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千鸟

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dom4j对xml比较完整的操作  

2007-06-03 11:19:53|  分类: J2EE |  标签: |举报 |字号 订阅

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最近写的插件用到了dom4j,来读写,修改文档。用到的功能都写出来了

下面包含了两个程序 WriteFriendsInfo,和 ReadFriendsInfo

1.WriteFriendsInfo 包含了新建xml和修改,删除xml节点的方法

 一些要点:

    WriteFriendsInfo修改节点采用的方式是删除节点,然后把新的节点写进去。在不对读写要求很大的情况下,这样做比较简单。

   还有就是中文的读写问题

   写入带中文的 Document 到xml文本

            OutputFormat format = OutputFormat.createPrettyPrint();           
            format.setEncoding("UTF-8");           
            output = new XMLWriter(new FileWriter(new File("/kb2.xml")),format);

  读带中文的xml文本:

        我原来是这么写的:document = saxReader.read(new File("/kb2.xml"));
结果一遇到中文就报错,用FileReader可以免去很多字符问题:

             FileReader fr= new FileReader(new File("/kb2.xml"));
            document = saxReader.read(fr);

2.ReadFriendsInfo 的作用是读xml数据放入自定义的数据结构。

             读节点很简单充分体现了 dom4j的智能化

    
  package com.soulnew.netbeansmessage;

import org.dom4j.Document;

import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.XMLWriter;
import java.io.*;

import java.util.Iterator;
import java.util.List;
import org.dom4j.io.OutputFormat;

 

public class WriteFriendsInfo{
   
    String filename="/kb2.xml";
   
    public void setFilename(String filename) {
        this.filename = filename;
    }
   
    public String getFilename() {
        return filename;
    }
   
    public WriteFriendsInfo(){
       
    }
    public void createDocument(){
        Document document = DocumentHelper.createDocument();
       
        Element catalogElement = document.addElement("friends");
        Element fmessage=catalogElement.addElement("message");
        Element image=fmessage.addElement("image");
        Element name");
        Element gtalk=fmessage.addElement("gtalk");
        Element msn=fmessage.addElement("msn");
        Element qq=fmessage.addElement("qq");
        Element address=fmessage.addElement("address");
       
        fmessage=catalogElement.addElement("message");
        saveXml(document);
    }
    public void  delInfo(FriendsInfo fi){
        org.dom4j.Document document=null;
        org.dom4j.io.SAXReader saxReader = new org.dom4j.io.SAXReader();
        try{
         
            document = (new ReadFriendsInfo(filename)).getDocument();
        }catch(Exception e){
            e.printStackTrace();
        }
       
        List list = document.selectNodes("/friends/message/name");
       
        Iterator iter = list.iterator();
       
        while(iter.hasNext()){
            System.out.print("###########\n");
            if(iter.hasNext()){
                Element ownerElement = (Element)iter.next();
                if(ownerElement.getText().equals(fi.getName()))
                    ownerElement.getParent().getParent().remove(ownerElement.getParent());
            }
           
        }
        saveXml(document);
    }
    public void changeXml(FriendsInfo fi){
       
        org.dom4j.Document document=null;
        org.dom4j.io.SAXReader saxReader = new org.dom4j.io.SAXReader();
        try{
//            FileReader fr= new FileReader(new File(filename));
            document = (new ReadFriendsInfo(filename)).getDocument();
        }catch(Exception e){
            e.printStackTrace();
        }
       
        List list = document.selectNodes("/friends/message/name");
       
        Iterator iter = list.iterator();
       
        while(iter.hasNext()){
            System.out.print("###########\n");
            if(iter.hasNext()){
                Element ownerElement = (Element)iter.next();
                if(ownerElement.getText().equals(fi.getName()))
                    ownerElement.getParent().getParent().remove(ownerElement.getParent());
            }
           
        }
        //
        saveXml(document);
        addXml(fi);
       
    }
   
    public void addXml(FriendsInfo fi){
        delInfo(fi);
        org.dom4j.Document document=null;
        org.dom4j.io.SAXReader saxReader = new org.dom4j.io.SAXReader();
        try{
//            FileReader fr= new FileReader(new File(filename));
            document = (new ReadFriendsInfo(filename)).getDocument();
        }catch(Exception e){
            e.printStackTrace();
        }
       
        Element catalogElement = document.getRootElement();
        Element fmessage=catalogElement.addElement("message");
       
        Element Element name");
        addEleText(name,fi.getName());
        Element gtalk=fmessage.addElement("gtalk");
        addEleText(gtalk,fi.getGtalk());
        Element msn=fmessage.addElement("msn");
        addEleText(msn,fi.getMSN());
        Element qq=fmessage.addElement("qq");
        addEleText(qq,fi.getQQ());
        Element address=fmessage.addElement("address");
        addEleText(address,fi.getAddress());
        Element image=fmessage.addElement("image");
        addEleText(image,fi.getImage());
       
        saveXml(document);
       
    }
    public void addEleText(Element el,String text){
        if(text!=null)
            el.addText(text);
    }
    public void saveXml(Document document ){
       
        try{
            XMLWriter output = null;
           
            OutputFormat format = OutputFormat.createPrettyPrint();
            format.setEncoding("UTF-8");
            String xmlpath= getClass().getResource(filename).toString();
            if(xmlpath.indexOf("file:")!=-1)
                xmlpath=xmlpath.substring(6,xmlpath.length());
          
            xmlpath=changeSpace(xmlpath);
            output = new XMLWriter(new FileWriter(new File(xmlpath)),format);           
            output.write(document);
            output.close();           
        }catch(Exception ex){           
            ex.printStackTrace();
           
        }
    }
    public void reBuildXml(){
        java.lang.String filename = "/kb2.xml";
       
        createDocument();
        //  addXml(createtmepinfo());
        addXml(createtmepinfo1());
       
    }
   
    public static void main(String[] argv){
       
        java.lang.String filename = "/kb2.xml";
        com.soulnew.netbeansmessage.WriteFriendsInfo dom4j = new com.soulnew.netbeansmessage.WriteFriendsInfo();
       
        //        dom4j.createDocument();
        //        dom4j.addXml(dom4j.createtmepinfo());
        //        dom4j.addXml(dom4j.createtmepinfo1());
        //        // dom4j.formatXMLFile(filename);
        //        //dom4j.changeXml(dom4j.createtmepinfo1(),filename);
        //       // dom4j.delInfo(dom4j.createtmepinfo1(), filename);
        dom4j.reBuildXml();
        dom4j.printFile(filename);
       
       
    }
    public FriendsInfo createtmepinfo1(){
        FriendsInfo friendsinfo=new FriendsInfo("liuke","Chendu");
        friendsinfo.setImage("/images/text.png");
        friendsinfo.setQQ("41895555");
        friendsinfo.setMSN("soulnew@gmail.com");
        return friendsinfo;
    }
    public FriendsInfo createtmepinfo(){
        FriendsInfo friendsinfo=new FriendsInfo("王","ShiChuan");
        friendsinfo.setQQ("1235551");
       
        friendsinfo.setImage("/images/text.png");
       
        return friendsinfo;
    }
    public void printFile(String filename){
        try {
            String xmlpath= getClass().getResource(filename).toString();
            if(xmlpath.indexOf("file:")!=-1)
                xmlpath=xmlpath.substring(6,xmlpath.length());
         
            xmlpath=changeSpace(xmlpath);           
            FileReader fr= new FileReader(xmlpath);
           
            BufferedReader reader = new BufferedReader(fr);
            String s;
            while( (s = reader.readLine()) != null ) {
                System.out.println(s);
            }
           
        }catch(IOException e) {
            System.out.println(e);
           
        }
    }
     public String changeSpace(String string){
        StringBuffer sb=new StringBuffer(string);
        int pos=sb.indexOf("%20");
        while(pos!=-1){
            sb.replace(pos, pos+3, "\ ");
            pos=sb.indexOf("%20");
        }
        return sb.toString();
    }
 
}

///////////////////////////////////////////////////////////////


package com.soulnew.netbeansmessage;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.text.Format;
import java.util.Iterator;
import java.util.Vector;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.dom4j.Document;
import org.dom4j.DocumentException;

import org.dom4j.Element;

/**
 *
 * @author soulnew@gmail.com
 * @ blog:     http://souljava.blog.163.com
 */
public class ReadFriendsInfo {
   
    org.dom4j.Document document=null;
   
    /** Creates a new instance of mydom4j */
    public ReadFriendsInfo(){
        this("/kb2.xml");
    }
   
    public ReadFriendsInfo(String filename) {
       
        org.dom4j.io.SAXReader saxReader = new org.dom4j.io.SAXReader();
        try{
            FileReader fr= new FileReader(new File("/kb2.xml"));
            document = saxReader.read(fr);
        }catch (DocumentException ex) {
           WriteFriendsInfo wi=new WriteFriendsInfo();
           wi.reBuildXml();
         new  ReadFriendsInfo(filename);
        } catch(IOException e){
            WriteFriendsInfo wi=new WriteFriendsInfo();
            wi.reBuildXml();
           new  ReadFriendsInfo(filename);
            // e.printStackTrace();
        }
    }
    public Vector getInfo(){
        Element root = document.getRootElement();
       
        Vector v=new Vector();
        for (Iterator i = root.elementIterator("message"); i.hasNext();){
            Element foo = (Element) i.next();
            FriendsInfo fi=new FriendsInfo();
            fi.setName(foo.elementText("name"));
            if(foo.elementText("name")==null)
                continue;
            fi.setGtalk(foo.elementText("gtalk"));
            fi.setAddress(foo.elementText("address"));
            fi.setImage(foo.elementText("image"));
            fi.setQQ(foo.elementText("qq"));
            fi.setMSN(foo.elementText("msn"));
            fi.setImage(fi.getImage());
            v.add(fi);
        }
        return v;
    }
   
    public static void main(String arge[]) {
       
        ReadFriendsInfo ri=new ReadFriendsInfo("/kb2.xml");
       
    }
   
}


 

 

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