分页的基类
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import java.util.List; /** * 分页显示的标准类,基本操作,是先给予-当前页数一共的数据条数-每页显示的条数, * 然后在初始化该类,得到总共页数,和开始序号和结束序号, * 然后数据库分页用到开始序号和结束序号,得到数据集合后赋值给该类的list属性, * * 然后把该类发送到jsp页面,进行访问 * @author admin * * @param <T> */ public class PageBean<T> { private int pageIndex; //当前页数 private int pageSize; //一共的页数 private int count; //数据条数 private int pageCount; //每页的数据条数 private int start; //起始数据位置 private int end; //结束 private List<T> list= null ; public void init(){ /*根count 和pageCount计算页数pageSize */ int pageSize_x=( int )count/pageCount; if (count>=pageCount){ this .pageSize=count%pageCount== 0 ?pageSize_x:pageSize_x+ 1 ; } else { this .pageSize= 1 ; } //判断页数和当前页数 if (pageIndex>pageSize){ pageIndex=pageSize; } if (pageIndex< 1 ){ pageIndex= 1 ; } //根据当前页计算起始和结束条目 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调用
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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页面的显示调用
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<%@ 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" >下一个</ a >[${pagebean.pageIndex }< span >/</ span >${pagebean.pageSize}] </ body > </ html > |
总结
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原文链接:http://www.open-open.com/code/view/1426342709482