dom4j入门例子

package org.lee.dom4j.demo; import java.io.File; import java.io.FileWriter; import java.util.Iterator; import java.util.List; import org.dom4j.Attribute; 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; /** * 创建日期：2008-5-4 创建时间：上午11:26:21 创建作者：李赵华 */ public class Dom4jDemo { public Dom4jDemo() { } /** * * 建立一个XML文档,文档名由输入参数决定 * * @param filename * 需建立的文件名 * * @return 返回操作结果, 0表失败, 1表成功 * */ public int createXMLFile(String fileName) { /** 返回操作结果, 0表失败, 1表成功 */ int returnValue = 0; /** 建立document对象 */ Document document = DocumentHelper.createDocument(); /** 建立XML文档的根books */ Element booksElement = document.addElement("books"); /** 加入一行注释 */ booksElement.addComment("This is a test for dom4j, 李赵华, 2008.5.4"); /** 加入第一个book节点 */ Element bookElement = booksElement.addElement("book"); /** 加入show参数内容 */ bookElement.addAttribute("show", "yes"); /** 加入title节点 */ Element titleElement = bookElement.addElement("title"); /** 为title设置内容 */ titleElement.setText("九阳神功"); /** 类似的完成后两个book */ bookElement = booksElement.addElement("book"); bookElement.addAttribute("show", "yes"); titleElement = bookElement.addElement("title"); titleElement.setText("玉女心经"); bookElement = booksElement.addElement("book"); bookElement.addAttribute("show", "no"); titleElement = bookElement.addElement("title"); titleElement.setText("降龙十八掌"); /** 加入owner节点 */ Element ownerElement = booksElement.addElement("owner"); ownerElement.setText("张无忌"); try { OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("UTF-8"); /** 将document中的内容写入文件中 */ XMLWriter writer = new XMLWriter( new java.io.OutputStreamWriter(new java.io.FileOutputStream(fileName),"UTF-8")); writer.write(document); writer.close(); /** 执行成功,需返回1 */ returnValue = 1; } catch (Exception ex) { ex.printStackTrace(); } return returnValue; } /** * * 修改XML文件中内容,并另存为一个新文件 重点掌握dom4j中如何添加节点,修改节点,删除节点 * * @param filename * 修改对象文件 * @param newfilename * 修改后另存为该文件 * @return 返回操作结果, 0表失败, 1表成功 */ public int ModiXMLFile(String fileName, String newFileName) { int returnValue = 0; try { SAXReader saxReader = new SAXReader(); //saxReader.setEncoding("UTF-8"); Document document = saxReader.read(new File(fileName)); /** 修改内容之一: 如果book节点中show参数的内容为yes,则修改成no */ /** 先用xpath查找对象 */ List list = document.selectNodes("/books/book/@show"); Iterator iter = list.iterator(); while (iter.hasNext()) { Attribute attribute = (Attribute) iter.next(); if (attribute.getValue().equals("yes")) { attribute.setValue("no"); } } /** * 修改内容之二: 把owner项内容改为 西本樽月 * 并在owner节点中加入date节点,date节点的内容为2008-05-04,还为date节点添加一个参数type */ list = document.selectNodes("/books/owner"); iter = list.iterator(); if (iter.hasNext()) { Element ownerElement = (Element) iter.next(); ownerElement.setText(" "); ownerElement.addAttribute("name", "李赵华"); Element dateElement = ownerElement.addElement("date"); dateElement.setText("2008-05-04"); dateElement.addAttribute("type", "Gregorian calendar"); } /** 修改内容之三: 若title内容为九阳神功,则删除该节点 */ list = document.selectNodes("/books/book"); iter = list.iterator(); while (iter.hasNext()) { Element bookElement = (Element) iter.next(); Iterator iterator = bookElement.elementIterator("title"); while (iterator.hasNext()) { Element titleElement = (Element) iterator.next(); if (titleElement.getText().equals("九阳神功")) { bookElement.remove(titleElement); } } } try { OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("UTF-8"); /** 将document中的内容写入文件中 */ XMLWriter writer = new XMLWriter(new FileWriter(new File(newFileName)),format); writer.write(document); writer.close(); /** 执行成功,需返回1 */ returnValue = 1; } catch (Exception ex) { ex.printStackTrace(); } } catch (Exception ex) { ex.printStackTrace(); } return returnValue; } /** * 格式化XML文档,并解决中文问题 * @param filename * @return */ public int formatXMLFile(String filename){ int returnValue = 0; try{ SAXReader saxReader = new SAXReader(); Document document = saxReader.read(new File(filename)); XMLWriter output = null; /** 格式化输出,类型IE浏览一样 */ OutputFormat format = OutputFormat.createPrettyPrint(); /** 指定XML字符集编码 */ format.setEncoding("GBK"); output = new XMLWriter(new FileWriter(new File(filename)),format); output.write(document); output.close(); /** 执行成功,需返回1 */ returnValue = 1; }catch(Exception ex){ ex.printStackTrace(); } return returnValue; } public static void main(String[] args) { Dom4jDemo temp = new Dom4jDemo(); System.out.println(temp.createXMLFile("d://book1.xml")); System.out.println("成功"); System.out.println(temp.ModiXMLFile("d://book1.xml", "d://book2.xml")); System.out.println(temp.formatXMLFile("d://book1.xml")); } }