Java 动态分页类

 动态分页类： Cls_page.java

package pagination;

public class Cls_page {
    private int nums;// 总条目数
    private int current_page;// 当前被选中的页码
    private int sub_pages;// 每次显示的页数
    private int pageNums;// 总页数
    private int[] page_array;// 用来构造分页的数组
    private String subPage_link;// 每个分页的链接

    /**
     * 
     * Cls_page是的构造函数，用来在创建类的时候自动运行.
     * 
     * @disNums 列表记录显示条数
     * @nums 总条目数
     * @current_page 当前被选中的页
     * @sub_pages 每次显示的页数
     * @subPage_link 每个分页的链接
     * 
     *               函数subPageCss()： 当前第1/453页 [首页] [上页] 1 2 3 4 5 6 7 8 9 10
     *               [下页] [尾页]
     */

    public Cls_page(int disNums, int nums, int current_page, int sub_pages,
            String subPage_link) {
        this.nums = nums;
        if (current_page == 0) {
            this.current_page = 1;
        } else {
            this.current_page = current_page;
        }
        this.sub_pages = sub_pages;
        this.page_array = new int[this.sub_pages];
        int nums2 = nums;
        int disNums2 = disNums;
        this.pageNums = (nums2 / disNums2);
        this.subPage_link = subPage_link;

    }

    /*
     * 用来给建立分页的数组初始化的函数。
     */
    public int[] initarray() {
        for (int i = 0; i < this.sub_pages; i++) {
            this.page_array[i] = i;
        }
        return this.page_array;
    }

    /*
     * construct_num_Page该函数使用来构造显示的条目 即使：[1][2][3][4][5][6][7][8][9][10]
     */
    public int[] construct_num_page() {
        int[] current_array;
        if (this.pageNums < this.sub_pages) {
            current_array = new int[this.pageNums];
            for (int i = 0; i < this.pageNums; i++) {
                current_array[i] = i + 1;
            }
        } else {
            current_array = this.initarray();

            if (this.current_page <= 3) {
                for (int i = 0; i < current_array.length; i++) {
                    current_array[i] = i + 1;
                }
            } else if (this.current_page <= this.pageNums
                    && this.current_page > this.pageNums - this.sub_pages + 1) {
                for (int i = 0; i < current_array.length; i++) {
                    current_array[i] = (this.pageNums) - (this.sub_pages) + 1
                            + i;
                }

            } else {
                for (int i = 0; i < current_array.length; i++) {
                    current_array[i] = this.current_page - 2 + i;

                }
            }

        }

        return current_array;
    }

    /*
     * 构造分页 当前第1/453页 [首页] [上页] 1 2 3 4 5 6 7 8 9 10 [下页] [尾页]
     */

    public String subPageCss() {
        String subPageCssStr = "";
        subPageCssStr += "当前第" + this.current_page + "/" + this.pageNums + "页 ";
        if (this.current_page > 1) {
            String firstPageUrl = this.subPage_link + "1";
            String prewPageUrl = this.subPage_link + (this.current_page - 1);
            subPageCssStr += "[<a href='" + firstPageUrl + "'>首页</a>] ";
            subPageCssStr += "[<a href='" + prewPageUrl + "'>上一页</a>] ";
        } else {
            subPageCssStr += "[首页] ";
            subPageCssStr += "[上一页] ";
        }

        int[] a = this.construct_num_page();

        for (int i = 0; i < a.length; i++) {
            int s = a[i];
            if (s == this.current_page) {
                subPageCssStr += "[<span style='color:red;font-weight:bold;'>"
                        + s + "</span>]";
            } else {
                String url = this.subPage_link + s;
                subPageCssStr += "[<a href='" + url + "'>" + s + "</a>]";

            }
        }

        if (this.current_page < this.pageNums) {
            String lastPageUrl = this.subPage_link + this.pageNums;
            String nextPageUrl = this.subPage_link + (this.current_page + 1);
            subPageCssStr += " [<a href='" + nextPageUrl + "'>下一页</a>] ";
            subPageCssStr += "[<a href='" + lastPageUrl + "'>尾页</a>] ";
        } else {
            subPageCssStr += "[下一页] ";
            subPageCssStr += "[尾页] ";
        }
        subPageCssStr += "  共" + this.nums + "条记录";

        return subPageCssStr;
    }

}

 调用页面：index.jsp

<%@ page language="java" import="java.util.*,pagination.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
        <title>My JSP 'index.jsp' starting page</title>
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">
    </head>

    <body>
    
        JAVA动态分页类调用<hr/>
        <%
        String p = request.getParameter("p") == null ? "1" : request.getParameter("p");//获取页码
        int pagenum = Integer.parseInt(p);//转为int类型
        int limit = 10;//显示条数
        int start = (pagenum - 1) * limit;//开始位置
        int nums = 400;//总条目数
        
        //输出测试
        for (int i = start; i < start + limit; i++) {
        out.print(i + 1 + ".................................................<br/>");
        }
            
        //调用分页类 new Cls_page(列表记录显示条数, 记录总条数, 当前被选中的页码, 页码链接数,每个分页的路径)
        Cls_page cls = new Cls_page(limit, nums, pagenum, 10,"index.jsp?p=");
        out.print(cls.subPageCss());
        %>
        
    </body>
</html>

运行结果：

JAVA动态分页类调用

---

31.................................................
32.................................................
33.................................................
34.................................................
35.................................................
36.................................................
37.................................................
38.................................................
39.................................................
40.................................................
当前第4/40页 [首页] [上一页] [2][3][4][5][6][7][8][9][10][11] [下一页] [尾页] 共400条记录