详解Java中多线程异常捕获Runnable的实现

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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