分页的工具类

package cn.util;


/**
 * 分页的工具类
 * 
 * 总共36条记录,每页10条,问:共几页?4页 当前页 起始条数 1 1 2 11 3 21 4 31 起始条数如何算出来的? (页数 - 1)*10 +
 * 1
 * 
 * ~生成读写器,做容错处理
 * @author sun
 *
 */
public class PageInfoUtil
{
/* 每页多少条 */
private int pageSize = 10;
/* 当前页 */
private int currentPage;
/* 总条数 */
private int totalRecord;


/* 上一页 */
private int prePage;
/* 下一页 */
private int nextPage;
/* 总页数 */
private int totalPage;
/* 当前记录数(每页的起始条数) */
private int currRecord;


public int getPageSize()
{
return pageSize;
}


public void setPageSize(int pageSize)
{
this.pageSize = pageSize;
}


public int getCurrentPage()
{
if(this.currentPage < 1)
{
this.currentPage = 1; 
}
if(this.getTotalPage() > 0 && this.currentPage > this.getTotalPage())
{
this.currentPage = this.getTotalPage() ; 
}
return currentPage;
}


public void setCurrentPage(int currentPage)
{
this.currentPage = currentPage;
}


public int getTotalRecord()
{
return totalRecord;
}


public void setTotalRecord(int totalRecord)
{
this.totalRecord = totalRecord;
}


public int getPrePage()
{
this.prePage = this.currentPage - 1 ; 
if(this.prePage < 1 )
{
this.prePage = 1 ; 
}
return prePage;
}


public int getNextPage()
{
this.nextPage = this.currentPage + 1 ;
if(this.nextPage > this.getTotalPage())
{
this.nextPage = this.getTotalPage() ; 
}
return nextPage;
}


public int getTotalPage()
{
/* 
* 总页数
* 
* 总条数 / 10 + 1 
* 
* 总条数如果是30条,每页10条,问多少页?
* */
this.totalPage = this.totalRecord / this.pageSize ; 
if(this.totalRecord % this.pageSize != 0 )
{
this.totalPage = this.totalRecord / this.pageSize + 1;
}
return totalPage;
}


public int getCurrRecord()
{
/* 当前页的起始条数如何算呢? 
* 不能加+1,
* Mysql的limit?,?是从0开始的.
* */
this.currRecord = (this.getCurrentPage() - 1 ) * this.getPageSize() ; 
return currRecord;
}


}