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：

??????

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--------");}}
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;}@Overridepublic 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：

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

總結

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