public class xml2tree {
    
    public static String generateSpacers(int n){
        StringBuilder sb=new StringBuilder();
        for(int i=0;i<n;i++) sb.append(" ");
        return sb.toString();
    }
    
    public static void main(String[] args) throws Exception {        
        
        String src="src.xml";
        String dest="dest.txt";
        
        XMLInputFactory factory = XMLInputFactory.newInstance();
        
        XMLStreamReader streamReader = factory.createXMLStreamReader(new FileReader(src));        
        
        Stack st=new Stack();
        
        int indent=0;
        
        PrintWriter destWr=new PrintWriter(new BufferedWriter(new FileWriter(new File(dest))));
        
        while(streamReader.hasNext()){

            boolean startEnd=false;
            
            streamReader.next();

            if(streamReader.getEventType() == XMLStreamReader.START_ELEMENT){ 
                String element_name=streamReader.getPrefix()+":"+streamReader.getLocalName();
                st.push((Object)element_name);
                indent+=4;
                String s=generateSpacers(indent);
                destWr.print(s);
                destWr.printf("+- %s\n",element_name);
                destWr.println();
                startEnd=true;
            } 
            else if(streamReader.getEventType() == XMLStreamReader.END_ELEMENT){                
                indent-=4;                               
                startEnd=true;
                st.pop();
            }
            
            if (startEnd) continue;
            
            if(streamReader.getEventType() == XMLStreamReader.ATTRIBUTE){
                continue;
            }            
            
            if(streamReader.getEventType() == XMLStreamReader.CHARACTERS){
                continue;
            }            
            System.out.println("Unknown event : "+streamReader.getEventType());            

        }        
        destWr.close();
        
    
    }
}

8a9,28
>     public static void printStack(Stack st,PrintWriter pw,boolean closed){        
>         Iterator it=st.iterator();
>         while(it.hasNext()){
>             Object o=it.next();
>             String name=(String)o;            
>             if (o==st.lastElement()){
>                 if (!closed){
>                     pw.print(" +- ");
>                     pw.print(name);
>                 }
>             }
>             else{
>                 pw.print(" |  ");
>                 //pw.print(generateSpacers(name.length()));
>                 pw.print("      ");
>             }
>         }        
>         pw.println();
>     }
>     
34,37c54,55
<                 String s=generateSpacers(indent);
<                 destWr.print(s);
<                 destWr.printf("+- %s\n",element_name);
<                 destWr.println();
---
>                 String s=generateSpacers(indent);                                
>                 printStack(st,destWr,false);
41a60
>                 printStack(st,destWr,true);