pagehoder.java

jsp+servlet网上购物,是一个实现mvc的网站

package com.ebook.Util;

import java.util.*;

public class PageHoder {

    private List list;
    private int pageSize;
    private int currentPage=0;

    public PageHoder(List list, int pageSize) {
        this.list = list;
        this.pageSize = pageSize;
    }

    public int getListSize() {
        return list.size();
    }

    public int getPageNumber(int pageSize) {
        int pageNumber = 0;
        if (getListSize() % pageSize > 0) {
            pageNumber = getListSize() / pageSize + 1;
        } else {
            pageNumber = getListSize() / pageSize;
        }
        return pageNumber;
    }

    public int getCurrentPage() {
        return currentPage;
    }

    public boolean isFirstPage() {
        if(getCurrentPage() == 0)
        {
          return true;
        }
        else
            return false;
    }

    public boolean isLastPage() {
       if(getCurrentPage() == getPageNumber(pageSize))
       {
           return true;
       }
       else
           return false;
    }

    public void nextPage() {
        if (!isLastPage()) {
            currentPage++;
        }
    }

    public void lastPage() {
        if (!isFirstPage()) {
            currentPage--;
        }
    }

    public List getCurrentList(int currentPage) {
        return list.subList((currentPage-1) * pageSize,currentPage * pageSize);
    }

    public List getSource() {
        return list;
    }
}