Jsp遍历后台传过来的List
1:使用jstl标签 (可以和自定义标签配合使用)
首先引用jstl标签
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
然后使用foreach标签
<c:forEach items="${list}" var="user" varStatus="vs"> <tr> <td> <s:property value="#vs.index+1"/> </td> <td align = "center">${user.PId}</td> <td align = "center">${user.PLoginname}</td> <td align = "center">${user.PUserName}</td> <td align = "center">${user.PEmail}</td> <td align = "center"><html:department pdeptid="${user.PDeptid}"></html:department></td> <!-- 自定义标签 --> </tr> </c:forEach>
可以用<c:if test="${not empty list}"></c:if> 和 <c:if test="${not empty list}"></c:if> 来处理是否为空的情况。如果不为空,显示值,为空的话,显示无记录等。
后台可以把list放到值栈或者放到request.例如:request.setAttribute("list", XXXXlist);
2:使用jsp内嵌Java代码遍历List (在后台把List放到session中,如果是大数据量,不应使用此方法)
首先在后台把list放入到session中
request.getSession().setAttribute(<span style="color:#ff0000;">Data.ALLNEWSLIST</span>, list);
红色标记的Data.ALLNEWSLIST 为常量 在com.xiami.onlineshop.common包下的Data类中定义
public static final String ALLNEWSLIST="ALLNEWSLIST";
jsp代码:
<%@ page language="java" import="java.util.*,<span style="color:#ff0000;">com.xiami.onlineshop.common.*,com.xiami.onlineshop.data.*" </span>pageEncoding="GBK"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body> <% String ntype=null; int pagenum=1; if(request.getParameter("pagecurrent")!=null){ pagenum=Integer.parseInt(request.getParameter("pagecurrent")); } List list=null; if(session.getAttribute(Data.ALLNEWSLIST)!=null){ list = (List)session.getAttribute(Data.ALLNEWSLIST); int l = list.size(); %> <table border=1 width="100%"> <tr bgcolor="#8E8E8E">>>首页>商城动态</tr> </table> <br><br> </font></center> <font color=#272727>第<%=pagenum %>页<Br><br></font> <table> <% for(int i=0;i<l;i++){ News news =(News)list.get(i); ntype=news.getNtype(); %> <tr bgcolor="#93FF93"> <td bgcolor="#6C6C6C"><%=news.getNid() %></td> <td bgcolor="#ADADAD"><a href="servlet/ShowDetailNews?nid=<%=news.getNid() %>"><%=news.getNtitle() %></a></td> </tr> <% } %> </table><br> <a href="servlet/ShowAllNews?page=1&type=<%=ntype %>">首页</a> <a href="servlet/ShowAllNews?page=<%=pagenum-1 %>&type=<%=ntype %>">上一页</a> <a href="servlet/ShowAllNews?page=<%=pagenum+1 %>&type=<%=ntype %>">下一页</a> <a href="servlet/ShowNewsEndPage?type=<%=ntype %>">尾页</a> <% } %> </body> </html>
3:使用Struts标签
<%@ taglib prefix="s" uri="/struts-tags"%>
<s:iterator value="#request.userList" status="stat" id="sd"> <tr align="center"> <td> <s:property value="#sd[6]" /> </td> <td> <s:property value="#sd[1]" /> <span style="WHITE-SPACE: pre"> </span></td> <td> <s:property value="#sd[2]"></s:property> </td> <td> <s:property value="#sd[4]"></s:property> </td> <td> <s:property value="#sd[5]"></s:property> </td> </tr> </s:iterator>