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<String> 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<String> errRet; public LayerInitTask(int num, Vector<String> 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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