分頁的基類
java/92761.html">java;">import java.util.List;/** * 分頁顯示的標準類,基本操作,是先給予-當前頁數一共的數據條數-每頁顯示的條數, * 然后在初始化該類,得到總共頁數,和開始序號和結束序號, * 然后數據庫分頁用到開始序號和結束序號,得到數據集合后賦值給該類的list屬性, * * 然后把該類發送到jsp頁面,進行訪問 * @author admin * * @param <T> */public class PageBean<T> { private int pageIndex; //當前頁數 private int pageSize; //一共的頁數 private int count; //數據條數 private int pageCount; //每頁的數據條數 private int start; //起始數據位置 private int end; //結束 private List<T> list=null; public void init(){ /*根count 和pageCount計算頁數pageSize */ int pageSize_x=(int)count/pageCount; if(count>=pageCount){ this.pageSize=count%pageCount==0?pageSize_x:pageSize_x+1; } else{ this.pageSize=1; } //判斷頁數和當前頁數 if(pageIndex>pageSize){ pageIndex=pageSize; } if(pageIndex<1){ pageIndex=1; } //根據當前頁計算起始和結束條目 this.start=(pageIndex-1)*pageCount+1; this.end=pageIndex*pageCount; } public PageBean(int pageIndex, int count, int pageCount) { super(); this.pageIndex = pageIndex; this.count = count; this.pageCount = pageCount; } public PageBean(int pageIndex, int count, int pageCount, List<T> list) { super(); this.pageIndex = pageIndex; this.count = count; this.pageCount = pageCount; this.list = list; } public PageBean() { super(); // TODO Auto-generated constructor stub } @Override public String toString() { return "PageBean [count=" + count + ", end=" + end + ", list=" + list + ", pageCount=" + pageCount + ", pageIndex=" + pageIndex + ", pageSize=" + pageSize + ", start=" + start + "]"; } public int getPageIndex() { return pageIndex; } public void setPageIndex(int pageIndex) { this.pageIndex = pageIndex; } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public int getCount() { return count; } public void setCount(int count) { this.count = count; } public int getPageCount() { return pageCount; } public void setPageCount(int pageCount) { this.pageCount = pageCount; } public int getStart() { return start; } public void setStart(int start) { this.start = start; } public int getEnd() { return end; } public void setEnd(int end) { this.end = end; } public List<T> getList() { return list; } public void setList(List<T> list) { this.list = list; }}servlet調用
import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.dao.MessageDao;import com.dao.impl.MessageDaoImpl;import com.vo.Message;import com.vo.PageBean;public class ShowMessageServlet extends HttpServlet{ /** * */ private static final long serialVersionUID = 6646899131087204214L; @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setCharacterEncoding("UTF-8"); resp.setContentType("text/html;charset=utf-8"); int pageIndex=0; MessageDao md=new MessageDaoImpl(); String pageIndexStr=req.getParameter("pageIndex"); if(pageIndexStr!=null){ try{ pageIndex=Integer.parseint(pageIndexStr); } catch (Exception e) { } } PageBean<Message> pb=new PageBean<Message>(pageIndex,md.getMessageCount(),10); pb.init(); pb.setList(md.getMessageListOfPage(pb.getStart(), pb.getEnd())); req.setAttribute("pagebean", pb); req.getRequestDispatcher("index.jsp").forward(req, resp); }}jsp頁面的顯示調用
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>" rel="external nofollow" > <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" > --> </head> <c:if test="${empty pagebean}"> <jsp:forward page="showmessage"></jsp:forward> </c:if> <body> <c:forEach var="message" items="${pagebean.list}"> ${message.title } ${message.editdate }<br/> </c:forEach> <a href="showmessage?pageIndex=${pagebean.pageIndex+1}" rel="external nofollow" >下一個</a>[${pagebean.pageIndex }<span>/</span>${pagebean.pageSize}] </body></html>總結
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