本文适合java初学者。
当任务提交后，被拒绝策略有多种，例如CallerRunsPolicy，AbortPolicy，DiscardPolicy，DiscardOldestPolicy等等
本文我们看下，默认策略的使用方式。（一般是捕获异常）
默认拒绝策略JDK8.0：
/**
* The default rejected execution handler
*/
private static final RejectedExecutionHandler defaultHandler =
new AbortPolicy();
示例
public static void main(String[] args) {
ThreadPoolExecutor executor = new ThreadPoolExecutor(1, 1,
0L, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue(1));
for(int i = 0;i<10;i++){
final int finalI = i;
try {
executor.submit(new Runnable() {
@Override
public void run() {
System.out.println(String.format("处理第%s个任务", finalI));
}
});
}catch (Exception e){
System.out.println(finalI+"异常了"+ Jackson.toJson(executor));
}
}
}
结果：
处理第0个任务
处理第1个任务
2异常了{"largestPoolSize":1,"completedTaskCount":2,"threadFactory":{},"corePoolSize":1,"maximumPoolSize":1,"activeCount":0,"poolSize":1,"queue":[],"rejectedExecutionHandler":{},"taskCount":2,"shutdown":false,"terminated":false,"terminating":false}
4异常了{"largestPoolSize":1,"completedTaskCount":2,"threadFactory":{},"corePoolSize":1,"maximumPoolSize":1,"activeCount":0,"poolSize":1,"queue":[{"done":false,"cancelled":false}],"rejectedExecutionHandler":{},"taskCount":3,"shutdown":false,"terminated":false,"terminating":false}
5异常了{"largestPoolSize":1,"completedTaskCount":2,"threadFactory":{},"corePoolSize":1,"maximumPoolSize":1,"activeCount":0,"poolSize":1,"queue":[{"done":false,"cancelled":false}],"rejectedExecutionHandler":{},"taskCount":3,"shutdown":false,"terminated":false,"terminating":false}
6异常了{"largestPoolSize":1,"completedTaskCount":2,"threadFactory":{},"corePoolSize":1,"maximumPoolSize":1,"activeCount":0,"poolSize":1,"queue":[{"done":false,"cancelled":false}],"rejectedExecutionHandler":{},"taskCount":3,"shutdown":false,"terminated":false,"terminating":false}
7异常了{"largestPoolSize":1,"completedTaskCount":2,"threadFactory":{},"corePoolSize":1,"maximumPoolSize":1,"activeCount":0,"poolSize":1,"queue":[{"done":false,"cancelled":false}],"rejectedExecutionHandler":{},"taskCount":3,"shutdown":false,"terminated":false,"terminating":false}
8异常了{"largestPoolSize":1,"completedTaskCount":2,"threadFactory":{},"corePoolSize":1,"maximumPoolSize":1,"activeCount":0,"poolSize":1,"queue":[{"done":false,"cancelled":false}],"rejectedExecutionHandler":{},"taskCount":3,"shutdown":false,"terminated":false,"terminating":false}
9异常了{"largestPoolSize":1,"completedTaskCount":2,"threadFactory":{},"corePoolSize":1,"maximumPoolSize":1,"activeCount":0,"poolSize":1,"queue":[{"done":false,"cancelled":false}],"rejectedExecutionHandler":{},"taskCount":3,"shutdown":false,"terminated":false,"terminating":false}
处理第3个任务