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 

如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！