package
Servlet;
import java.util.*;
/**
* <p>Title: PageResultSet</p>
*
* <p>Description:分页类 </p>
*
* <p>Copyright: Copyright (c) 2004</p>
*
* <p>Company:youngor-studio(http://www.54youngor.com) </p>
* @author:伍维波
* @version 1.0
*/
public
class PageResultSet {
/**
* 分页数据
*/
private List data = null;
/**
* 当前页
*/
private static int curPage;
/**
* 每页显示的记录数
*/
private static int pageSize;
/**
* 记录行数
*/
private static int rowsCount;
/**
* 页数
*/
private static int pageCount;
public PageResultSet(List data) {
this.data = data;
this.curPage = 1;
this.pageSize = 10;
this.rowsCount = data.size();
this.pageCount = (int) Math.ceil((double) rowsCount / pageSize);
}
public PageResultSet(List 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(List 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;
}
/**
* 第一页
* @return boolean
*/
public boolean isLast() {
return (curPage==pageCount)?true:false;
}
/**
* 获取当前页数据
* @return Collection
*/
public List getData() {
List 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 = (List) arrayCurData;
} else {
curData = (List) 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' 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 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;
}
}