java - 从java中的异常处理e中检索值

Question

我有兴趣检查异常值，如果我将状态设置为特定值，那么我想将货币字符串返回/设置为相应的错误，用户可以在客户端抛出错误。

/*code snippet */

       cr.setName(Name);
       cr.setContact(User);
       cr.setValue(Value);
       cr.setStatus(status);

       try
            {
                currency = (serviceCountry.createCurrencyTicket( cr, null ));

                if ( testPattern( currency ) )
                {
                    return currency;
                }

            }
            catch ( Exception e )
            {
                this.logger.log( Level.WARNING,
                                "Exception occured while evaluating currency = "
                                                + currency, params );                
            }

例如Exception e有response、cause、stackTrace对象。我想从响应中检索值并将货币设置为特定错误。有点像

catch ( Exception e )
{
  if ( e.getClass().getName().getStatus() == 2 )
   {
    currency = 'ERROR';
   } else if ( e.getClass().getName().getStatus() == 0 )
   {
    currency = 'DOWN';
   }
}

Answer 1

捕获抛出的实际异常类型是一种选择

try
{
     currency = (serviceCountry.createCurrencyTicket( cr, null ));
}catch(MyCustomException ex)
{
     if( ex.getStatus() == 2 )
         currency = "Oh Nos";
     else if( ex.getStatus() == 0 )
         currency = "Ehh";
}catch(Exception e)
{
     currency = "SuperBad";
}

另一个虽然乏味的选择是检查抛出的异常的类型

try
{
     currency = (serviceCountry.createCurrencyTicket( cr, null ));
}catch(Exception e)
{
     if( e instanceof MyCustomException )
     {
         MyCustomException customEx = (MyCustomException)e;
         if( customEx.getStatus() == 2 )
             currency = "Oh Nos";
         else if( customEx.getStatus() == 0 )
             currency = "Ehh";
     }
     else
         currency = "SuperBad";
}