public void jButton6_actionPerformed(ActionEvent e) {
    String Filelocation = "c:\\temp\\hello.txt";
 
    try{
      InputStream is = new FileInputStream(Filelocation);
 
      //get the size of the file
      long length = Filelocation.length();
 
      //range check to make sure length is not larger than int max val
      if(length > Integer.MAX_VALUE){
        XML(ErrorLog,"ERROR",2,0,"File trying to be sent is too large");
      }
 
      //create byte array
      byte[] DataStore = new byte[(int)length];
 
      //read
      int offset =0;
      int numread =0;
      while(offset < DataStore.length && (numread = is.read(DataStore,offset,DataStore.length-offset))>=0){
        offset += numread;
      }
 
      //close the input stream
      is.close();
 
      //call the set method of store the data
      try{
        ds.setdata(DataStore);
      }catch(Exception ex){
        XML(ErrorLog,"ERROR",2,0,"Error storing data : "+ex.toString());
        System.err.println("Error storing data");
      }
    }catch(Exception x){
      XML(ErrorLog,"ERROR",2,0,"Error serialising : "+x.toString());
      System.err.println("Error serialising");
    }
  }

  public void jButton7_actionPerformed(ActionEvent e) {
    byte[] Data = ds.getdata();
 
    try{      
      FileOutputStream os = new FileOutputStream("c:\\temp\\HOE.txt");
 
      os.write(Data);
      os.close();
 
    }catch(Exception ex){
      XML(ErrorLog,"ERROR",2,0,"Error saving download file : "+ex.toString());
    }
 
  }

String Filelocation = "c:\\temp\\hello.txt";
//get the size of the file
long length = Filelocation.length();

long length = is.available();