一个实用的JSP分页代码

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有热心网友回复：
str += " 转到select name='page' onChange="window.location.href='" + fileName + temp + "cur_page='+this.options[this.selectedIndex].value"";
已经试过了，没问题

1.以下是实现分页的类PageResultSet
代码如下：

package page.bean;
import java.util.*;
public class PageResultSet {
/**
* 分页数据
*/
private Collection data = null;
/**
* 当前页
*/
private int curPage;
/**
* 每页显示的记录数
*/
private int pageSize;
/**
* 记录行数
*/
private int rowsCount;
/**
* 页数
*/
private int pageCount;
public PageResultSet(Collection data) {
this.data = data;
this.curPage = 1;
this.pageSize = 10;
this.rowsCount = data.size();
this.pageCount = (int) Math.ceil((double) rowsCount / pageSize);
}
public PageResultSet(Collection data, int curPage) {
this.data = data;
this.curPage = curPage;
this.pageSize = 10;
this.rowsCount = data.size();
this.pageCount = (int) Math.ceil((double) rowsCount / pageSize);
}
public PageResultSet(Collection data, int curPage, int pageSize) {
this.data = data;
this.curPage = curPage;
this.pageSize = pageSize;
this.rowsCount = data.size();
this.pageCount = (int) Math.ceil((double) rowsCount / pageSize);
}
/**
* getCurPage:返回当前的页数
*
* @return int
*/
public int getCurPage() {
return curPage;
}
/**
* getPageSize：返回分页大小
*
* @return int
*/
public int getPageSize() {
return pageSize;
}
/**
* getRowsCount：返回总记录行数
*
* @return int
*/
public int getRowsCount() {
return rowsCount;
}
/**
* getPageCount：返回总页数
*
* @return int
*/
public int getPageCount() {
return pageCount;
}
/**
* 第一页
*
* @return int
*/
public int first() {
return 1;
}
/**
* 最后一页
*
* @return int
*/
public int last() {
return pageCount;
}
/**
* 上一页
*
* @return int
*/
public int previous() {
return (curPage - 1 1) ? 1 : curPage - 1;
}
/**
* 下一页
*
* @return int
*/
public int next() {
return (curPage + 1 pageCount) ? pageCount : curPage + 1;
}
/**
* 第一页
*
* @return boolean
*/
public boolean isFirst() {
return (curPage == 1) ? true : false;
}
/**
* 最后一页
*
* @return boolean
*/
public boolean isLast() {
return (curPage == pageCount) ? true : false;
}
/** * 获取当前页数据
*
* @return Collection
*/
public Collection getData() {
Collection curData = null;
if (data != null) {
int start = (curPage - 1) * pageSize;
int end = 0;
if (start + pageSize rowsCount)
end = rowsCount;
else
end = start + pageSize;
ArrayList arrayCurData = new ArrayList();
ArrayList arrayData = null;
Vector vectorCurData = new Vector();
Vector vectorData = null;
boolean isArray = true;
if (data instanceof ArrayList) {
arrayData = (ArrayList) data;
isArray = true;
} else if (data instanceof Vector) {
vectorData = (Vector) data;
isArray = false;
}
for (int i = start; i end; i++) {
if (isArray) {
arrayCurData.add(arrayData.get(i));
} else {
vectorData.add(vectorData.elementAt(i));
}
}
if (isArray) {
curData = (Collection) arrayCurData;
} else {
curData = (Collection) vectorCurData;
}
}
return curData;
}
/**
* 获取工具条
*
* @return String
*/
public String getToolBar(String fileName) {
String temp = "";
if (fileName.indexOf("?") == -1) {
temp = "?";
} else {
temp = "&";
}
String str = "form method='post' name='frmPage' action='" + fileName + "'";
str += "p align='center'";
if (isFirst())
str += "首页 上一页 ";
else {
str += "a href='" + fileName + temp + "cur_page=1'首页/a ";
str += "a href='" + fileName + temp + "cur_page=" + (curPage - 1) + "'上一页/a ";
}
if (isLast())
str += "下一页 尾页 ";
else {
str += "a href='" + fileName + temp + "cur_page=" + (curPage + 1) + "'下一页/a ";
str += "a href='" + fileName + temp + "cur_page=" + pageCount + "'尾页/a ";
}
str += " 共b" + rowsCount + "/b条记录 ";
str += " 转到select name='page' onChange="location='" + fileName
+ temp + "cur_page='+this.options[this.selectedIndex].value"";
for (int i = 1; i = pageCount; i++) {
if (i == curPage)
str += "option value='" + i + "' selected第" + i + "页/option";
else
str += "option value='" + i + "'第" + i + "页/option";
}
str += "/select/p/form";
return str;
}
}

2.一下是Action
代码如下：

/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package struts.action;
import java.util.Collection;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import page.bean.DatabaseConn;
import page.bean.PageResultSet;
import page.bean.ContactBO;
import struts.form.LoginForm;
/**
* MyEclipse Struts
* Creation date: 04-02-2008
*
* XDoclet definition:
* @struts.action path="/login" name="loginForm" input="/login.jsp" scope="request" validate="true"
* @struts.action-forward name="sss" path="/index.jsp"
*/
public class LoginAction extends Action {
/*
* Generated Methods
*/
/**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
LoginForm loginForm = (LoginForm) form;
ContactBO userBO=new ContactBO();
//先从业务处理逻辑类中取出数据(ArrayList或Vector格式)
Collection data;
try {
data = userBO.findContact(DatabaseConn.getConnection());
//再得到当前页curPage和每页记录数pageSize
//int curPage = Integer.parseInt((String)request.getParameter("cur_page"));
int curPage = 1;
String cur = request.getParameter("cur_page");
System.out.println("--------------: "+cur);
if(cur!=null && cur !=""){
curPage = new Integer(cur).intValue();
}
int pageSize=10;
//然后生成PageResultSet对象
PageResultSet dataList = new PageResultSet(data, curPage, pageSize);
request.setAttribute("usersList", dataList);
return mapping.findForward("sss");
} catch (Exception e) {
e.printStackTrace();
return mapping.getInputForward();
}
}
}

3.以下是显示分页的页面
代码如下：

%@ page language="java" import="java.util.*,page.bean.Contact,page.bean.PageResultSet"
pageEncoding="gb2312"%
%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
base href="%=basePath%"
titleMy 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"
--
/head
body
table
%
PageResultSet pageResultSet = (PageResultSet) request.getAttribute("usersList");
ArrayList usersList = (ArrayList) pageResultSet.getData();
for (int i = 0; i usersList.size(); i++) {
Contact co = (Contact) usersList.get(i);
%
tr
td
%=co.getId() %
/td
td
a href="login.do?id=%=co.getId()%"%=co.getUsername()%/a
/td
td
%=co.getMobile() %
/td
td
%=co.getMail() %
/td
td
%=co.getPhone() %
/td
td
%=co.getMem() %
/td
td
%=co.getLastcontact() %
/td
/tr
%
}
%
/table
!-- 显示分页工具栏 --
%=pageResultSet.getToolBar("login.do")%
/body
/html