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Java多线程将D盘塞满

        笔记本电脑出现问题,想着拿到售后服务中心检修,担心删除的文件被恢复窥探,遂编写程序试图将D盘塞满覆盖之前的使用痕迹。感觉挺无聊的。

private static Random random = new Random();
private static List<Character> chars = new ArrayList<>();
// 线程池
private static ExecutorService executorService = Executors.newFixedThreadPool(6);static {for (char c = 'A'; c <= 'Z'; c++) {chars.add(c);chars.add((char) (c + 32));}
}public static void main(String[] args) {File sourceRoot = new File("E:/娱乐电影/铁齿铜牙纪晓岚第一部");File[] files = sourceRoot.listFiles();while (random.nextInt(600) != 168) {// lambda表达式executorService.execute(() -> {File originFile = getFile(files);file file = generateFile();try(InputStream in = new FileInputStream(originFile);OutputStream out = new FileOutputStream(file)) {byte[] buffer = new byte[in.available()];in.read(buffer);out.write(buffer);} catch (IOException e) {e.printStackTrace();}});}executorService.shutdown();
}private static File generateFile() {StringBuffer sb = new StringBuffer("D:/");// 目录层级int level = randomInt(6);// 名称长度int length = randomInt(20);// 拼接多级目录名,比如 D:/aZw/UoPye/for (int i = 0; i < level; i++) {for (int j = 0; j < length; j++) {sb.append(getChar());}sb.append("/");}// 创建多级目录File root = new File(sb.toString());root.mkdirs();// 文件名for (int j = 0; j < length; j++) {sb.append(getChar());}// 创建文件File file = new File(sb.toString));try {file.createNewFile();} catch (IOException e) {e.printStackTrace();}return file;
}// 随机获取一个字符
private static char getChar() {return chars.get(random.nextInt(chars.size()));
}// 保证目录至少有两级,或者名称至少有两个字符
private static int randomInt(int bound) {int i;do {i = random.nextInt(bound);} while (i < 2);return i;
}// 随机获取一个文件
private static File getFile(File[] files) {return files[random.nextInt(files.length)];
}

  第一次接触lambda表达式,是在3年前阅读刚接触的项目的源码。当时看不懂,于是找度娘,才知道是Java8新特性lambda表达式,照着例子敲了demo。前段时间,在“多线程”专题中,讲师大幅度使用lambda表达式,感觉十分优雅。   

本文标签: Java多线程将D盘塞满