分页工具类

最新推荐文章于 2021-03-12 19:06:03 发布

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最新推荐文章于 2021-03-12 19:06:03 发布

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分类专栏：工具类

本文链接：https://blog.youkuaiyun.com/qq_38331606/article/details/83614601

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本文介绍了一个Java分页组件的设计与实现细节，包括如何计算总页数、设置分页显示逻辑，以及如何处理页面参数。通过实例展示了如何使用该组件进行分页操作。

package com.wpao.util;

import java.util.List;

public class Pagination {

   private int pageNo=1;
   private int pageSize=15;
   private int totalPage;
   private int totalCount;

   private int onepage;
   private int lstpage;

   private List list;

   public Pagination() {
       //
   }

   //计算总分页数:
   public int GetPageCount(int totalRec,int pgeRec) {
       int pageCount = 0;
       if (totalRec % pgeRec == 0) {
           pageCount = totalRec/pgeRec;
        }else {
           pageCount = totalRec/pgeRec + 1;
        }
        if(pageCount <= 0) {
           pageCount = 1;
        }
        return pageCount;
   }

   //分页页码显示:
   public void SetPageShow(Pagination pagination) {

       int pagecode = pagination.getPageNo();
       int pagecount = pagination.getTotalPage();
       int ipage = 0;
       if(pagecount > 9 && pagecode > 5){
           if(pagecount == pagecode){//总页码45,当前页45
               ipage = pagecode-8;
           } else if(pagecount-1 == pagecode){//总页码45,当前页44
               ipage = pagecode-7;
           } else if(pagecount-2 == pagecode){//总页码45,当前页43
               ipage = pagecode-6;
           } else if(pagecount-3 == pagecode){//总页码45,当前页42
               ipage = pagecode-5;
           } else {//总页码45,当前页41
               ipage = pagecode-4;
           }
       } else {
           ipage = 1;//总页码小于等于9,或者当前页小于等于5
       }

       int cpage = 0;
       if(pagecount > 9) {
           if(pagecode > 5) {
               if(pagecode != pagecount) {
                   cpage = ((pagecode + 4) > pagecount) ? pagecount : pagecode + 4;
               }else {
                   cpage = pagecount;
               }
           }else {
               cpage = 9;
           }
       }else {
           cpage = pagecount;
       }
       pagination.setOnepage(ipage);
       pagination.setLstpage(cpage);
   }

   public int getPageNo() {
       return pageNo;
   }

   public void setPageNo(int pageNo) {
       this.pageNo = pageNo;
   }

   public int ParseInt(String para_str,int defaultvalue) {
        if(para_str!=null && !para_str.equals("")) {
           try {
               return Integer.parseInt(para_str);
            }catch (Exception e) {
               return defaultvalue;
            }
        }
       return defaultvalue;
    }

   public int getPageSize() {
       return pageSize;
   }

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

   public int getOnepage() {
       return onepage;
   }

   public void setOnepage(int onepage) {
       this.onepage = onepage;
   }

   public int getLstpage() {
       return lstpage;
   }

   public void setLstpage(int lstpage) {
       this.lstpage = lstpage;
   }

   public int getTotalPage() {
       return totalPage;
   }

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

   public int getTotalCount() {
       return totalCount;
   }

   public void setTotalCount(int totalCount) {
       this.totalCount = totalCount;
   }

   public List getList() {
       return list;
   }

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



   @Override
   public String toString() {
       return "Pagination [pageNo=" + pageNo + ", pageSize=" + pageSize
               + ", totalPage=" + totalPage + ", totalCount=" + totalCount
               + ", onepage=" + onepage + ", lstpage=" + lstpage + ", list="
               + list + "]";
    }
}

客户端调用

    public static void main(String[] args) {
       String pageStr= "2";//当前页码;
        Pagination fyb = new Pagination();
        //1、封装分页对象
        fyb.setTotalCount(100);//总条数
        fyb.setPageSize(10);//每页显示数
        fyb.setTotalPage(fyb.GetPageCount(fyb.getTotalCount(), fyb.getPageSize()));//总页数

        int pageNo = 1;
        if(pageStr!=null && !pageStr.equals("")) {
           try {
               pageNo = Integer.parseInt(pageStr);
            }catch (Exception e) {

            }
        }
        if (pageNo>fyb.getTotalPage()){
            pageNo = fyb.getTotalPage();
        }else if (pageNo<1){
            pageNo=1;
        }

        fyb.setPageNo(pageNo);//当前页的编号.
        fyb.SetPageShow(fyb); //执行内部计算，获得开始页码，终止页码
        System.out.println(fyb);
   }