jsp - 如何仅使用 JSTL c :ForEach without javascript or jquery? 进行分页

Question

我听说可以仅使用 JSTL 进行分页。我已经看过并尝试了很多代码示例，但没有给出任何好的结果。我试过这个代码here返回一个空白页。到目前为止，下面的代码是我所拥有的并且它正在工作，但是如何显示下一个和上一个？

<c:forEach var="product" items="${categoryProducts}" begin="1" end="8" varStatus="iter">
<div class="product_container">

    <div class="product_img">
        <a href="viewProduct?${product.id}">    <img class="product_picture" alt="" src="${initParam.productGalleryImagePath}${product.id} (1).jpg" /></a>
    </div>


    <div class="product_name">
        <a href="viewProduct?${product.id}">${product.name}</a>
    </div>


    <div class="product_price">

        <a href="viewProduct?${product.id}">$${product.price}</a>

    </div>

</div>
</c:forEach>

<div class="pagination">
     <c:if test="${product.start > 1}">
 NEXT
</c:if>
<c:if test="${product.end} < ${fn:length(product)}">
 PREVIOUS
</c:if>
</div>

rickz代码:

   <c:set var="product" scope="session" value="${categoryProducts}"/>
<c:set var="totalCount" scope="session" value="${categoryProducts}"/>
<c:set var="perPage" scope="session"  value="10"/>
<c:set var="pageStart" value="${param.start}"/>
<c:if test="${empty pageStart or pageStart < 0}">
       <c:set var="pageStart" value="0"/>
</c:if>
<c:if test="${totalCount < pageStart}">
       <c:set var="pageStart" value="${pageStart - 10}"/>
</c:if>
    <a href="category.jsp?start=${pageStart - 10}">Previous</a>${pageStart + 1} - ${pageStart + 10} 
    <a href="category.jsp?start=${pageStart + 10}">Next</a>  

Answer 1

这是一个演示。

<%@ page import="java.util.*" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> 
<%
   List<String> letters = Arrays.asList("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");
%>
<c:set var="letters" scope="session" value="<%=letters%>"/>
<c:set var="totalCount" scope="session" value="<%=letters.size()%>"/>
<c:set var="perPage" scope="session"  value="10"/>
<c:set var="pageStart" value="${param.start}"/>
<c:if test="${empty pageStart or pageStart < 0}">
       <c:set var="pageStart" value="0"/>
</c:if>
<c:if test="${totalCount < pageStart}">
       <c:set var="pageStart" value="${pageStart - 10}"/>
</c:if>
    <a href="?start=${pageStart - 10}"><<</a>${pageStart + 1} - ${pageStart + 10} 
    <a href="?start=${pageStart + 10}">>></a>                                               
<h1>Letters</h1>
   <c:forEach var="letter" items="${letters}" varStatus="letterCounter"
                        begin="${pageStart}" end="${pageStart + perPage - 1}">
              ${letter}
   </c:forEach>

编辑:

categoryProducts 是什么类型的对象？
你需要找到它的大小。您可以尝试添加

<%@ taglib prefix = "fn" uri = "http://java.sun.com/jsp/jstl/functions" %>

并尝试使用

<c:set var="totalCount" scope="session" value="${fn:length(categoryProducts)}"/>

编辑2:

<%@ page import="java.util.*" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> 
<%
   List<String> letters = Arrays.asList("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");
%>
<c:set var="letters" scope="session" value="<%=letters%>"/>
<c:set var="totalCount" scope="session" value="<%=letters.size()%>"/>
<c:set var="perPage" scope="session"  value="${5}"/>
<c:set var="pageStart" value="${param.start}"/>
<c:if test="${empty pageStart or pageStart < 0}">
       <c:set var="pageStart" value="0"/>
</c:if>
<c:if test="${totalCount < pageStart}">
       <c:set var="pageStart" value="${pageStart - perPage}"/>
</c:if>
    <a href="?start=${pageStart - perPage}"><<</a>${pageStart + 1} - ${pageStart + perPage} 
    <a href="?start=${pageStart + perPage}">>></a>                                               
<h1>Letters</h1>
   <c:forEach var="letter" items="${letters}" 
                        begin="${pageStart}" end="${pageStart + perPage - 1}">
              ${letter}
   </c:forEach>