web.xml配置错误页面跳转（使用<error-page></error-page>）
<welcome-file-list>
<welcome-file>/index.html</welcome-file>
<welcome-file>/welcome.jsp</welcome-file>
</welcome-file-list>
<error-page>
<error-code>401</error-code>
<location>/jsp/common/error.jsp</location>
</error-page>
<error-page>
<error-code>403</error-code>
<location>/jsp/common/error.jsp</location>
</error-page>
<error-page>
<error-code>404</error-code>
<location>/jsp/common/error.jsp</location>
</error-page>
<error-page>
<error-code>500</error-code>
<location>/jsp/common/error.jsp</location>
</error-page>
<taglib>
<taglib-uri>/tags/struts-bean</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>