在使用AsynchronousFileChannel进行文件操作时,无法直接创建子目录。此时需要手动创建子目录,并在子目录中创建文件。
以下是一个使用Java NIO.2中的Path和Files类创建子目录和文件的示例代码:
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.nio.ByteBuffer;
import java.nio.channels.*;
public class AsyncFileIOExample {
public static void main(String[] args) {
String filePath = "path/to/subdirectory/newfile.txt";
Path path = Paths.get(filePath);
try {
// 创建目录
Files.createDirectories(path.getParent());
// 在目录中创建文件
AsynchronousFileChannel asyncChannel = AsynchronousFileChannel.open(path, StandardOpenOption.CREATE, StandardOpenOption.WRITE);
ByteBuffer buffer = ByteBuffer.allocate(1024);
long position = 0;
buffer.put("Hello, World!".getBytes());
buffer.flip();
CompletableFuture future = new CompletableFuture<>();
asyncChannel.write(buffer, position, null, new CompletionHandler() {
@Override
public void completed(Integer result, Object attachment) {
future.complete(result);
}
@Override
public void failed(Throwable exc, Object attachment) {
future.completeExceptionally(exc);
}
});
// 等待异步操作完成
Integer bytesWritten = future.get();
System.out.println("Bytes written: " + bytesWritten);
// 关闭文件通道
asyncChannel.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}