Java|java教程
Java,捕获,异常
Java-java教程详解Java中多线程异常捕获Runnable的实现
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1、背景：
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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：
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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 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
