attr)nm1.item(i);     
                AttrVal = attribute.getValue();
                ind = AttrVal.indexOf(":");
                ind++;
                System.out.println( "\t\t\t"  + attribute.getName()+" = "+attribute.getValue());


         }

        {
            if(valueStr==null)
                System.out.println (" " + n.getNodeName() );
            else
                System.out.println (" " + n.getNodeName() + "  Value = " + valueStr + " ");
        }   
    }
    else
    {
        if(!valueStr.equals(""))
        System.out.println (" "  + TextNode + "  Value = " + valueStr + " ");
    }    

    // Now traverse the rest of the tree in depth-first order.
    if (n.hasChildNodes()) 
    {
      // Get the children in a list.
      NodeList nl = n.getChildNodes();
      // No. of children
      int size = nl.getLength();
      for (int i=0; i<size; i++)
      // Recursively traverse each of the children.
      traverse (nl.item(i));
    }
}

public static void parse (String a1){
try 
    {
            System.out.println("Name"   +  a1);
            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
            Document doc = docBuilder.parse (new File(a1));
            // normalize text representation
            doc.getDocumentElement ().normalize ();
            System.out.println ("Root element of the doc is " + doc.getDocumentElement().getNodeName());            
            Element root = doc.getDocumentElement();
            System.out.println("ROOT ELEMENT IS" + root);
            traverse (root);
    }

catch (Throwable t) 
    {
        t.printStackTrace ();
    }
 }
}
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1 回答 1

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在方法遍历中添加参数int depth：

public static void traverse (Node n, int depth) throws Exception

并在每次遍历节点的子节点时递增该值：

traverse(root,0);

和

traverse(nl.item(i),depth+1);

最后，根据 depth 的值修改您的打印语句以缩进。

于 2013-04-02T14:39:22.723 回答