dom4j操作xml的增删改查

package cn.redwave.dom4j; import java.io.File; import java.io.FileOutputStream; import java.util.List; import org.dom4j.Document; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.io.OutputFormat; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter; import org.junit.Test; /* * @author redwave * description:dom4j操作xml文档 * 2013-11-17 */ public class testForDom4j { @Test public void read() throws Exception{ SAXReader reader = new SAXReader(); Document document = reader.read(new File("src/book.xml")); Element root = document.getRootElement(); Element book = (Element)root.elements("书").get(1); String value = book.element("书名").getText(); //String nameValue = book.element("书名").attribute("name").getValue(); String nameValue = book.element("书名").attributeValue("name"); System.out.println("书名dename是："+nameValue); } //解决乱码问题 || sun io流的问题 @Test public void write() throws Exception{ SAXReader reader = new SAXReader(); Document document = reader.read(new File("src/book.xml")); Element book = document.getRootElement().element("书"); book.addElement("售价").setText("209元"); //格式化输出器 OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("gb2312"); //将内存中的document写到xml文档 //下面的FileWriter不能指定字符集，出现乱码 //XMLWriter writer = new XMLWriter(new FileWriter("src/book.xml")); //*********第一种方式************* // XMLWriter writer = new XMLWriter(new OutputStreamWriter(new FileOutputStream("src/book.xml"),"gb2312"),format); // writer.write(document); // writer.close(); XMLWriter writer = new XMLWriter(new FileOutputStream("src/book.xml"),format); writer.write(document); writer.close(); } //在第一本书上添加 ||指定位置上添加 @Test public void add() throws Exception{ SAXReader reader = new SAXReader(); Document document = reader.read(new File("src/book.xml")); Element book = document.getRootElement().element("书"); List list = book.elements(); //保存所有孩子的集合 【书名、作者、售价】 Element price = DocumentHelper.createElement("售价"); price.setText("200元"); //在第三个位置添加 list.add(2, price); //格式化输出器 OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("gb2312"); XMLWriter writer = new XMLWriter(new FileOutputStream("src/book.xml"),format); writer.write(document); writer.close(); } @Test public void delete() throws Exception{ SAXReader reader = new SAXReader(); Document document = reader.read(new File("src/book.xml")); Element price = document.getRootElement().element("书").element("售价"); price.getParent().remove(price); //格式化输出器 OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("gb2312"); XMLWriter writer = new XMLWriter(new FileOutputStream("src/book.xml"),format); writer.write(document); writer.close(); } @Test public void update()throws Exception{ SAXReader reader = new SAXReader(); Document document = reader.read(new File("src/book.xml")); //得到第二本书 Element book = (Element)document.getRootElement().elements("书").get(1); book.element("作者").setText("天天"); //格式化输出器 OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("gb2312"); XMLWriter writer = new XMLWriter(new FileOutputStream("src/book.xml"),format); writer.write(document); writer.close(); } }