分页工具类

1、分页工具

package com.life.utils;

public class DividePage {

    
    /**
     * 总共有几页
     */
    private int pageSize;
    /**
     * 总共有多少条记录
     */
    private int recordCount;
    /**
     * 当前第几页
     */
    private int currentPage;    
    /**
     * 页面链接
     */
    private String pageUrl;

    public DividePage(int pageSize, int recordCount, int currentPage,String pageUrl) {
        super();
        
        this.pageSize = pageSize;
        this.recordCount = recordCount;
        this.pageUrl=pageUrl;
        setCurrentPage(currentPage);
    }

    public DividePage(int pageSize, int recordCount,String pageUrl) {
        this(pageSize, recordCount, 1,pageUrl);
    }

    public int getPageSize() {
        return pageSize;
    }

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


    /**
     * @return 总页数
     */
    public int getpageCount() {

        int size = recordCount / pageSize;
        int mod = recordCount % pageSize;
        if (mod != 0) {
            size++;
        }
        return recordCount == 0 ? 1 : size;
    }


    public int getFromIndex() {
        return (currentPage - 1) * pageSize;
    }

    public int getToIndex() {
        return pageSize;
    }

    public String get(){
        return "123";
    }

    public int getCurrentPage() {
        return currentPage;
    }

    /**
     * @param currentPage
     */
    public void setCurrentPage(int currentPage) {
        int ValidPage = currentPage <= 0 ? 1 : currentPage;
        ValidPage = ValidPage > getCurrentPage() ? getpageCount() : ValidPage;
        this.currentPage = currentPage;
    }

    public  String getPagination() {

        String url = pageUrl.contains("?") ? pageUrl : pageUrl + "?";
        if (!url.endsWith("?") && !url.endsWith("&")) {
            url += "&";
        }
        StringBuffer buffer = new StringBuffer();
        buffer.append("第" + currentPage + "/" + getpageCount() + " 页 共" + recordCount
                + "记录 ");
        buffer.append(currentPage == 1 ? "第一页" : "<a href='" + url
                + "page=1'>第一页</a> ");
        buffer.append(currentPage == 1 ? " 上一页" : "<a href='" + url + "page="
                + (currentPage - 1) + "'> 上一页</a> ");
        buffer.append(currentPage == getpageCount() ? " 下一页" : "<a href='" + url
                + "page=" + (currentPage + 1) + "'> 下一页</a> ");
        buffer.append(currentPage == getpageCount() ? " 最后一页" : "<a href='" + url
                + "page=" + getpageCount() + "'> 最后一页</a> ");
        return buffer.toString();
    }
    public int getpageSize() {
        return pageSize;
    }

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

    public int getRecordCount() {
        return recordCount;
    }

    public void setRecordCount(int recordCount) {
        this.recordCount = recordCount;
    }

}

2、使用

recordCount：记录总数,select count(*) from Coupon从数据库获得

page：第几页

dividePage ：分页的语句，应为action类的全局变量

 pageUrl 一般是action名称+?+其他除page值的参数

int recordCount;

recordCount = couponService.getTotalCount(
                    "select count(*) from Coupon", null);
coupons = couponService.list(page);

int currentPage = page;

String pageUrl = "showCoupons_manage";
DividePage dividePage = new DividePage(Constants.PageSize, recordCount,currentPage, pageUrl);
pageString = dividePage.getPagination();

3、jsp页面

<s:property value="pageString" escape="false" />

Done