针对list集合进行分页展示

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;
     }
 }