DOM 实现Xml文档的增加,删除,修改,查询

采用Dom实现Xml 文档的增加，删除，修改，查询

  

<?xml version="1.0" encoding="GB2312" standalone="no"?>
<books>
<book id="1">
<name>数据结构</name>
<author>严蔚敏</author>
</book>
</books>

实现代码：

  

import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

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

import org.w3c.dom.NodeList;

public class DomTest {
    public static void main(String[] args) throws Exception {
        init();
        add();
        traverse();
        edit(1);
        del(2);
    }

    private static void del(int id) throws Exception {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(new File("books.xml"));

        Element root = document.getDocumentElement();
        NodeList list = root.getChildNodes();

        for (int i = 0; i < list.getLength(); i++) {
            Element e = (Element) list.item(i);
            if (Integer.parseInt(e.getAttribute("id")) == id) {

                root.removeChild(e);

                break;
            }

        }
        TransformerFactory tsf = TransformerFactory.newInstance();

        Transformer tf = tsf.newTransformer();

        tf.setOutputProperty(OutputKeys.ENCODING, "GB2312");
        tf.setOutputProperty(OutputKeys.INDENT, "  ");

        StreamResult result = new StreamResult(new File("books.xml"));
        DOMSource source = new DOMSource(document);
        tf.transform(source, result);
    }

    private static void edit(int id) throws Exception {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(new File("books.xml"));

        Element root = document.getDocumentElement();
        NodeList list = root.getChildNodes();

        for (int i = 0; i < list.getLength(); i++) {
            Element e = (Element) list.item(i);
            if (Integer.parseInt(e.getAttribute("id")) == id) {
                e.getElementsByTagName("name").item(0).setTextContent("数据结构");
                e.getElementsByTagName("author").item(0).setTextContent("严蔚敏");
                break;
            }

        }
        TransformerFactory tsf = TransformerFactory.newInstance();

        Transformer tf = tsf.newTransformer();

        tf.setOutputProperty(OutputKeys.ENCODING, "GB2312");
        tf.setOutputProperty(OutputKeys.INDENT, "  ");

        StreamResult result = new StreamResult(new File("books.xml"));
        DOMSource source = new DOMSource(document);
        tf.transform(source, result);

    }

    private static void traverse() throws Exception {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(new File("books.xml"));

        Element root = document.getDocumentElement();
        NodeList list = root.getChildNodes();

        for (int i = 0; i < list.getLength(); i++) {
            Element e = (Element) list.item(i);
            System.out.println("id: " + e.getAttribute("id"));
            System.out.println("书籍名称："
                    + e.getElementsByTagName("name").item(0).getTextContent());
            System.out
                    .println("书籍作者 ："
                            + e.getElementsByTagName("author").item(0)
                                    .getTextContent());
        }

    }

    private static void add() throws Exception {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(new File("books.xml"));

        Element root = document.getDocumentElement();

        Element parent = document.createElement("book");
        Element name = document.createElement("name");
        Element author = document.createElement("author");

        parent.setAttribute("id", "2");
        name.appendChild(document.createTextNode("操作系统"));
        author.setTextContent("汤子赢");

        parent.appendChild(name);
        parent.appendChild(author);
        root.appendChild(parent);




        TransformerFactory tsf = TransformerFactory.newInstance();
        DOMSource source = new DOMSource(document);

        Transformer tf = tsf.newTransformer();
        tf.setOutputProperty(OutputKeys.ENCODING, "GB2312");
        tf.setOutputProperty(OutputKeys.INDENT, "  ");

        StreamResult result = new StreamResult(new File("books.xml"));

        tf.transform(source, result);
    }

    private static void init() throws Exception {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.newDocument();

        Element root = document.createElement("books");
        Element parent = document.createElement("book");
        Element name = document.createElement("name");
        Element author = document.createElement("author");

        parent.setAttribute("id", "1");
        name.appendChild(document.createTextNode("计算机网络"));
        author.setTextContent("谢希仁");

        parent.appendChild(name);
        parent.appendChild(author);
        root.appendChild(parent);
        document.appendChild(root);

        TransformerFactory tsf = TransformerFactory.newInstance();
        DOMSource source = new DOMSource(document);

        Transformer tf = tsf.newTransformer();
        tf.setOutputProperty(OutputKeys.ENCODING, "GB2312");
        tf.setOutputProperty(OutputKeys.INDENT, "  ");

        StreamResult result = new StreamResult(new File("books.xml"));

        tf.transform(source, result);
    }
}

 结果：