分页设计

java通用分页导航设计

工作中经常会有表格数据的展示，数据量少时还好，一旦数据量特别大时，我们就要考虑分页以降低数据库的压力，那么下面简单介绍下我的分页导航设计，不对的地方望指正。

1.首先我们新建一个通用的分页类PgeUtils

public class PageResult<T> {


    private int totalpage;//总页码
    private int totalcount;//总条数
    private int pagenum;//当前页码
    private int pagesize = 10;//初始化每页数量
    private List<T> list;

    public int getPagenum() {
        return pagenum;
    }
    public void setPagenum(int pagenum) {
        this.pagenum = pagenum;
    }
    public int getPagesize() {
        return pagesize;
    }
    public void setPagesize(int pagesize) {
        this.pagesize = pagesize;
    }
    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<T> getList() {
        return list;
    }
    public void setList(List<T> list) {
        this.list = list;
    }

}

2.如何动态生成分页导航栏

思路：
分页导航无非由以下几个部分组成
首页，尾页，上一页，下一页以及具体的每个页码
下面是具体代码实现（此处使用了inspinia的样式。万变不离其宗，大概的思想都一样。）

public class PageUtil {

    /**
     * 获取分页html
     * 
     * @param url要跳转的url
     * @param pagecount总页数
     * @param pageCurrent当前页码
     * @param pagesize每页的数据量
     * @return
     */
    public static String getPaginationHtml(String url, Integer pagecount, Integer pageCurrent, Integer pagesize) {
        if (pagecount == 0) {
            return "";
        }
        String urlNew = url.replace("{pagesize}", pagesize + "").replace("{pagecount}", pagecount + "");
        String first = urlNew.replace("{pageCurrent}", 1 + "");
        String prev = urlNew.replace("{pageCurrent}", (pageCurrent - 1) + "");
        String next = urlNew.replace("{pageCurrent}", (pageCurrent + 1) + "");
        String last = urlNew.replace("{pageCurrent}", pagecount + "");

        StringBuffer html = new StringBuffer();
        html.append("<li class=\"footable-page-arrow" + (pageCurrent <= 1 ? " disabled" : "") + "\"><a href=\""
                + (pageCurrent <= 1 ? "#" : first) + "\">«</a></li>");
        html.append("<li class=\"footable-page-arrow" + (pageCurrent <= 1 ? " disabled" : "") + "\"><a href=\""
                + (pageCurrent <= 1 ? "#" : prev) + "\">‹</a></li>");
        for (int i = 0; i < pagecount; i++) {
            String urlItem = urlNew.replace("{pageCurrent}", (i + 1) + "");
            html.append("<li class=\"footable-page" + (((i + 1) == pageCurrent) ? " active" : "") + "\"><a href=\""
                    + urlItem + "\">" + (i + 1) + "</a></li>");
        }
        html.append("<li class=\"footable-page-arrow" + (pageCurrent == pagecount ? " disabled" : "") + "\"><a href=\""
                + (pageCurrent == pagecount ? "#" : next) + "\">›</a></li>");
        html.append("<li class=\"footable-page-arrow" + (pageCurrent == pagecount ? " disabled" : "") + "\"><a href=\""
                + (pageCurrent == pagecount ? "#" : last) + "\">»</a></li>");

        return html.toString().replaceAll("null", "");
    }
}

3.再来看看如何调用这个获取分页导航的具体代码及效果图

String paginationHtml = PageUtil.getPaginationHtml(
                "/project/index?pagecount={pagecount}&pageCurrent={pageCurrent}&pagesize={pagesize}", pagecount,pageCurrent, pagesize);

4.总结

此文简单讲解了一种动态获取分页导航的方式，实现的方式有很多种，如有不对之处，请不吝指正。