【Java記錄】try-with-resources的一個坑

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【Java記錄】try-with-resources的一個坑

今天處理 AsynchronousFileChannel 時候的一個問題,代碼如下:

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

一直找不到問題的原因,因為我並沒有顯式的去關閉 AsynchronousFileChannel,後來才發現,是被 try-with-resources 特性給關閉了,悲傷的故事。

所以,在非同步呼叫中, 還是謹慎的處理通告的關閉操作比較好。

【Java記錄】try-with-resources的一個坑

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