一个通用的Java分页基类代码详解

一个通用的Java分页基类代码详解

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?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 Phttp://ageBean() {

super();

// TODO Auto-generated constructor stub

}

@Override

public String toString() {

return "PageBean [count=" + count + ", end=" + end + ", list=" + list

+ ", pageCount=" +ipVRD 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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