如何从Velocity模板脚本（VTL）中引发用户定义的异常？ [英] How to throw an user-defined exception from Velocity Template Script (VTL)?

问题描述

如何从Velocity Template脚本（VTL）中引发用户定义的异常？

How to throw an user-defined exception from Velocity Template Script (VTL) ?

从我的Velocity脚本中，我需要根据条件引发异常，这样，呼叫者就可以捕获异常并向最终用户显示有用的错误消息。

From my velocity script, i need to throw an exception based on a condition, so that the caller can catch the exception and present an useful error messages to the end user.

例如。

#if($passwordfield1 != $passwordfield2)
throw an exception here
#elseif($passwordfield1 == $passwordfield2)
do something
#end

在上面的示例中，如果passwordfield1和passwordfield2不匹配，则为适当的异常应该被抛出，并且需要传播给最终用户。

In the above example, if passwordfield1 and passwordfield2 is not matching,an appropriate exception should be thrown and that needs to be propagated to the end-user.

有什么方法可以从速度脚本中实现这一目标吗？如果不是，请提出另一种方法。

Is there any way to achieve this from velocity script? If not, please suggest an alternate approach.

推荐答案

context.put("exceptionThrower", new ExceptionThrower());

public class ExceptionThrower {
    public void throwUserDefined() {
        throw new UserDefinedException();
    }
}

#if ($whatever) 
$exceptionThrower.throwUserDefined()
#else
blah blah
#end

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