dom4j 操作 XML

1.导入dom4j-1.6.1.jar
2.导入jaxen-1.1.1.jar

package com.hwp.test;

import java.io.*;
import java.util.*;

import org.dom4j.*;
import org.dom4j.io.*;

/** *//**
 * @author 惠万鹏
 * 
 */
public class XmlTest
{
    /** *//**
     * <p>
     * 写XML文件
     * </p>
     * 
     * @param fileName
     *            文件名
     * @param document
     *            文档
     * @return isWritedSuccessful 写XML是否成功
     */
    public static boolean writeXML(String fileName, Document document)
    {
        boolean isWritedSuccessful = false;
        XMLWriter writer = null;
        try
        {
            OutputFormat format = OutputFormat.createPrettyPrint();
            format.setEncoding("UTF-8");
            writer = new XMLWriter(new FileOutputStream(fileName), format);
            writer.write(document);
            isWritedSuccessful = true;
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        finally
        {
            if (writer != null)
            {
                try
                {
                    writer.close();
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
        }
        return isWritedSuccessful;
    }
    
    /** *//**
     * <p>
     * 根据文件名创建XML
     * </p>
     * 
     * @param fileName
     *            文件名
     * @return 是否创建成功
     */
    public static boolean createStudentXML(String fileName)
    {
        Document document = DocumentHelper.createDocument();
        document.addComment("99级1班学生信息");
        document.addElement("students");
        return XmlTest.writeXML(fileName, document);
    }
    
    /** *//**
     * <p>
     * 根据文件名得到Document
     * </p>
     * 
     * @param fileName
     *            文件名
     * @return document
     */
    public static Document getStudentXMLDocument(String fileName)
    {
        SAXReader saxReader = new SAXReader();
        try
        {
            return saxReader.read(new File(fileName));
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        return null;
    }
    
    /** *//**
     * <p>
     * 向XML里插入一条信息
     * </p>
     * 
     * @param fileName
     * @param id
     * @param name
     * @return
     */
    public static boolean addStudentInfo(String fileName, String id, String name)
    {
        Document document = XmlTest.getStudentXMLDocument(fileName);
        if (document == null)
        {
            return false;
        }
        
        Element eStudents = document.getRootElement();
        Element eStudent = eStudents.addElement("student");
        eStudent.addAttribute("id", id);
        Element eName = eStudent.addElement("name");
        eName.setText(name);
        return XmlTest.writeXML(fileName, document);
    }
    
    /** *//**
     * <p>
     * 根据id删除相应的student信息
     * </p>
     * 
     * @param fileName
     *            文件名
     * @param id
     *            studentId
     * @return
     */
    public static boolean deleteStudentInfo(String fileName, String id)
    {
        boolean isDeleteSuccessful = false;
        Document document = XmlTest.getStudentXMLDocument(fileName);
        if (document == null)
        {
            return false;
        }
        List list = document.selectNodes("/students/student[@id='" + id + "']");
        System.out.println(list);
        if (list != null)
        {
            Iterator it = list.iterator();
            while (it.hasNext())
            {
                Element eStudent = (Element) it.next();
                if (eStudent != null)
                {
                    eStudent.getParent().remove(eStudent);
                }
                isDeleteSuccessful = document.remove(eStudent);
            }
        }
        if (isDeleteSuccessful)
        {
            return XmlTest.writeXML(fileName, document);
        }
        return isDeleteSuccessful;
    }
    
    /** *//**
     * <p>
     * 解析xml
     * </p>
     * 
     * @param fileName
     *            文件名
     * @return
     */
    public static List<ArrayList<String>> getStudentInfo(String fileName)
    {
        List<ArrayList<String>> students = null;
        students = new ArrayList<ArrayList<String>>();
        
        Document document = XmlTest.getStudentXMLDocument(fileName);
        List eStudentList = document.selectNodes("/students/*");
        if (eStudentList != null)
        {
            Iterator itEStudentList = eStudentList.iterator();
            ArrayList<String> student = null;
            while (itEStudentList.hasNext())
            {
                student = new ArrayList<String>();
                Element eStudent = (Element) itEStudentList.next();
                student.add(eStudent.attributeValue("id"));
                student.add(eStudent.element("name").getTextTrim());
                students.add(student);
            }
        }
        System.out.println(students);
        return students;
    }
    
    public static void main(String args[])
    {
        String fileName = "c:/stu.xml";
        XmlTest.createStudentXML(fileName);
         for(int i=0;i<10;i++)
             XmlTest.addStudentInfo(fileName,String.valueOf(i),"惠万鹏" + i);
         //XmlTest.deleteStudentInfo(fileName,"4");
        XmlTest.getStudentInfo(fileName);
    }
}