要捕捉自定义线程池中的异常,可以使用Thread.UncaughtExceptionHandler接口来处理未捕获的异常。

首先,创建一个实现了Thread.UncaughtExceptionHandler接口的类,用于处理未捕获的异常。例如:

public class CustomUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
    @Override
    public void uncaughtException(Thread t, Throwable e) {
        // 处理异常的逻辑
        System.out.println("线程 " + t.getName() + " 抛出了异常:" + e.getMessage());
    }
}

然后,在自定义线程池中设置该异常处理器。例如:

public class CustomThreadPoolExecutor extends ThreadPoolExecutor {
    public CustomThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue) {
        super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue);
        this.setThreadFactory(new CustomThreadFactory());
        this.setRejectedExecutionHandler(new ThreadPoolExecutor.AbortPolicy());
    }

    @Override
    protected void afterExecute(Runnable r, Throwable t) {
        super.afterExecute(r, t);
        if (t != null) {
            Thread thread = Thread.currentThread();
            Thread.UncaughtExceptionHandler handler = thread.getUncaughtExceptionHandler();
            handler.uncaughtException(thread, t);
        }
    }
}

afterExecute方法中,判断是否有异常抛出,如果有则获取当前线程的异常处理器,并调用uncaughtException方法处理异常。

最后,使用自定义线程池时,设置线程的异常处理器为自定义的异常处理器。例如:

public class Main {
    public static void main(String[] args) {
        Thread.setDefaultUncaughtExceptionHandler(new CustomUncaughtExceptionHandler());

        CustomThreadPoolExecutor executor = new CustomThreadPoolExecutor(5, 10, 1, TimeUnit.SECONDS, new LinkedBlockingQueue<>());

        executor.execute(() -> {
            throw new RuntimeException("发生异常");
        });

        executor.shutdown();
    }
}

在上面的例子中,通过Thread.setDefaultUncaughtExceptionHandler方法设置了默认的异常处理器为自定义的异常处理器。然后,创建了一个自定义线程池CustomThreadPoolExecutor,并在其中抛出了一个异常。当异常发生时,会调用自定义的异常处理器来处理异常。

java17 如何捕捉自定义的线程池中的异常

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