可以在Struts.xml中配置如下：

<global-forwards>
  <forward name="error" path="/error.jsp"></forward>
  ...
</global-forwards> 
 
 
  然后再web.xml中定义当发生404等异常时的转向如下:
<error-page>
    <error-code>401</error-code>
    <location>/error.jsp</location>
  </error-page>
  <error-page>
    <error-code>403</error-code>
    <location>/error.jsp</location>
  </error-page>
  <error-page>
    <error-code>404</error-code>
    <location>/error.jsp</location>
  </error-page>
  <error-page>
    <error-code>500</error-code>
    <location>/error.jsp</location>
  </error-page>
  <error-page>
    <exception-type>java.lang.NullPointerException</exception-type>
    <location>/error.jsp</location>
  </error-page>