package com.mshc.util;import java.util.Arrays;import java.util.Collections;import java.util.List;/**  * @author svs:  * @version 创建时间：2016-12-16 下午02:28:23  * 类说明  */public class ListPageUtil
     
       {    /**原集合*/    private List
      
        data;     /** 上一页 */    private int lastPage;    /** 当前页 */    private int nowPage;    /** 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
       
         data,int nowPage,int pageSize) {        if (data == null || data.isEmpty()) {            throw new IllegalArgumentException("data must be not empty!");        }         this.data = data;        this.pageSize = pageSize;        /*this.totalPage = data.size()/pageSize;        if(data.size()%pageSize!=0){            this.totalPage++;        }*/                this.nowPage = nowPage;        this.totalCount = data.size();        this.totalPage = (totalCount + pageSize - 1) / pageSize;        this.lastPage = nowPage-1>1? nowPage-1:1;        this.nextPage = nowPage>=totalPage? totalPage: nowPage + 1;            }     /**     * 得到分页后的数据     *     * @param pageNum 页码     * @return 分页后结果     */    public List
        
          getPagedList() {        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
         
           getData() {        return data;    }    public int getLastPage() {        return lastPage;    }    public int getNowPage() {        return nowPage;    }    public int getNextPage() {        return nextPage;    }    public int getTotalPage() {        return totalPage;    }    public int getTotalCount() {        return totalCount;    }   public static void main(String[] args) {
            Integer[] array = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};         List
          
            list = Arrays.asList(array);          // ListPageUtil
           
             pager = new ListPageUtil
            
             (list, 10);         ListPageUtil
             
               listPageUtil = new ListPageUtil
              
               (list,4, 5);         List
               
                 pagedList = listPageUtil.getPagedList();         System.out.println(pagedList);     }}