传入一个List集合，返回分页好的数据

传入一个List集合，返回分页好的数据。

定义分页信息类：

package com.cn.common;

import java.util.List;

public class CommonPage<T> {

    private int currentPage;

    private int totalPage;

    private int pageSize;

    private java.util.List<T> list;

    public CommonPage (int currentPage, int totalPage, int pageSize, List<T> list) {
        this.currentPage = currentPage;
        this.totalPage = totalPage;
        this.pageSize = pageSize;
        this.list = list;
    }

    public CommonPage() {
    }

    public int getCurrentPage() {
        return currentPage;
    }

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

    public int getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }

    public int getPageSize() {
        return pageSize;
    }

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

    public List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        this.list = list;
    }
}

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给出总的List和页数，每页大小获取指定页数的数据。

 public CommonPage<User> getPage(int pageNo,int pageSize,List<User> users){
        //总页数
        int totalCount = users.size();

        // 计算分页数
        int pageCount = (totalCount + pageSize - 1) / pageSize;

        //计算从List中的开始索引
        int startIndex = (pageNo - 1) * pageSize;

        //计算从List中的结束索引
        int endIndex = Math.min(startIndex + pageSize, totalCount);

        //返回空
        if (startIndex >= endIndex) {
            return new CommonPage<User>(pageNo,totalCount,pageSize,Collections.emptyList());
        }
        //返回指定页数的数据
        return new CommonPage<User>(pageNo,totalCount,pageSize,users.subList(startIndex, endIndex));
    }