设置用户输入超时

Question

我正在尝试使用以下代码在 java 控制台应用程序中设置用户输入超时

ExecutorService executor = Executors.newSingleThreadExecutor();
Callable task =() ->  {
    System.out.print("input: ");
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    return br.readLine();
};
Future future = executor.submit(task);
String input = null;
try {
     input = (String)future.get(10, TimeUnit.SECONDS);

} catch (TimeoutException e) {
    future.cancel(true);
    System.out.println("Sorry you run out of time!"));
} catch (InterruptedException | ExecutionException e) {
     e.getMessage();
} finally {
   executor.shutdownNow();
}

10 秒后，当用户未输入任何内容时，将显示超时消息。但是每当用户尝试输入某些内容时，程序就会卡住并且不会 return 输入

Answer 1

更正小的编译问题并输出 input 的值代码在成功输入时运行良好：

public class Foo {

    public static void main(String[] argv) {
        ExecutorService executor = Executors.newSingleThreadExecutor();
        Callable task =() ->  {
            System.out.print("input: ");
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            return br.readLine();
        };
        Future future = executor.submit(task);
        try {
            String input = (String)future.get(10, TimeUnit.SECONDS);
            System.out.println(input);
        } catch (TimeoutException e) {
            future.cancel(true);
            System.out.println("Sorry you run out of time!");
        } catch (InterruptedException | ExecutionException e) {
            e.getMessage();
        } finally {
            executor.shutdownNow();
        }

    }
}

版画

input: wfqwefwfqer

wfqwefwfqer

Process finished with exit code 0

但是，您的代码 存在超时错误 ：shutdownNow 并未真正终止输入线程，应用程序一直运行等待输入并且只有在收到一些输入并正常终止线程后才退出。但这不在你的提问范围内。

设置用户输入超时

Set timeout on user input

java

executorservice