java中对于多线程程序的捕获异常的方案

在并发的情况下,try{}catch{Exception ex}不能捕获一般的异常处理,这会导致在异常产生时会直接将异常输出到控制台或者是用户界面,在java5中加入了一些接口来解决这个问题,下面为简单的事例

 

package com.eric.concurrency;

import java.lang.Thread.UncaughtExceptionHandler;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 这个程序主要掩饰了在程序中队Runnable异常的捕获方法
 *
 * @author Eric
 *
 */
public class ExceptionThread {

    public static void main(String[] args) {
        try {
            CatchException.catchExceptionByUncaughtExceptionHandler();
            System.out.println("************************************");
            // CatchException.catchExceptionByCatch();
        } catch (Exception ex) {
            // ex.printStackTrace();
        }
    }
}

class ExceptionRunnable implements Runnable {
    public void run() {
        throw new RuntimeException("Throw By Runnable");
    }

}

// 用普通的catch方法捕获
class CatchException {
    public static void catchExceptionByCatch() {
        ExecutorService es = Executors.newCachedThreadPool();
        es.execute(new ExceptionRunnable());

    }

    /*
     * use try{} catch{} block can't catch exception from Runnable,to solve the
     * problem. Thread.UncaughtExceptionHandler is a new interface in Java SE5;
     * it allows you o attach an exception handler to each Thread object.
     * Thread.UncaughtExceptionHandler.uncaughtException( ) is automatically
     * called when that thread is about to die from an uncaught exception.
     */
    public static void catchExceptionByUncaughtExceptionHandler() {
        Thread t = new Thread(new ExceptionRunnable());
        t.setUncaughtExceptionHandler(new UncaughtExceptionHandler() {

            @Override
            public void uncaughtException(Thread t, Throwable e) {
                System.out.println("Exception:" + e.getMessage() + " was catched");
            }
        });
        t.start();
    }
}