jstl删除session，choose，动态获取request当前工程路径

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1.jstl标签c:remove删除sessionrequest.getSession().setAttribute("ssmsg", "修改成功");<c:remove var="ssmsg" scope="session" />

2.jstl标签choose说明

<c:choose>
<c:when test="${c.activityType==0}">
<td><a href="${c.accessUrl}${c.id}" target="_blank">预览</a></td>
</c:when>
<c:otherwise>
<td>-</td>
</c:otherwise>
</c:choose>

3.动态获取request当前工程路径

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";
// activity.setAccessUrl( SysConf.APP_SERVER_ADDR + "activity/look/" );
activity.setAccessUrl( basePath + "activity/look/" );