Thread.UnCaughtExceptionHandler接口，为每一个Thread对象创建一个异常处理器

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本文介绍如何在Java中利用Thread.UncaughtExceptionHandler捕获并处理线程中的未捕获异常。通过实现自定义的异常处理器，并结合使用ThreadFactory，确保每个新建线程都能注册异常处理器。示例代码展示了如何创建此类处理器并在ExecutorService中使用。

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

/*
* 通过修改Executor生产线程的方法，Java SE5中一个新接口为Thread.UnCaughtExceptionHandler
* 这个接口允许你在每个Thread对象上都附着一个异常处理器
* 为了使用它，我们将创建一个ThreadFactory，
* 这样为每一个创建的Thread对象附着一个throw new RuntimeException();
* **/
class ExceptionThread2 implements Runnable{

@Override
public void run() { 
    Thread t = Thread.currentThread();
    System.out.println("run() by "+t);
    System.out.println("en = "+t.getUncaughtExceptionHandler());
    throw new RuntimeException();
}

}

class MyUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler{

@Override
public void uncaughtException(Thread t, Throwable e) {
    System.out.println("caught "+e);
}

}

class HandlerThreadFactory implements ThreadFactory{

@Override
public Thread newThread(Runnable r) {
    // TODO Auto-generated method stub
    System.out.println(this + "creating new thread");
    Thread t = new Thread(r);
    System.out.println("created "+t);
    t.setUncaughtExceptionHandler(new MyUncaughtExceptionHandler());
    System.out.println("en = "+t.getUncaughtExceptionHandler());
    return t;
}

}

public class CaptureUncaughtException {

public static void main(String[] args){
    ExecutorService exec = Executors.newCachedThreadPool(new HandlerThreadFactory());
    exec.execute(new ExceptionThread2());
}

}