JAva list汎用ページング方法
902 ワード
/**
pageNum:
pageSize:
**/
public static List startPageForCouponSorting(List list, Integer pageNum,Integer pageSize) {
if (list == null) {
return null;
}
if (list.size() == 0) {
return null;
}
Integer count = list.size(); //
Integer pageCount = 0; //
if (count % pageSize == 0) {
pageCount = count / pageSize;
} else {
pageCount = count / pageSize + 1;
}
int fromIndex = 0; //
int toIndex = 0; //
if (pageNum != pageCount) {
fromIndex = (pageNum - 1) * pageSize;
toIndex = fromIndex + pageSize;
} else {
fromIndex = (pageNum - 1) * pageSize;
toIndex = count;
}
if(fromIndex>=count){
return null;
}
List pageList = list.subList(fromIndex, toIndex);
return pageList;
}