示例:java
import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.ThreadFactory; /** * Created by Administrator on 2017/9/6. */ //任務 class ExceptionThread2 implements Runnable { @Override public void run() { Thread t = Thread.currentThread(); System.out.println("run() by" + t); System.out.println( "eh = " + t.getUncaughtExceptionHandler() ); throw new RuntimeException(); } } //異常處理 class MyUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler { @Override public void uncaughtException(Thread t, Throwable e) { System.out.print("caught" + e); } } //以線程方式啓動任務 class HandlerThreadFactor implements ThreadFactory { public Thread newThread(Runnable r) { System.out.println(this + " creating new Thread"); Thread t = new Thread(r); System.out.println("created " + t); t.setUncaughtExceptionHandler(new MyUncaughtExceptionHandler()); System.out.println( "eh = " + t.getUncaughtExceptionHandler() ); return t; } } public class CaptureUncaughtException { public static void main(String[] args){ ExecutorService exec = Executors.newCachedThreadPool(new HandlerThreadFactor()); exec.execute(new ExceptionThread2()); } }
輸出結果:ide
因爲線程的本質特性,使得你不能捕獲從線程中逃逸的異常。一旦異常逃出任務的run()方法以外,它就會向外傳播到控制檯,除非你採起特殊的步驟捕獲這些錯誤的異常。能夠用Executor來解決這個問題。this
Thread.UncaughtException-Handler是Java SE中的新接口,它容許你在每一個Thread對象上都附着一個異常處理器,Thread.UncaughtExceptionHandler.uncaughtException()會在線程因未捕獲的異常而臨近死亡時被調用,爲了使用它,創新了一個新類型的ThreadFactory,它將在每一個新建立的Thread對象上附着一個Thread.UncaughtExceptionHandler。將這個工廠傳遞給Executors建立新的ExecutorService的方法。線程