Jsp遍历后台传过来的List三种方法

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


  1. <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>  


然后使用foreach标签


  1. <c:forEach items="${list}" var="user" varStatus="vs">  
  2.         <tr>  
  3.               
  4.              <td>  
  5.                 <s:property value="#vs.index+1"/>  
  6.              td>  
  7.              <td align = "center">${user.PId}td>  
  8.              <td align = "center">${user.PLoginname}td>  
  9.              <td align = "center">${user.PUserName}td>  
  10.              <td align = "center">${user.PEmail}td>  
  11.              <td align = "center"><html:department pdeptid="${user.PDeptid}">html:department>td>   
  12.          tr>  
  13. c:forEach>  

可以用   和 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

copy
  1. request.getSession().setAttribute(<span style="color:#ff0000;">Data.ALLNEWSLISTspan>, list);  

红色标记的Data.ALLNEWSLIST 为常量 在com.xiami.onlineshop.common包下的Data类中定义

copy
  1. public static final String ALLNEWSLIST="ALLNEWSLIST";  


jsp代码:(注意标红的代码不要忘记引入对应的类)


  1. <%@ page language="java" import="java.util.*,<span style="color:#ff0000;">com.xiami.onlineshop.common.*,com.xiami.onlineshop.data.*" span>pageEncoding="GBK"%>  
  2.   
  3. >  
  4. <html>  
  5.   <head>  
  6.      
  7.   head>  
  8.     
  9.   <body>  
  10.     <%     
  11.         String ntype=null;  
  12.         int pagenum=1;  
  13.         if(request.getParameter("pagecurrent")!=null){   
  14.         pagenum=Integer.parseInt(request.getParameter("pagecurrent"));   
  15.     }   
  16.         List list=null;  
  17.         if(session.getAttribute(Data.ALLNEWSLIST)!=null){  
  18.             list = (List)session.getAttribute(Data.ALLNEWSLIST);  
  19.             int l = list.size();  
  20.             %>  
  21.         <table border=1 width="100%">  
  22.         <tr bgcolor="#8E8E8E">>>首页>商城动态tr>  
  23.         table>  
  24.               
  25.                   
  26.             <br><br>    font>center>  
  27.             <font color=#272727><%=pagenum %><Br><br>font>  
  28.                 <table>  
  29.             <%  
  30.             for(int i=0;i<l;i++){  
  31.                 News news =(News)list.get(i);  
  32.                 ntype=news.getNtype();  
  33.                   
  34.                 %>  
  35.                     <tr bgcolor="#93FF93">  
  36.                         <td bgcolor="#6C6C6C"><%=news.getNid() %>td>  
  37.                         <td bgcolor="#ADADAD"><a href="servlet/ShowDetailNews?nid=<%=news.getNid() %>"><%=news.getNtitle() %>a>td>  
  38.                           
  39.                     tr>  
  40.                 <%  
  41.             }  
  42.             %>  
  43.               
  44.                 table><br>  
  45.                 <a href="servlet/ShowAllNews?page=1&type=<%=ntype %>">首页a>   
  46.                 <a href="servlet/ShowAllNews?page=<%=pagenum-1 %>&type=<%=ntype %>">上一页a>   
  47.                 <a href="servlet/ShowAllNews?page=<%=pagenum+1 %>&type=<%=ntype %>">下一页a>   
  48.                 <a href="servlet/ShowNewsEndPage?type=<%=ntype %>">尾页a>  
  49.                   
  50.             <%  
  51.         }  
  52.      %>  
  53.   body>  
  54. html>  



3:使用Struts标签


co
  1. <%@ taglib prefix="s" uri="/struts-tags"%>  

cop
  1. <s:iterator value="#request.userList" status="stat" id="sd">  
  2.                             <tr align="center">  
  3.                                 <td>  
  4.                                     <s:property value="#sd[6]" />  
  5.                                 td>  
  6.                                 <td>  
  7.                                     <s:property value="#sd[1]" />                             <span style="WHITE-SPACE: pre">                         span>td>  
  8.                                 <td>  
  9.                                     <s:property value="#sd[2]">s:property>  
  10.                                 td>  
  11.                                 <td>  
  12.                                     <s:property value="#sd[4]">s:property>  
  13.                                 td>  
  14.                                 <td>  
  15.                                     <s:property value="#sd[5]">s:property>  
  16.                                 td>  
  17.                             tr>  
  18. s:iterator>  

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