decorators 应用
http://www.blogjava.net/liuwentao253/default.html?page=30
可结合sitemesh.jar decorators实现: WEB-INF下建立decorators.xml(待学)
??? 调用方式：
??? ??? 服务器端RequestThreadUtils.setRetErr(msg);RequestThreadUtils.setsetRetMsg(msg);
??? ??? 客户端jsp中<c:if test="${!empty retmsg}"><div style="background:#E1F2C0; color:#348415;">${retmsg}</div></c:if>
??? ??? ??? <c:if test="${!empty reterr}"><div style="background:#FFE3D6; color:#f00;">${reterr}</div></c:if>
