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一个通用的Java分页基类代码详解

这篇文章主要介绍了一个通用的Java分页基类代码详解,具有一定借鉴价值,需要的朋友可以参考下。

分页的基类

 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  */ public class PageBean { 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 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&#63;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 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 getList() { return list; } public void setList(List list) { this.list = list; } }

servlet调用

 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 pb=new PageBean(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

 <%@ 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" %>                  ${message.title } ${message.editdate }
下一个[${pagebean.pageIndex }/${pagebean.pageSize}]

总结

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