1 简要说明
有时候，我们有一个list集合，需要对它进行分页处理
下面的根据类MyPageUtilVo就可以做到
它自带泛型，适合各种集合
可以设置每页的大小(默认为10)
根据页码(从1开始)就可以获取分页后的集合了
2 工具类
public class MyPageUtilVo<E>
{
/**
* 每页显示的记录数
*/
private int pageRecords = 10;
/
* 总记录数
*/
private int totalRecord;
/
* 分页切割的启始点
*/
private int startIndex;
/
* 分页切割的结束点
*/
private int endIndex;
/
* 总页数
*/
private int totalPage;
/
* 当前页数
*/
private int currentPage = 1;
/
* 总记录集合
*/
private List<E> totalList;
public MyPageUtilVo(List<E> totalList)
{
super();
this.totalList = totalList;
innit();
}
/
* 初始化该分页对象
*/
private void innit()
{
if (null != totalList)
{
totalRecord = totalList.size();
if (totalRecord % this.pageRecords == 0)
{
this.totalPage = totalRecord / this.pageRecords;
}
else
{
this.totalPage = totalRecord / this.pageRecords + 1;
}
}
}
/
* 得到分页后的数据
*
* @return 分页数据
*/
public List<E> getPage(int currentPage)
{
this.currentPage = currentPage;
if (currentPage <= 0)
{
this.currentPage = 1;
}
if (currentPage >= this.totalPage)
{
this.currentPage = this.totalPage;
}
List<E> subList = new ArrayList<E>();
if (null != this.totalList)
{
subList.addAll(this.totalList.subList(getStartIndex(), getEndIndex()));
}
return subList;
}
/
* 设置每页显示的记录条数,如果不设置则默认为每页显示10条记录
*
* @param pageRecords
* 每页显示的记录条数(值必需介于10~100之间)
*/
public void setPageRecords(int pageRecords)
{
if (pageRecords >= 10 && pageRecords <= 100)
{
this.pageRecords = pageRecords;
innit();
}
}
public int getStartIndex()
{
if (null == this.totalList)
{
return 0;
}
this.startIndex = (getCurrentPage() - 1) * this.pageRecords;
if (startIndex > totalRecord)
{
startIndex = totalRecord;
}
if (startIndex < 0)
{
startIndex = 0;
}
return startIndex;
}
public int getEndIndex()
{
if (null == this.totalList)
{
return 0;
}
endIndex = getStartIndex() + this.pageRecords;
if (endIndex < 0)
{
endIndex = 0;
}
if (endIndex < getStartIndex())
{
endIndex = getStartIndex();
}
if (endIndex > this.totalRecord)
{
endIndex = this.totalRecord;
}
return endIndex;
}
public int getTotalPage()
{
return totalPage;
}
public int getTotalRecord()
{
return totalRecord;
}
public boolean isEndPage()
{
return this.currentPage == this.totalPage;
}
/
* 获取下一页的页数
*
* @return 下一页的页数
*/
public int getNextPage()
{
int nextPage = this.currentPage + 1;
if (nextPage > this.totalPage)
{
nextPage = this.totalPage;
}
if (nextPage <= 0)
{
nextPage = 1;
}
return nextPage;
}
/
* 获取上一页的页数
*
* @return 上一页的页数
*/
public int getPrivyPage()
{
int privyPage = this.currentPage - 1;
if (privyPage > this.totalPage)
{
privyPage = this.totalPage;
}
if (privyPage <= 0)
{
privyPage = 1;
}
return privyPage;
}
public int getCurrentPage()
{
return currentPage;
}
}
3 示例
//对一个List<Map<String,String>>进行分页
int size = list.size();
MyPageUtilVo<Map<String,String>> pa = new MyPageUtilVo(list);
pa.setPageRecords(15); //设置每页数量
List<Map<String, String>> page = pa.getPage(1);
return getDataTable(page,size);
