java - 如何停止 java 执行程序类中的所有可运行线程？

Question

final ExecutorService executor = Executors.newFixedThreadPool(1);
final Future<?> future = executor.submit(myRunnable);
executor.shutdown();
if(executor.awaitTermination(10, TimeUnit.SECONDS)) {
  System.out.println("task completed");
}else{
  System.out.println("Executor is shutdown now");
}

//MyRunnable method is defined as task which I want to execute in a different thread.

这是执行器类的run方法:

public void run() {
try {
     Thread.sleep(20 * 1000);
} catch (InterruptedException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
}}

这里它正在等待 20 秒但是当我运行代码时它抛出异常:

java.lang.InterruptedException: sleep interrupted
at java.lang.Thread.sleep(Native Method)

我无法关闭 Java Executor 类 中破坏的并发线程。这是我的代码流程:

• 使用 Java 执行器类创建了一个新线程来运行一些任务，即在 MyRunnable 中编写
• executor 等待 10 秒完成任务。
• 如果任务已完成，则可运行线程也将终止。
• 如果任务未在 10 秒内完成，则 executor 类应终止线程。

除最后一个场景中的任务终止外，一切正常。我应该怎么做？

Answer 1

shutDown()方法只是阻止安排其他任务。相反，您可以调用 shutDownNow()并检查 Runnable 中的线程中断。

// in your Runnable...
if (Thread.interrupted()) {
  // Executor has probably asked us to stop
}

根据您的代码，示例可能是:

final ExecutorService executor = Executors.newFixedThreadPool(1);
executor.submit(new Runnable() {
  public void run() {
    try {
      Thread.sleep(20 * 1000);
    } catch (InterruptedException e) {
      System.out.println("Interrupted, so exiting.");
    }
  }
});

if (executor.awaitTermination(10, TimeUnit.SECONDS)) {
  System.out.println("task completed");
} else {
  System.out.println("Forcing shutdown...");
  executor.shutdownNow();
}