3 ways to delete files/folders in java

1. Delete files through io

    /**
     * 通过递归逐层删除文件信息
     *
     * @param filePath
     */
    public static void deleteFileByIO(String filePath) {
    
    
        File file = new File(filePath);
        File[] list = file.listFiles();
        if (list != null) {
    
    
            for (File temp : list) {
    
    
                deleteFileByIO(temp.getAbsolutePath());
            }
        }
        file.delete();
    }

2. Delete files through Files.walk

    /**
     * 使用Files.walk遍历文件夹（包含子文件夹及子其文件），遍历结果是一个Stream
     * 对每一个遍历出来的结果进行处理，调用Files.delete就可以了。
     *
     * @param filePath
     * @throws IOException
     */
    public static void deleteFileByStream(String filePath) throws IOException {
    
    
        Path path = Paths.get(filePath);
        try (Stream<Path> walk = Files.walk(path)) {
    
    
            walk.sorted(Comparator.reverseOrder())
                    .forEach(FileUtil::deleteDirectoryStream);
            // FileUtil为类名
        }
    }

    private static void deleteDirectoryStream(Path path) {
    
    
        try {
    
    
            Files.delete(path);
        } catch (IOException e) {
    
    
            e.printStackTrace();
        }
    }

3. Delete files through Files.walkFileTree

 /**
     * 使用walkFileTree方法遍历整个文件目录树，使用FileVisitor处理遍历出来的每一项文件或文件夹
     * FileVisitor的visitFile方法用来处理遍历结果中的“文件”，所以我们可以在这个方法里面删除文件
     * @param filePath
     * @throws IOException
     */
    public static void deleteFileByWalkFileTree(String filePath) throws IOException {
    
    
        Path path = Paths.get(filePath);
        Files.walkFileTree(path,
                new SimpleFileVisitor<Path>() {
    
    
                    // 先去遍历删除文件
                    @Override
                    public FileVisitResult visitFile(Path file,
                                                     BasicFileAttributes attrs) throws IOException {
    
    
                        Files.delete(file);
                        System.out.printf("文件被删除 : %s%n", file);
                        return FileVisitResult.CONTINUE;
                    }

                    // 再去遍历删除目录
                    @Override
                    public FileVisitResult postVisitDirectory(Path dir,
                                                              IOException exc) throws IOException {
    
    
                        Files.delete(dir);
                        System.out.printf("文件夹被删除: %s%n", dir);
                        return FileVisitResult.CONTINUE;
                    }

                }
        );
    }