今天处理 AsynchronousFileChannel 时候的一个问题,代码如下:
public static void main(String[] args) throws Exception {
String filePath = "/home/xe/git/osc/JavaNote/Lang/data/Test.java";
ExecutorService executorService = Executors.newSingleThreadExecutor();
Set<OpenOption> openOptions = new HashSet<>(Arrays.asList(new StandardOpenOption[]{StandardOpenOption.READ}));
try (AsynchronousFileChannel asynchronousFileChannel = AsynchronousFileChannel.open(Paths.get(filePath), openOptions, executorService)) {
ByteBuffer buffer = ByteBuffer.allocate(1024);
asynchronousFileChannel.read(buffer, 0, buffer, new CompletionHandler<Integer, ByteBuffer>() {
@Override
public void completed(Integer result, ByteBuffer attachment) {
System.out.println("completed,result = " + result);
executorService.shutdown();
}
@Override
public void failed(Throwable exc, ByteBuffer attachment) {
System.out.println("failed");
exc.printStackTrace();
executorService.shutdown();
}
});
} catch (Exception e) {
}
}
一直提示:
java.nio.channels.AsynchronousCloseException
一直找不到问题的原因,因为我并没有显式的去关闭 AsynchronousFileChannel,后来才发现,是被 try-with-resources 特性给关闭了,悲伤的故事。
所以,在异步调用中, 还是谨慎的处理通告的关闭操作比较好。
【Java记录】try-with-resources的一个坑
原文:http://my.oschina.net/xesam/blog/413018