public   class  taskimport  extends  HttpServlet{
    
     private   int  counter;
     private  ServletContext context;
     private  String message;
     private   int  taskCounter;
     private  HashMap tasks;
    
     public   void  init(ServletConfig config) {
        tasks =  new  HashMap();
    }

     protected   void  processRequest(HttpServletRequest request, HttpServletResponse response) throws  ServletException, IOException {
         try {
            //берем параметры, проверяем их на пригодность использования
//создаемобъект для импорта данных (новый поток)
            dbimpProcess pr =  new  dbimpProcess(taskdbinfo, filenameId);
            taskCounter++;
            tasks.put(taskCounter+"", pr);
            response.setContentType("text/xml");
                response.setHeader("Cache-Control", "no-cache");
                PrintWriter pw = response.getWriter();
                pw.write("<message><impid>"+taskCounter +"</impid><status>started</status></message>");
                pw.flush()
               } catch (Exception e){ e.printStackTrace(); }
         }

      class  dbimpProcess  extends  Thread{
        
         private  String dbname;
         private   int  filenameId;
         private  String _curimpTable="";
         private   int  dbf_record_count= 0 ;
         private   int  cur_added_line= 0 ;
         private   boolean  _finished;
         private   int  ctn;
        
         public   void  run() {
           while  (true) {
                test();
                 if (_finished)   return ;
                 try {
                  sleep( 900 );
                } catch (InterruptedException e){
                  e.printStackTrace();
                }
            ctn++;
          }
        }
    
         public  dbimpProcess(String dbname,  int  filenameId){
             this .dbname = dbname;
             this .filenameId = filenameId;
            setPriority(Thread.MIN_PRIORITY);
            start();
        }
        
         public   void  test(){
            RunProgram("d:programm.bat","");  //Запускаю внешную программу, которая занимается импортом данных в БД
            _finished = true;
        }

 boolean  isfinished = ((dbimpProcess)tasks.get(taskimpId))._finished;
                     if (isfinished==true){
                        System.out.println("isfinished");
                        response.setContentType("text/xml");
                        response.setHeader("Cache-Control", "no-cache");
                        PrintWriter pw = response.getWriter();
                        pw.write("<message><impid>"+taskimpId +"</impid><status>finished</status><imptable>finished</imptable></message>");
                        pw.flush();
                    } else {
                        ARC_lastValue = ((dbimpProcess)tasks.get(taskimpId)).cur_added_line;
                        IMP_Table = ((dbimpProcess)tasks.get(taskimpId))._curimpTable;
                         if ((messageHash != null ) && (Integer.valueOf(messageHash).intValue() == ARC_lastValue)){
                            response.setStatus(HttpServletResponse.SC_NO_CONTENT);
                        } else {
                            cur_table = ((dbimpProcess)tasks.get(taskimpId))._curimpTable;
                            response.setContentType("text/xml");
                            response.setHeader("Cache-Control", "no-cache");
                            PrintWriter pw = response.getWriter();
                            //pw.write("<message>processing<curtable>" + cur_table +  "</curtable><ARC>" + ARC_lastValue +  "</ARC></message>");
                            pw.write("<message><impid>"+taskimpId+"</impid><status>" + ARC_lastValue +  "</status><imptable>"+IMP_Table+"</imptable></message>");
                            pw.flush();
                        }
                    }