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:
packagestep5.exception; importjava.util.Vector; importjava.util.concurrent.ExecutorService; importjava.util.concurrent.Executors; importjava.util.concurrent.TimeUnit; importcom.autonavi.pds.core.incre.impl.LayerInitTask; publicclassThreadException{ publicstaticvoidmain(String[]args){ try{ VectorerrRet=newVector(); ExecutorServicepool=Executors.newFixedThreadPool(6); for(inti=0;i<6;++i){ pool.execute(newLayerInitTask(i,errRet)); } pool.shutdown(); pool.awaitTermination(1,TimeUnit.DAYS); if(errRet.size()>0){ System.out.println("根据返回值捕获:exception"); thrownewRuntimeException("入库失败!"); } }catch(Exceptione){ System.out.println("根据抛出异常捕获:exception"); thrownewRuntimeException("入库失败!"); } System.out.println("-----入库成功,发成功完成工作邮件--------"); } }
packagestep5.exception; importjava.util.Vector; publicclassLayerInitTaskimplementsRunnable{ privateintthreadNum; privateVectorerrRet; publicLayerInitTask(intnum,Vector errRet){ this.threadNum=num; this.errRet=errRet; } @Override publicvoidrun(){ try{ if(this.threadNum==3){ thrownewRuntimeException(this.threadNum+":数据格式有误."); } System.out.println(this.threadNum+":刷表成功"); }catch(Exceptione){ this.errRet.add("线程:"+this.threadNum+"运行异常!"); thrownewRuntimeException(this.threadNum+":刷表失败"); } } }
5、结果:
Exceptioninthread"pool-1-thread-4"java.lang.RuntimeException:3:刷表失败 atstep5.exception.LayerInitTask.run(LayerInitTask.java:23) atjava.util.concurrent.ThreadPoolExecutor.runWorker(UnknownSource) atjava.util.concurrent.ThreadPoolExecutor$Worker.run(UnknownSource) atjava.lang.Thread.run(UnknownSource) Exceptioninthread"main"java.lang.RuntimeException:入库失败! atstep5.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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