使用dom4j修改xml元素
预先编写一个xml文件books.xml，内容如下：
<?xml version="1.0" encoding="UTF-8"?><books><!--This is a test for dom4j, jakoes, 2007.7.19--><book show="yes" url="lucene.net"><title id="456">Lucene 学习</title></book><book show="yes" url="dom4j.com"><title id="123">Dom4j Tutorials</title></book><book show="no" url="spring.org"><title id="789">Spring in Action</title></book><owner>O'Reilly</owner></books>
?修改books.xml文件的java代码XmlModify.java：
/** * XmlModify.java * 2011-2-21 下午03:07:14 */package com.gbit.test;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Iterator;import java.util.List;import org.dom4j.Attribute;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;/** * @author linzq * */public class XmlModify{ /** * @param args * @throws DocumentException * @throws IOException */ public static void main(String[] args) throws DocumentException, IOException { String path = XmlModify.class.getResource(".").getFile().toString(); SAXReader reader = new SAXReader(); // 设置读取文件内容的编码 reader.setEncoding("GBK"); Document doc = reader.read(path + "books.xml"); // System.out.println(doc); // 修改内容之一: 如果book节点中show属性的内容为yes,则修改成no // 先用xpath查找对象 // 根据试用，根节点books的xpath路径要加/或不加都可以。 List<Attribute> attrList = doc.selectNodes("books/book/@show"); Iterator<Attribute> i = attrList.iterator(); while (i.hasNext()) { Attribute attribute = i.next(); if (attribute.getValue().equalsIgnoreCase("yes")) { attribute.setValue("no"); } } // 修改内容之二: 把owner项内容改为Tshinghua // 并在owner节点中加入date节点,date节点的内容为2004-09-11,还为date节点添加一个属性type List<Element> eleList = doc.selectNodes("owner"); Iterator<Element> eleIter = eleList.iterator(); if (eleIter.hasNext()) { Element ownerElement = eleIter.next(); ownerElement.setText("Tshinghua"); Element dateElement = ownerElement.addElement("date"); DateFormat df = SimpleDateFormat.getDateInstance(); dateElement.setText(df.format(new Date())); ownerElement.addAttribute("type", "Gregorian calendar"); } // 修改内容之三: 若title内容为Dom4j Tutorials,则删除该节点 eleList = doc.selectNodes("books/book"); eleIter = eleList.iterator(); while (eleIter.hasNext()) { Element element = eleIter.next(); Iterator<Element> titleIter = element.elementIterator("title"); while (titleIter.hasNext()) { Element title = titleIter.next(); if (title.getText().equalsIgnoreCase("Dom4j Tutorials")) { element.remove(title); } } } OutputFormat format = OutputFormat.createPrettyPrint(); // 利用格式化类对编码进行设置 format.setEncoding("GBK"); FileOutputStream output = new FileOutputStream(new File(path + "books1.xml")); XMLWriter writer = new XMLWriter(output, format); writer.write(doc); writer.flush(); writer.close(); }}?
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