org.w3c.dom處理xml的常用方法

import java.io.File;

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

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

public class DomTest1
{
    public static void main(String[] args) throws Exception
    {
        // step 1: 獲得dom解析器工廠（工作的作用是用於創建具體的解析器）
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

//      System.out.println("class name: " + dbf.getClass().getName());

        // step 2:獲得具體的dom解析器
        DocumentBuilder db = dbf.newDocumentBuilder();

//      System.out.println("class name: " + db.getClass().getName());

        // step3: 解析一個xml文檔，獲得Document對象（根結點）
        Document document = db.parse(new File("candidate.xml"));

        NodeList list = document.getElementsByTagName("PERSON");

        for(int i = 0; i < list.getLength(); i++)
        {
            Element element = (Element)list.item(i);

            String content = element.getElementsByTagName("NAME").item(0).getFirstChild().getNodeValue();

            System.out.println("name:" + content);

            content = element.getElementsByTagName("ADDRESS").item(0).getFirstChild().getNodeValue();

            System.out.println("address:" + content);

            content = element.getElementsByTagName("TEL").item(0).getFirstChild().getNodeValue();

            System.out.println("tel:" + content);

            content = element.getElementsByTagName("FAX").item(0).getFirstChild().getNodeValue();

            System.out.println("fax:" + content);

            content = element.getElementsByTagName("EMAIL").item(0).getFirstChild().getNodeValue();

            System.out.println("email:" + content);

            System.out.println("--------------------------------------");
        }
    }
}

import java.io.File;

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

import org.w3c.dom.Attr;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * 使用遞歸解析給定的任意一個xml文檔並且將其內容輸出到命令行上
 * @author zhanglong
 *
 */
public class DomTest3
{
    public static void main(String[] args) throws Exception
    {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();

        Document doc = db.parse(new File("student.xml"));
        //獲得根元素結點
        Element root = doc.getDocumentElement();

        parseElement(root);
    }

    private static void parseElement(Element element)
    {
        String tagName = element.getNodeName();

        NodeList children = element.getChildNodes();

        System.out.print("<" + tagName);

        //element元素的所有屬性所構成的NamedNodeMap對象，需要對其進行判斷
        NamedNodeMap map = element.getAttributes();

        //如果該元素存在屬性
        if(null != map)
        {
            for(int i = 0; i < map.getLength(); i++)
            {
                //獲得該元素的每一個屬性
                Attr attr = (Attr)map.item(i);

                String attrName = attr.getName();
                String attrValue = attr.getValue();

                System.out.print(" " + attrName + "=\"" + attrValue + "\"");
            }
        }

        System.out.print(">");

        for(int i = 0; i < children.getLength(); i++)
        {
            Node node = children.item(i);
            //獲得結點的類型
            short nodeType = node.getNodeType();

            if(nodeType == Node.ELEMENT_NODE)
            {
                //是元素，繼續遞歸
                parseElement((Element)node);
            }
            else if(nodeType == Node.TEXT_NODE)
            {
                //遞歸出口
                System.out.print(node.getNodeValue());
            }
            else if(nodeType == Node.COMMENT_NODE)
            {
                System.out.print("<!--");

                Comment comment = (Comment)node;

                //註釋內容
                String data = comment.getData();

                System.out.print(data);

                System.out.print("-->");
            }
        }

        System.out.print("</" + tagName + ">");
    }
}