解析rss格式的xml文件

package util; 

import java.util.Vector; 

import module.News; 

import org.w3c.dom.Document; 
import org.w3c.dom.Element; 
import org.w3c.dom.Node; 
import org.w3c.dom.NodeList; 

public class ParseXml { 
    Vector n = new Vector(); 

    public Vector parseXml(Document d) { 
        Element rootElement = d.getDocumentElement(); 
        rootElement.normalize(); 
        displayNode(rootElement, 0); 
        return n; 
    } 

    private void displayNode(Node node, int depth) { 

        if (node.getNodeType() == Node.ELEMENT_NODE) { 
            NodeList childNodes = node.getChildNodes(); 
            int numChildren = childNodes.getLength(); 

            if (node.getNodeName().equals("item")) { 
                NodeList child = node.getChildNodes(); 
                int a = child.getLength(); 
                String title = ""; 
                String body = ""; 
                String time = ""; 
                for (int j = 0; j < a; j++) { 
                    String s; 
                    String tagname = null; 
                    try { 
                        tagname = child.item(j).getNodeName(); 
                        s = child.item(j).getFirstChild().getNodeValue(); 
                    } catch (Exception e) { 
                        s = ""; 
                    } 
                    if (tagname.equals("title")) { 
                        title = s; 
                        continue; 
                    } 
                    if (tagname.equals("description")) { 
                        body = s; 
                        continue; 
                    } 
                    if (tagname.equals("pubDate")) { 
                        time = s; 
                        continue; 
                    } 

                } 

                News news = new News(title, time, body); 
                n.addElement(news);//保存到vector中 
            } else { 

                for (int i = 0; i < numChildren; ++i) { 
                    displayNode(childNodes.item(i), depth + 1); 
                } 
            } 

        } 
    } 

}