java 主线程捕获子线程异常_Java子线程中的异常处理
正常情况下异常需要自己的线程中取catch的,在主线程是抓不住的,而子线程异常没抓住的话,就是打印在控制台不方便排查,下面介绍一些处理
1.自定义实现Thread.UncaughtExceptionHandler,并制定线程工程时生产的线程都有这个策略
static class ThreadFactoryMy implements ThreadFactory{
@Override
public Thread newThread(Runnable r) {
Thread thread = new Thread(r);
thread.setUncaughtExceptionHandler(newUncaughtExceptionHandlerMy());
return thread;
}
}
static class UncaughtExceptionHandlerMy implements Thread.UncaughtExceptionHandler{
@SneakyThrows
@Override
public void uncaughtException(Threadt, Throwable e) {
log.error(e.getMessage());
}
}
2.创建线程
//1.手动创建
Thread student = new Thread();
student.setUncaughtExceptionHandler(new UncaughtExceptionHandlerMy());
student.start();
//2.ExecutorService创建
ExecutorService executorService =Executors.newFixedThreadPool(3, new ThreadFactoryMy());
//3 ThreadPoolTaskExecutor创建
ThreadPoolTaskExecutor threadPoolTaskExecutor = newThreadPoolTaskExecutor();
threadPoolTaskExecutor.setThreadFactory(new ThreadFactoryMy());
3.但是上述只会在子线程中抓住并打印,若需要主线得到子线程的异常,并开展业务,则
实现callabel,用future返回线程执行结果
static class Teacher implements Callable {
@Override
public Object call() throws Exception {
int i = 1 / 0;
System.out.println("执行");
return null;
}
}
主线程
try {
Future submit = executorService.submit(new Teacher());
Object o = submit.get();
} catch (Exception e) {
System.out.println("抓住子线程异常");
throw new RuntimeException("自定义异常");
}
