dom4j 使用事例,及问题

package com.soft.dom4jtest;   import java.io.File;   import java.io.FileWriter;   import java.io.IOException;   import java.net.MalformedURLException;   import java.net.URL;   import java.util.Iterator;   import java.util.List;     import org.dom4j.Attribute;   import org.dom4j.Document;   import org.dom4j.DocumentException;   import org.dom4j.DocumentHelper;   import org.dom4j.Element;   import org.dom4j.io.OutputFormat;   import org.dom4j.io.SAXReader;   import org.dom4j.io.XMLWriter;       public class Foo {       public Document parse(URL url) throws DocumentException {           SAXReader reader = new SAXReader();           Document document = reader.read(url);           return document;       }       public Document read(String fileName) throws MalformedURLException,               DocumentException {           SAXReader reader = new SAXReader();           Document document = reader.read(new File(fileName));           return document;       }       public Document createDocument() {           Document document = DocumentHelper.createDocument();           Element root = document.addElement("root");           Element author1 = root.addElement("author").addAttribute("name",                   "James").addAttribute("location", "UK").addText(                   "James Strachan");           Element author2 = root.addElement("author").addAttribute("name", "Bob")                   .addAttribute("location", "US").addText("Bob McWhirter");           return document;       }       public void write(Document document) throws IOException {           // lets write to a file           XMLWriter writer = new XMLWriter(new FileWriter("output.xml"));           writer.write(document);           writer.close();           // Pretty print the document to System.out           OutputFormat format = OutputFormat.createPrettyPrint();           writer = new XMLWriter(System.out, format);           writer.write(document);           // Compact format to System.out           format = OutputFormat.createCompactFormat();           writer = new XMLWriter(System.out, format);           writer.write(document);       }         /**       * 建立一个XML 文档,文档名由输入属性决定       *        * @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, holen,2004.9.11");           /** 加入第一个book节点 */          Element bookElement = booksElement.addElement("book");           /** 加入show属性内容 */          bookElement.addAttribute("show", "yes");           /** 加入title 节点 */          Element titleElement = bookElement.addElement("title");           /** 为title设置内容 */          titleElement.setText("Dom4j Tutorials");           /** 类似的完成后两个book */          bookElement = booksElement.addElement("book");           bookElement.addAttribute("show", "yes");           titleElement = bookElement.addElement("title");           titleElement.setText("Lucene Studing");           bookElement = booksElement.addElement("book");           bookElement.addAttribute("show", "no");           titleElement = bookElement.addElement("title");           titleElement.setText("Lucene in Action");           /** 加入owner节点 */          Element ownerElement = booksElement.addElement("owner");           ownerElement.setText("O'Reilly");           try {               /** 将document中的内容写入文件中 */              XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)));               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();               Document document = saxReader.read(new File(filename));               /**               * 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 */              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 = document.selectNodes("/books/owner");               iter = list.iterator();               if (iter.hasNext()) {                   Element ownerElement = (Element) iter.next();                   ownerElement.setText("Tshinghua");                   Element dateElement = ownerElement.addElement("date");                   dateElement.setText("2004-09-11");                   dateElement.addAttribute("type", "Gregorian calendar");               }               /** 修改内容之三: 若title内容为Dom4j Tutorials,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("Dom4j Tutorials")) {                           bookElement.remove(titleElement);                       }                   }               }               try {                   /** 将document中的内容写入文件中 */                  XMLWriter writer = new XMLWriter(new FileWriter(new File(                           newfilename)));                   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 writer = null;               /** 格式化输出,类型IE浏览一样 */              OutputFormat format = OutputFormat.createPrettyPrint();               /** 指定XML编码 */              format.setEncoding("GBK");               writer = new XMLWriter(new FileWriter(new File(filename)), format);               writer.write(document);               writer.close();               /** 执行成功,需返回1 */              returnValue = 1;           } catch (Exception ex) {               ex.printStackTrace();           }           return returnValue;       }       public static void main(String[] args) {           Foo temp = new Foo();              System.out.println(temp.createXMLFile("d://holen.xml"));           System.out.println(temp.ModiXMLFile("d://holen.xml", "d://holen2.xml"));           System.out.println(temp.formatXMLFile("d://holen.xml"));               }}
 

用winmerge比对发现，错误原因是少了这么多的类，然后自己下载相关的类包编译后导入，错误解决：