Escribir archivo

   
File archiv = new File(path);

    if (archiv.exists()){
         try{
                FileWriter textOut;
                textOut = new FileWriter(archiv,true);
                textOut.write(msg);
                textOut.close();
            }catch(Exception w){
            }// final de catch
    }else{
      try{
           FileWriter  fw = new FileWriter (archiv);
           BufferedWriter bw = new BufferedWriter(fw);
           PrintWriter salida = new PrintWriter(bw);
           salida.println(msg);
           salida.close();
                }catch(java.io.IOException ioex){
                } // Final de catch
    }// Final de else