package com.jingcheng.template.util;

import com.alibaba.fastjson.JSONObject;

import java.util.List;

public class PageUtils {

    public static JSONObject page(List<?> list, Integer pageNum, Integer pageSize){
        int page = pageNum;//相当于pageNo
        int count = pageSize;//相当于pageSize
        int size = list.size();
        int pageCount=size/count;
        int fromIndex = count * (page - 1);
        int toIndex = fromIndex + count;
        if (toIndex >= size) {
            toIndex = size;
        }
        if(page>pageCount+1){
            fromIndex=0;
            toIndex=0;
        }
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("list",list.subList(fromIndex, toIndex));
        jsonObject.put("total",size);
        jsonObject.put("pageNum",pageNum);
        jsonObject.put("pageSize",pageSize);
        return jsonObject;
    }
}