listdom.java

jsp数据库编程入门

import javax.xml.parsers.*;
import org.xml.sax.*;  
import java.io.*;
import org.w3c.dom.*;

public class ListDOM
{
    //声明XML文件
    static Document document; 
    public static void main(String[] args) throws Exception 
    {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        // 设定解析的叁数
        dbf.setIgnoringComments(true);
        dbf.setIgnoringElementContentWhitespace(true);
        DocumentBuilder db = dbf.newDocumentBuilder();
        //导入XML文件
        document = db.parse(new File("08_01.xml"));
        // 获取根元素
        Node root = document.getDocumentElement();
        System.out.println("根元素: " + root.getNodeName());
        NodeList nodes = root.getChildNodes();
        // 获取所有的子节点
        for (int i=0; i < nodes.getLength(); i++) 
        { 
           // 元素和文字节点
           System.out.println("元素: " + nodes.item(i).getNodeName());
           if (nodes.item(i).hasChildNodes()) 
           {
              NodeList childs = nodes.item(i).getChildNodes();
              // 显示所有子节点
              for (int j=0; j < childs.getLength(); j++) 
              {
                  int type1 = childs.item(j).getNodeType();
                  if (type1 == Node.ELEMENT_NODE) 
                  {
                     System.out.print("   +-- " + childs.item(j).getNodeName()); 
                     System.out.println("/" + childs.item(j).getFirstChild().getNodeValue());
                     NodeList grandchilds = childs.item(j).getChildNodes();
                     for (int k=0; k < grandchilds.getLength(); k++) 
                     {
                     	int type2 = grandchilds.item(k).getNodeType();
                        if (type2 == Node.ELEMENT_NODE) 
                        {
                        	System.out.print("      +-- " + grandchilds.item(k).getNodeName()); 
                            System.out.println("/" + grandchilds.item(k).getFirstChild().getNodeValue());
                        }
                    }
                  } 
              }
           }
        }
        // 显示指定元素的属性值
        NodeList tagNodes = document.getElementsByTagName("book");
        for (int i=0; i< tagNodes.getLength(); i++) 
        {
            System.out.println("book(" + i + "):");
            NamedNodeMap atts = tagNodes.item(i).getAttributes();
            for (int j = 0; j < atts.getLength(); j++) 
            {
                Node att = atts.item(j);
                System.out.print("   +-- " + att.getNodeName()); 
                System.out.println("/" + att.getNodeValue());
            }
        }
    }
}