dom4j 02

网上找了个不全的例子，经过自己测试已通过，

该例子主要实现的是对实体对象存储在xml文件中crud操作，但是没有可扩充性

目前只能存储单个对象，下一篇贴上可扩展的实现

 

1、实体对象

 

public class FriendsInfo {
	String name ;
	String gtalk;
	String address;
	String image;
	String QQ;
	String MSN;
	public FriendsInfo(String name, String address) {
		
		this.address =address;
		this.name = name;
	}
	public FriendsInfo() {
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getGtalk() {
		return gtalk;
	}
	public void setGtalk(String gtalk) {
		this.gtalk = gtalk;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public String getImage() {
		return image;
	}
	public void setImage(String image) {
		this.image = image;
	}
	public String getQQ() {
		return QQ;
	}
	public void setQQ(String qQ) {
		QQ = qQ;
	}
	public String getMSN() {
		return MSN;
	}
	public void setMSN(String mSN) {
		MSN = mSN;
	}
	

}

 

 

 

 

public class WriteFriendsInfo{
    
    String filename="";
    
    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=fmessage.addElement("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");
       
        
        try{
            XMLWriter output = new XMLWriter(
                    new FileWriter(new File(filename)));
            output.write( document );
            output.close();
        } catch(IOException e){System.out.println(e.getMessage());
        }
        saveXml(document);
    }
    
    
    
    public void  delInfo(FriendsInfo fi){
         Document document=null;
       SAXReader saxReader = new SAXReader();
        try{
            FileReader fr= new FileReader(new File(filename));
            document = saxReader.read(fr); 
        }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){
        
    	delInfo(fi);
        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 = saxReader.read(fr); 
        }catch(Exception e){
            e.printStackTrace();
        }
        
        Element catalogElement = document.getRootElement();
        Element fmessage=catalogElement.addElement("message");
        
        
        Element name=fmessage.addElement("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");            
            output = new XMLWriter(new FileWriter(new File(filename)),format);
            output.write(document);
            output.close();
            
        }catch(Exception ex){
            
            ex.printStackTrace();
            
        }
    }
    public void reBuildXml(){        
           
        
        createDocument();
        addXml(createtmepinfo());
        addXml(createtmepinfo1());        
        
    }
    
    public static void main(String[] argv){
        
   
    	
    	String filename = "d:/test.xml";
        WriteFriendsInfo dom4j = new WriteFriendsInfo();
        dom4j.setFilename(filename);
        
       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("gaoming","jiangsu");
        friendsinfo.setImage("/images/text.png");
        friendsinfo.setQQ("41895555");
        friendsinfo.setMSN("ysen@gmail.com");
        return friendsinfo;
    }
     public FriendsInfo createtmepinfo(){
        FriendsInfo friendsinfo=new FriendsInfo("gao","lanyungang");
        friendsinfo.setQQ("1235551");
     
        friendsinfo.setImage("/images/text.png");
               
        return friendsinfo;
    }
    public void printFile(String filename){
        try {
            FileInputStream fis = new FileInputStream(filename);
            InputStreamReader dis = new InputStreamReader(fis);
            
            BufferedReader reader = new BufferedReader(dis);
            String s;
            while( (s = reader.readLine()) != null ) {
                System.out.println(s);
            }
            
            dis.close();
            
        }catch(IOException e) {
            System.out.println(e);
            
        }
    }
    public int formatXMLFile(String filename){
        
        int returnValue = 0;
        
        try{
            SAXReader saxReader = new SAXReader();
            Document document = saxReader.read(new File(filename));
            XMLWriter output = null;
            OutputFormat format = OutputFormat.createPrettyPrint();
            format.setEncoding("UTF-8");
            output = new XMLWriter(new FileWriter( new File(getClass().getResource("/").toString()+"/kb2.xml") ),format);
            output.write(document);
            output.close();
            returnValue = 1;
            
        }catch(Exception ex){
            ex.printStackTrace();
        }
        return returnValue;
        
    }
}

 

 

public class ReadFriendsInfo {
    
    org.dom4j.Document document=null;
    
    public ReadFriendsInfo(String filename) {
        
        SAXReader saxReader = new SAXReader();
        try{
            FileReader fr= new FileReader(new File(filename));
            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);
        }
    }
    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[]) {
    	String filename = "d:/test.xml";
        ReadFriendsInfo ri=new ReadFriendsInfo(filename);
        
        
        
    }
    
}