java 使用文件库递归复制目录树

Posted 2021-05-08

public class CopyDirVisitor extends SimpleFileVisitor<Path> {
    private Path fromPath;
    private Path toPath;
    private StandardCopyOption copyOption = StandardCopyOption.REPLACE_EXISTING;
    ....
    @Override
    public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
        Path targetPath = toPath.resolve(fromPath.relativize(dir));
        if(!Files.exists(targetPath)){
            Files.createDirectory(targetPath);
        }
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
        Files.copy(file, toPath.resolve(fromPath.relativize(file)), copyOption);
        return FileVisitResult.CONTINUE;
    }
}