<welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <error-page> <exception-type> cn.hxex.message.exception.MessageDAOException </exception-type> <location>/error/daoerror.jsp</location></error-page>
遇到MessageDAOException时会自动跳转到daoerror.jsp处理页面
