关闭时可使用如下代码

public static void waitUntilTerminate(final ExecutorService executorService, final int timeout) { try { executorService.shutdown(); if (!executorService.awaitTermination(timeout, TimeUnit.SECONDS)) { //超时后直接关闭 executorService.shutdownNow(); } } catch (InterruptedException e) { //awaitTermination 出现中断异常也将触发关闭 executorService.shutdownNow(); } }

但是实际使用中，可能会出现即使使用了shutdownNow方法，还是无法终止线程的问题，那是因为你的线程无法被中断

shutdownNow方法简单理解就是给在运行的线程发一个中断信号，如果你的线程忽略这个信号，那就无法停下来

举个例子来说明这个问题

public class ShutDownUtilsTest { private ExecutorService executorService; @Before public void init() { executorService = Executors.newFixedThreadPool(1); } @Test public void shutDownOKTest() { ShutDownUtils.waitUntilTerminate(executorService, 1); CommonUtils.sleep(1); //等待线程处理中断 Assert.assertTrue(executorService.isTerminated()); } @Test public void shutDownNowFailTest() { executorService.execute(this::canNotStopThread); ShutDownUtils.waitUntilTerminate(executorService, 0); CommonUtils.sleep(1); //等待线程处理中断 Assert.assertFalse(executorService.isTerminated()); } @Test public void shutDownNowOKTest() { executorService.execute(this::stopThread); ShutDownUtils.waitUntilTerminate(executorService, 0); CommonUtils.sleep(1); //等待线程处理中断 Assert.assertTrue(executorService.isTerminated()); } private void canNotStopThread() { for (long i = 0; i < Long.MAX_VALUE; i++) { } } private void stopThread() { for (long i = 0; i < Long.MAX_VALUE && !Thread.currentThread().isInterrupted(); i++) { } }}

从上面的测试用例可以看到canNotStopThread无法被shutDownNow终止

然而stopThread可以被正常终止，因为通过Thread.currentThread().isInterrupted()在判断线程是否收到了中断信号

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。