package my.test;

import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class uDom {    

    Document doc=null;
    
    public uDom(String xmlfile) {
        DocumentBuilder dbf;
        try {
            dbf = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            doc = dbf.parse(xmlfile);
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }        
    }
    
    /**
     * 读取XML文件节点内容
     * @param nodeName 节点名称
     * @return
     */
    public Object[] readNode(String nodeName) {
        Object nodeValue[]=null;
        NodeList nodelist = doc.getElementsByTagName(nodeName);
        nodeValue=new Object[nodelist.getLength()];
        //System.out.println("getLength:" + nodelist.getLength());
        //System.out.println("getNodeName"+"\t"+"getNodeValue"+"\t"+"getAttribute");
        for (int i = 0; i < nodelist.getLength(); i++) {
            Element element =(Element)nodelist.item(i);
            //System.out.println(element.getNodeName()+"\t"+element.getNodeValue()+"\t"+element.getAttribute("num"));
            nodeValue[i]=element.getNodeValue();
        }
        return nodeValue;
    }
    
    /**
     * 读取XML文件节点属性内容
     * @param nodeName 节点名称
     * @param Attribute 节点属性名称
     * @return
     */
    public Object[] readNode(String nodeName,String Attribute) {
        Object AttrValue[]=null;
        NodeList nodelist = doc.getElementsByTagName(nodeName);
        AttrValue=new Object[nodelist.getLength()];
        for (int i = 0; i < nodelist.getLength(); i++) {
            Element element =(Element)nodelist.item(i);
            //System.out.println(element.getNodeName()+"\t"+element.getNodeValue()+"\t"+element.getAttribute("num"));
            AttrValue[i]=element.getAttribute(Attribute);
        }
        return AttrValue;
    }
    
    public uDom() {
        // TODO Auto-generated constructor stub
        try {
            this.readxml();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void readxml() throws ParserConfigurationException, SAXException,
            IOException {
        
        String nodename = null;

        short nodetype = 0;

        String nodevalue = null;
        
        DocumentBuilder dbf = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        System.out.println("Get DocumentBuilder Successful...");

        Document doc = dbf.parse("d:/TestFile/links.xml");
        System.out.println("Get Document Successful...");

        NodeList nl1 = doc.getElementsByTagName("message");
        System.out.println("Get NodeList(links) Successful...");
        System.out.println("getLength:" + nl1.getLength());

        Node node2 = doc.getFirstChild().getChildNodes().item(1);
        // Node node3 = doc.getFirstChild();
        Node node1 = nl1.item(4);
        // Node node2 = doc.getFirstChild();

        // Node node3 = node2.getFirstChild();
        // Node node4 = node3.getFirstChild();
        for (int i = 0; i < 2; i++) {
            System.out.println(node2.getChildNodes().item(i).getNodeName());
            System.out.println(node2.getChildNodes().item(i).getNodeValue());
        }

        // System.out.println(node2.getFirstChild().getNextSibling().getNodeName());
        System.exit(0);

        nodename = node1.getFirstChild().getNodeName();

        nodetype = node1.getFirstChild().getNodeType();

        nodevalue = node1.getFirstChild().getNodeValue();

        System.out.println("getNodeName:" + nodename);
        System.out.println("getNodeType:" + nodetype);
        System.out.println("getNodeValue:" + nodevalue);
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        uDom udom = new uDom("xml/test.XML");
        System.out.println("读取XML文件成功~~");
        Object[] temp=udom.readNode("root","num");
        System.out.println("获得节点长度为:"+temp.length);
        for(int i=0;i<temp.length;i++) {
            //temp[i]可能会得到空指针异常
            System.out.println(i+" Value: "+temp[i].toString());
        }
    }

}