一个备份文件的程序思路

1.空目录不备份，但非空目录都备份

2.源目录 source 要递归他下面所有的文件和目录 存入List

3.循环这个list，创建每个文件的目录

4.复制

public class Test12 {

    public static void main(String[] args) throws InterruptedException {

        Timer t = new Timer();
        t.scheduleAtFixedRate(new MyTask(),new Date(),1000*30);

        for(int i = 0;i<10000;i++){
            Thread.sleep(1000);
            System.out.println("warning");
        }


    }

}

class MyTask extends TimerTask{

    static final String SOURCE = "e:\\a";
    static String DEST;

    @Override
    public void run() {

        Date d = new Date();
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
        DEST = "e:\\dest_" + df.format(d);
        File file = new File(SOURCE);
        File dest = new File(DEST);

        if(dest.exists()){
            deleteAll(dest);
        }
        System.out.println("创建备份目录？"+dest.mkdirs());
        List<File> list = new ArrayList<File>();

        getAllFile(file,list);

        backUp(list,dest);
    }

    //备份
    private static void backUp(List<File> list, File dest) {

        if (list == null || list.size() <= 0) {
            return;
        }
        for (File f : list) {
            String fpath = f.getAbsolutePath();     //取出绝对路径        e:\\a
            String newpath = fpath.replace(SOURCE, DEST);
            System.out.println("对应的新路径" + newpath);
            File newFile = new File(newpath);
            if (newFile.getParentFile().exists() == false) {
                System.out.println("创建" + newFile + "的父目录成功？" + newFile.getParentFile().mkdirs());
            }
            if (f.isFile()) {
                copy(f, newFile);
            }
        }

    }

    //复制
    private static void copy(File inFile, File outFile) {
        FileInputStream fis = null;
        FileOutputStream fos = null;
        boolean isFlag = false;

        try {
            fis = new FileInputStream(inFile);
            fos = new FileOutputStream(outFile);

            byte[] bs = new byte[1024];
            int length = -1;
            while ((length = fis.read(bs)) != -1) {
                fos.write(bs, 0, length);
            }
            fos.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    //递归获取原目录下所有的文件信息
    private static void getAllFile(File source, List<File> list) {
        if (source.isDirectory()) {
            //查看子目录 listFile()
            File[] fs = source.listFiles();
            if (fs != null && fs.length > 0) {
                //说明有子目录或子文件
                for (File ff : fs) {
                    getAllFile(ff, list);
                }
            }

        }
        list.add(source);

    }

    //递归删除
    private static void deleteAll(File f) {
        if (f.isDirectory()) {
            File[] fs = f.listFiles();
            if (fs != null && fs.length > 0) {
                for (File file : fs) {
                    deleteAll(file);
                }
            }
        }
        System.out.println(f + "删除成功？" + f.delete());
    }

}