1、背景：
Java 多線程異常不向主線程拋，自己處理，外部捕獲不了異常。所以要實現主線程對子線程異常的捕獲。
2、工具：
實現Runnable接口的LayerInitTask類，ThreadException類，線程安全的Vector
3、思路：
向LayerInitTask中傳入Vector，記錄異常情況，外部遍歷，判斷，拋出異常。
4、代碼：
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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("根據返回值捕獲：exception"); throw new RuntimeException( "入庫失敗！"); } } catch (Exception e) { System.out.println("根據拋出異常捕獲：exception"); throw new RuntimeException( "入庫失敗！"); } System.out.println("-----入庫成功，發成功完成工作郵件--------"); } } |
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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 + ":數據格式有誤."); } System.out.println(this.threadNum + ":刷表成功"); } catch (Exception e) { this.errRet.add("線程:" + this.threadNum + "運行異常！"); throw new RuntimeException( this.threadNum + ":刷表失敗"); } } } |
5、結果：
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Exception in thread "pool-1-thread-4" java.lang.RuntimeException: 3:刷表失敗 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: 入庫失敗！ 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 根據返回值捕獲：exception 根據拋出異常捕獲：exception |
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原文鏈接：http://blog.csdn.net/q_l_s/article/details/70159749
