JSP中的EL表达式如何取值

女爷i 2023-10-16 22:04 27阅读 0赞

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源代码：

action层：

// 返回上傳圖片路勁
 		public ActionForward getImagePath(ActionMapping mapping, ActionForm form, HttpServletRequest request,
 				HttpServletResponse response) throws Exception {
 			// 获取顶部图片路径
 			HQLInfo tophqlInfo = new HQLInfo();
 			tophqlInfo.setWhereBlock("imageuploadmain.isEnable=:isEnable and imageuploadmain.imageLocation=:imageLocation");
 			tophqlInfo.setParameter("isEnable", "0");	
 			tophqlInfo.setParameter("imageLocation", "0");
 			List top_image_list = getServiceImp(request).findList(tophqlInfo);
 			request.setAttribute("top_image", top_image_list);
 			request.setAttribute("top_image_size", top_image_list.size());
 			// 获取底部图片路径
 			HQLInfo centerhqlInfo = new HQLInfo();
 			centerhqlInfo
 					.setWhereBlock("imageuploadmain.isEnable=:isEnable and imageuploadmain.imageLocation=:imageLocation");
 			centerhqlInfo.setParameter("isEnable", "0");
 			centerhqlInfo.setParameter("imageLocation", "1");
 			List center_imagelist = getServiceImp(request).findList(centerhqlInfo);
 			request.setAttribute("center_image", center_imagelist);
 			request.setAttribute("center_image_size", center_imagelist.size());
 
 			return getActionForward("iamge", mapping, form, request, response);
 		}

jsp页面：

<ul id="slides">
 			<%
 				List top_image_list = (List) request.getAttribute("top_image");
 				// System.out.println("size is:"+top_image_list.size());
 				int image_size = top_image_list.size();
 			%>
 			${top_image_size}
 			 
 
 			<li
 				style="background: url(/ekp/kms/multidoc/resource/img/banner1.jpg) no-repeat center top;"><a
 				href="javascript:void(0);" target="_blank">banner1</a></li>
 			<li
 				style="background: url(/ekp/kms/multidoc/resource/img/banner2.jpg) no-repeat center top;"><a
 				href="javascript:void(0);" target="_blank">banner2</a></li>
 			<li
 				style="background: url(/ekp/kms/multidoc/resource/img/banner3.jpg) no-repeat center top;"><a
 				href="javascript:void(0);" target="_blank">banner3</a></li>
 			<li
 				style="background: url(/ekp/kms/multidoc/resource/img/banner4.jpg) no-repeat center top;"><a
 				href="javascript:void(0);" target="_blank">banner4</a></li>
 		</ul>

页面展示:

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[Center]: https://img-blog.csdn.net/20150810161127243?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: https://img-blog.csdn.net/20150810161402978?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center