详解Java中多线程异常捕获Runnable的实现

1、背景：

Java 多线程异常不向主线程抛，自己处理，外部捕获不了异常。所以要实现主线程对子线程异常的捕获。

2、工具：

实现Runnable接口的LayerInitTask类，ThreadException类，线程安全的Vector

3、思路：

向LayerInitTask中传入Vector，记录异常情况，外部遍历，判断，抛出异常。

4、代码：

package step5.exception;

import java.util.Vector;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.TimeUnit;

import com.autonavi.pds.core.incre.impl.LayerInitTask;

public class ThreadException {

public static void main(String[] args) {

try {

Vector errRet = new Vector();

ExecutorService pool = Executors.newFixedThreadPool(6);

for (int i = 0; i < 6; ++i) {

pool.execute(new LayerInitTask(i, errRet));

}

pool.shutdown();

pool.awaitTermination(1, TimeUnit.DAYS);

if (errRet.size() > 0) {

System.out.println("根据返回值捕获：exception");

throw new RuntimeException( "入库失败！");

}

} catch (Exception e) {

System.out.println("根据抛出异常捕获：exception");

throw new RuntimeException( "入库失败！");

}

System.out.println("-----入库成功，发成功完成工作邮件--------");

}

}

package step5.exception;

import java.util.Vector;

public class LayerInitTask implements Runnable {

private int threadNum;

private Vector errRet;

public LayerInitTask(int num, Vector errRet) {

this.threadNum = num;

this.errRet = errRet;

}

@Override

public void run() {

try {

if (this.threadNum == 3) {

throw new RuntimeException( this.threadNum + ":数据格式有误.");

}

System.out.println(this.threadNum + ":刷表成功");

} catch (Exception e) {

this.errRet.add("线程:" + this.threadNum + "运行异常！");

throw new RuntimeException( this.threadNum + ":刷表失败");

}

}

}

5、结果：

Exception in thread "pool-1-thread-4" java.lang.RuntimeException: 3:刷表失败

at step5.exception.LayerInitTask.run(LayerInitTask.java:23)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

Exception in thread "main" java.lang.RuntimeException: 入库失败！

at step5.exception.ThreadException.main(ThreadException.java:27)

2:刷表成功

1:刷表成功

5:刷表成功

0:刷表成功

4:刷表成功

根据返回值捕获：exception

根据抛出异常捕获：exception

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