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