直接定义个工具类，代码如下：
package com.jk51.modules.wechat.web.util; import java.util.Collections;
import java.util.List; /**
* 版权所有(C) 2018 * 作者: chen
* 创建日期: 2018/6/20
* 修改记录:
*/
public class ListPageUtil<T> {
private List<T> data; /** 上一页 */
private int lastPage; /** 当前页 */
private int currentPage; /** 下一页 */
private int nextPage;
//
/** 每页条数 */
private int pageSize; /** 总页数 */
private int totalPage; /** 总数据条数 */
private int totalCount; public ListPageUtil(List<T> data,int currentPage,int pageSize) {
if (data == null || data.isEmpty()) {
throw new IllegalArgumentException("data must be not empty!");
} this.data = data;
this.pageSize = pageSize;
this.currentPage = currentPage;
this.totalCount = data.size();
this.totalPage = (totalCount + pageSize - 1) / pageSize;
this.lastPage = currentPage-1>1? currentPage-1:1;
this.nextPage = currentPage>=totalPage? totalPage: currentPage + 1; } /**
* 得到分页后的数据
* @return 分页后结果
*/
// public List<T> getPagedLst() {
// int fromIndex = (nowPage - 1) * pageSize;
// if (fromIndex >= data.size()) {
// return Collections.emptyList();//空数组
// }
// if(fromIndex<0){
// return Collections.emptyList();//空数组
// }
// int toIndex = nowPage * pageSize;
// if (toIndex >= data.size()) {
// toIndex = data.size();
// }
// return data.subList(fromIndex, toIndex);
// } public int getPageSize() {
return pageSize;
} public List<T> getData() {
int fromIndex = (currentPage - 1) * pageSize;
if (fromIndex >= data.size()) {
return Collections.emptyList();//空数组
}
if(fromIndex<0){
return Collections.emptyList();//空数组
}
int toIndex = currentPage * pageSize;
if (toIndex >= data.size()) {
toIndex = data.size();
}
return data.subList(fromIndex, toIndex);
}
public int getLastPage() {
return lastPage;
} public int getCurrentPage() {
return currentPage;
} public int getNextPage() {
return nextPage;
} public int getTotalPage() {
return totalPage;
} public int getTotalCount() {
return totalCount;
}
}