网上书店系统书籍分页功能

来源：互联网发布：深圳益玩网络编辑：程序博客网时间：2024/04/30 22:27

---------------------------------------------------------------action-----------------------------------------------------------------------------

public ActionForward execute(
 ActionMapping mapping,
 ActionForm form,
 HttpServletRequest request,
 HttpServletResponse response) throws ClassNotFoundException, SQLException
{

 ShoperForm shoppingForm = (ShoperForm) form;

 HttpSession session = request.getSession(false);
 ShoppingCart car = new ShoppingCart();
 car = (ShoppingCart) session.getAttribute("hash");

 ArrayList totlebook = (ArrayList)servlet.getServletContext().getAttribute("Bookdata");

 ArrayList pagebook = new ArrayList();
 /*page获得翻页时获取的页数,一开始默认的页数为第1页 */
 int page = 1;
 String spage = request.getParameter("page");
 if(spage == null)
 {
 page=1;
 }
 else
 {
 page = Integer.parseInt(spage);
 }
 /*sqan设置记录跨度*/
 int sqan=3;
 /*count获得总记录数*/
 int count = totlebook.size();
 /*countpages获得总页数*/
 int countpages = count/sqan ;
 if(count%sqan>0)
 {
 countpages=countpages+1;
 }
 /*翻上一页获得的page<1时,page还应设置为1*/
 if(page<1)
 {
 page=1;
 }
 /*翻下一页获得的page>最大页数时,page应设置为最大页数*/
 if(page>countpages)
 {
 page=countpages;
 }
 /*上一页页数*/
 int page1=page-1;
 /*下一页页数*/
 int page2=page+1;
 /*大于总记录数时*/
 int fcount=(page-1)*sqan+sqan;
 if(fcount>count)
 {
 fcount=count;
 }
 for(int i=(page-1)*sqan ; i<fcount ; i++)
 {
 pagebook.add(totlebook.get(i));
 }

 session.setAttribute("totlebook",pagebook);
 session.setAttribute("page", page);
 session.setAttribute("page1", page1);
 session.setAttribute("page2", page2);
 session.setAttribute("countpages",countpages);

 Enumeration e=request.getParameterNames();
 while(e.hasMoreElements())
 {
 String Bookname=(String) e.nextElement();
 String temp[]=Bookname.split(",");

 if(temp.length>2&&temp[0].equals("addbook"))
 {
 Book bk = new Book();
 bk.setIsbn(temp[1]);
 bk.setName(temp[2]);
 bk.setPrice(temp[3]);
 car.addBook(bk);
 }
 if(temp.length>2&&temp[0].equals("delete"))
 {
 car.delete(temp[1]);
 }
 }
 Book[] books = car.Booklist();
 session.setAttribute("books",books);
 return (mapping.findForward("success"));
 }

}

-------------------------------------------------------------------jsp-----------------------------------------------------------------------------

<%@ page language="java" import="java.util.*"%>
<%@ page contentType="text/html;charset=gb2312" language="java" import="java.util.*" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<c:set var="newUser" value="${user}" scope="session"/>
<c:set var="totlebook" value="${totlebook}" scope="session"/>
<c:set var="books" value="${books}" scope="session"/>
<c:set var="page" value="${page}" scope="session"/>
<c:set var="countpages" value="${countpages}" scope="session"/>
<c:set var="page1" value="${page1}" scope="session"/>
<c:set var="page2" value="${page2}" scope="session"/>
<html>
<head>
 <title>JSP for ShoperForm form</title>
</head>
<body>
Welcome to New Bookonline!<bean:write name="newUser" property="username"/> 
You can select books in your shoppingcart as follows: 
BookList: 
<html:form action='shoper.do'>
<c:forEach var="booklist" items="${totlebook}">
<LI><input type=checkbox name="addbook,${booklist.isbn},${booklist.name},${booklist.price}" value="addBook">
<c:out value="isbn:${booklist.isbn}"/>
<c:out value="${booklist.name}"/>
<c:out value="${booklist.price}"/> 
</c:forEach>
 第${page}/${countpages}页---<a href="shoper.do?page=${page1}">上一页</a>.<a href="shoper.do?page=${page2}">下一页</a> 

 <html:submit>
 <bean:message key="button.addBook"/>
 </html:submit>
</html:form> 

 Now In the ShoppingCar: 
 <c:if test="${empty books}">
 None
 </c:if>
 <html:form action='shoper.do'>
<c:forEach var="mybooklist" items="${books}">
 <LI><input type=checkbox name="delete,${mybooklist.isbn},${mybooklist.name},${mybooklist.price}" value=checkout>
 <c:out value="isbn:${mybooklist.isbn}"/>
 <c:out value="${mybooklist.name}"/>
 <c:out value="${mybooklist.price}"/> 
</c:forEach> 

<html:submit>
 <bean:message key="button.delete"/>
 </html:submit>
 </html:form> 

 <html:form action='checkout.do'>
 <html:submit value="checkout"/>
 </html:form> 
</body>
</html>

网上书店系统 书籍分页功能

网上书店系统书籍分页功能