Java文件目录相关操作

遍历目录

• 代码示例

    Path path = Paths.get("D:\\copycentos");
        AtomicInteger dirCount = new AtomicInteger();
        AtomicInteger fileCount = new AtomicInteger();
        Files.walkFileTree(path,new SimpleFileVisitor<Path>(){
            // 访问文件目录前....todo
            @Override
            public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
                    System.out.println(dir);
                    dirCount.incrementAndGet();
                    return super.preVisitDirectory(dir, attrs);
            }
            // 访问文件.....todo
            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                System.out.println(file);
                fileCount.incrementAndGet();
                return super.visitFile(file, attrs);
            }
 			// 访问文件失败....todo
            @Override
            public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
                return super.visitFileFailed(file, exc);
            }
			// 访问目录后....todo
            @Override
            public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
                return super.postVisitDirectory(dir, exc);
            }
        });
        System.out.println(dirCount);
        System.out.println(fileCount); 
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删除多级目录

• 示例代码
  • 会删除本机目录和内层目录

   Path path = Paths.get("D:\\ceshi2");
        Files.walkFileTree(path, new SimpleFileVisitor<Path>() {
            @Override
            public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
                return super.preVisitDirectory(dir, attrs);
            }

            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                Files.delete(file);
                return super.visitFile(file, attrs);
            }

            @Override
            public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
                return super.visitFileFailed(file, exc);
            }

            @Override
            public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
                Files.delete(dir);
                return super.postVisitDirectory(dir, exc);
            }
        });
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拷贝多级目录

• 示例代码

   String source = "D:\\ceshi";
        String target = "D:\\ceshi22";
        Files.walk(Paths.get(source))
                .forEach(path -> {
                    try {
                        String targetName = path.toString().replace(source, target);
                        if (Files.isDirectory(path)) {
                            Files.createDirectories(Paths.get(targetName));
                        } else if (Files.isRegularFile(path)) {
                            Files.copy(path, Paths.get(targetName));
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                });
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