Dom4j 解析xml(dom4j-1.6.1.jar)

/**
放两个jar就ok了，容易的很
导入两个jar
1、dom4j-1.6.1.jar 2、jaxen-1.1-beta-6.jar
该类中包括了四个方法
1、  createXMLFile
2、  ReadXMLFile
3、  ModiXMLFile
4、  formatXMLFile
*/
package test;
import java.io.File;
import java.io.FileWriter;
import java.net.URL;
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.Node;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.xml.sax.InputSource;
public class Dom4jDemo {
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;
}
public int ReadXMLFile(String filename) {
  String text = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?><a><b>b</b></a>";
  int returnValue = 0;
  try {
   SAXReader saxReader = new SAXReader();
   //用来读取xml文件
   //Document document = saxReader.read(filename);//读取xml文件
   Document document = DocumentHelper.parseText(text);//把String转换为Docment
   //String xml = document.asXML();//把Docment转换为String
   List list = document.selectNodes("/a");
   Iterator iter = list.iterator();
   iter = list.iterator();
   while (iter.hasNext()) {
    Element bookElement = (Element) iter.next();
    Iterator iterator   = bookElement.elementIterator("b");
    while (iterator.hasNext()) {
     Element titleElement = (Element) iterator.next();
     System.out.println(titleElement.getText());
    }
   }
  } catch (Exception ex) {
   ex.printStackTrace();
  }
  return returnValue;
}
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) {
  Dom4jDemo dom4jDemo = new Dom4jDemo();
  dom4jDemo.createXMLFile("D:/holen1.xml");
  System.out.println("create ok");
 
  dom4jDemo.formatXMLFile("D:/holen1.xml");
  System.out.println("format ok");
 
  dom4jDemo.ModiXMLFile("D:/holen1.xml","D:/holen2.xml");
  System.out.println("modiy ok");
 
  dom4jDemo.ReadXMLFile("D:/holen.xml");
  System.out.println("read ok");
}
}