java实现分页组件

package com.face.common;

import lombok.Getter;
import lombok.Setter;

import java.util.ArrayList;
import java.util.List;

@Getter
@Setter
public class Page<T> {
private int pageIndex;
private int pageSize;
private int totalItemCount;
private int totalPageCount;
private List<T> data;

/**
*
* @param pageIndex // 当前第多少页
* @param pageSize // 每页大小
* @param totalItemCount // 总数
* @param data // 数据载体
* @param hasPaged // 是否已经分页
*/
public Page(int pageIndex, int pageSize, int totalItemCount, List<T> data, boolean hasPaged) {
this.pageIndex = pageIndex;
this.pageSize = pageSize;
this.totalItemCount = totalItemCount;
initPage(pageIndex, pageSize, totalItemCount, data, hasPaged);
}

private void initPage(int pageIndex, int pageSize, int totalItemCount, List<T> data, boolean hasPaged) {
// 计算总页数
if (totalItemCount > 0 && pageSize > 0) {
this.totalPageCount = totalItemCount/pageSize + 1;
}
// 截取当前页数据
if (null == data) {
this.data = new ArrayList<T>();
} else if (data.isEmpty() || hasPaged) {
this.data = data;
} else {
if (pageIndex == this.totalPageCount) { // 最后一页
this.data = data.subList((pageIndex-1)*pageSize, data.size());
} else if (pageIndex < this.totalPageCount) { // 不是最后一页
this.data = data.subList((pageIndex-1)*pageSize, pageIndex*pageSize);
} else { // 当前页超出总页数
throw new IndexOutOfBoundsException("当前页数超出总页数范围");
}
}
}

}