详解Java中多线程异常捕获Runnable的实现

时间:2022-05-22 06:24:10

详解Java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:     

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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--------");
  }
 
}
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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 + ":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:

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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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原文链接:http://blog.csdn.net/q_l_s/article/details/70159749