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>
原文地址:https://www.cnblogs.com/wdpnodecodes/p/7413070.html