JAVA 线程中的异常捕获

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;public class ExceptionThread implements Runnable { @Override
public void run() {
throw new RuntimeException("这个线程就干了这么一件事，抛出一个运行时异常");
} public static void main(String[] args) {
try {
ExecutorService exec = Executors.newCachedThreadPool();
exec.execute(new ExceptionThread());
System.out.println("该干嘛干嘛去");
} catch (RuntimeException e) {
System.out.println("能不能捕获到异常？");
} }}

该干嘛干嘛去
Exception in thread "pool-1-thread-1" java.lang.RuntimeException: 这个线程就干了这么一件事，抛出一个运行时异常
at ExceptionThread.run(ExceptionThread.java:8)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

import java.lang.Thread.UncaughtExceptionHandler;/**
* 用于捕获异常---捕获的是uncheckedException
*
* @author February30th
*
*/
public class MyUnchecckedExceptionhandler implements UncaughtExceptionHandler { @Override
public void uncaughtException(Thread t, Throwable e) {
System.out.println("捕获到异常：" + e);
}}

import java.util.concurrent.ThreadFactory;public class HandlerThreadFactory implements ThreadFactory { @Override
public Thread newThread(Runnable r) {
System.out.println("创建一个新的线程");
Thread t = new Thread(r);
t.setUncaughtExceptionHandler(new MyUnchecckedExceptionhandler());
System.out.println("eh121 = " + t.getUncaughtExceptionHandler());
return t;
}}

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;public class ThreadExceptionTest { /**
* @param args
*/
public static void main(String[] args) {
//下面有3中方式来执行线程。
//第1种按照普通的方式。这是能捕获到异常
Thread t = new Thread(new ExceptionThread2());
t.setUncaughtExceptionHandler(new MyUnchecckedExceptionhandler());
t.start();
//第2种按照现成池，直接按照thread方式,此时不能捕获到异常，为什么呢？因为在下面代码中创建了一个线程，且设置了异常处理器，
//但是呢，在我们线程池中会重设置新的Thread对象，而这个Thread对象没有设置任何异常处理器，换句话说，我们在线程池外对线程做的
//任何操作都是没有用的
ExecutorService exec1 = Executors.newCachedThreadPool();
Runnable runnable = new ExceptionThread2();
Thread t1 = new Thread(runnable);
t1.setUncaughtExceptionHandler(new MyUnchecckedExceptionhandler());
exec1.execute(runnable); //第3种情况一样的，也是走的线程池，但是呢是通过ThreadFactory方式，在ThreadFactory中会对线程做一些控制，可以设置异常处理器
//此时是可以捕获异常的。
ExecutorService exec = Executors.newCachedThreadPool(new HandlerThreadFactory());
exec.execute(new ExceptionThread2()); }}

创建一个新的线程
eh121 = MyUnchecckedExceptionhandler@1b8e059
run() byThread[Thread-0,5,main]
eh=MyUnchecckedExceptionhandler@1b8e059
捕获到异常：java.lang.RuntimeException: 抛出运行时异常

Thread.setDefaultUncaughtExceptionHandler(new MyUnchecckedExceptionhandler());
ExecutorService exec = Executors.newCachedThreadPool(new HandlerThreadFactory());
exec.execute(new ExceptionThread2());