怎么捕获webwork下载文件时的异常
使用webwork的文件下载方式，action配置如下：
<action name="xxxxAction" type="stream"><param name="contentType">application/octet-stream;charset=GBK</param><param name="contentDisposition">attachment;filename="${downloadFileName}"</param><param name="inputName">inputStream</param><param name="bufferSize">4096</param><!--<param name="location">yyyy.action</param> --></result><result name="error" type="dispatcher"><param name="location">error.jsp</param></result></action>