生成文件时加序号

生成的文件按序号01,02,03,04去排列，有需要的同学可以使用，希望可以帮到你

        public static String generateName（File fil，final String fileName）{

                int count =  fil.listFiles(new FileFilter(){

                                public boolean accept(File file){

                                    if(file.getName().startsWith(fileName)){

                                            return true;

                                    }else{

                                        return false;

                                    }

                                }

                                   }).length;

        DecimalFormat df = new  DecimalFormat("00");

        String uniqueName = fileName + df.format(++count);

        return uniqueName;

        }

}