File工具类

1.遍历文件夹

   public static List<File> getFileList(String strPath,List<File> filelist) {
        File dir = new File(strPath);
        File[] files = dir.listFiles(); // 该文件目录下文件全部放入数组
        if (files != null) {
            for (int i = 0; i < files.length; i++) {
                String fileName = files[i].getName();
                if (files[i].isDirectory()) { // 判断是文件还是文件夹
                    getFileList(files[i].getAbsolutePath(),filelist); // 获取文件绝对路径
                } else if (fileName.endsWith("avi")) { // 判断文件名是否以.avi结尾
                    String strFileName = files[i].getAbsolutePath();
                    System.out.println("---" + strFileName);
                    filelist.add(files[i]);
                } else {
                    continue;
                }
            }

        }
        return filelist;
    }

2.读取txt文本文件

    public static void readTxtFile(String filePath){
        File file = new File(filePath);
        try{
            if(file.exists() && file.isFile() && file.getName().endsWith(".txt")){
                InputStreamReader read = new InputStreamReader(
                        new FileInputStream(file), "utf-8");//考虑到编码格式
                BufferedReader bufferedReader = new BufferedReader(read);
                String lineTxt = null;
                while ((lineTxt = bufferedReader.readLine()) != null) {
                    System.out.println(lineTxt);
                    Scanner sca = new Scanner(lineTxt.trim());
                    String str = sca.next();
                    int num = sca.nextInt();
                    while(sca.hasNextInt()){

                    }
                }
            }
        }catch (Exception e){
            System.out.println("读取文件错误！");
        }

    }