針對分頁，首先開發一個 PageBean 用來控制頁面參數：

Java代碼??

package?com.longweir;??

??

//分頁后的javaBean??

??

import?java.sql.*;??

import?com.longweir.util.*;??

??

public?class?PageBean?{??

????private?int?pageSize=5;??//?每頁顯示的記錄數5個??

????private?int?currentPage=1;????//?當前頁碼??

????private?int?pageCount=1;??????//?總頁數??

????private?int?totalCount=0;?????//?總記錄數???

??

????//?計算總頁數??

????public?void?setPageCount()??

????{??

????????this.pageCount=(this.totalCount-1)/this.pageSize+1;??

????}??

??????

????//獲取總頁數??

????public?int?getPagecount()??

????{??

????????return?this.pageCount;??

????}??

??

??????

????//設置并修正當前頁碼,??

????public?void?setCurrentPage(int?currentpage)?{??

????????//校驗當前頁碼??

????????if?(currentPage>this.pageCount)??

????????????this.currentPage=this.pageCount;??

??????????

????????else?if?(currentPage<1)??

????????????this.currentPage=1;??

????????else???

????????????this.currentPage=currentpage;??

????}??

??????

????//獲取當前頁碼??

????public?int?getCurrentPage()?{??

????????return?this.currentPage;??

????}??

??????

????//獲取全部記錄數??

????public?int?getTotalCount()??

????{??

????????return?this.totalCount;??

????}??

??????

????//設置總共記錄數??

????public?void?setTotalCount(int?totalcount)??

????{??

????????this.totalCount?=totalcount;??

??????????

????????//設置總共記錄數后，同時需要校正計算總頁數??

????????this.pageCount=(this.totalCount-1)/this.pageSize+1;??

????}?????

??

????public?int?getPageSize()?{??

????????return?pageSize;??

????}??

??

????public?void?setPageSize(int?pageSize)?{??

????????this.pageSize?=?pageSize;??

??????????

????????//設置每頁顯示的記錄個數后?同時需要校正計算后的總頁數??

?????????this.pageCount=(this.totalCount-1)/this.pageSize+1;??

????}??

??????????

}??

?

?

okay,然后我們開發一個接口 SpiltPage，接口中共有兩個方法。

Java代碼??

package?com.longweir;??

??

//任何業務邏輯類只要實現了該接口?就可以進行數據的分頁顯示??

??

import?java.util.*;??

import?com.longweir.*;??

??

public?interface?SpiltPage?{???????

????//根據分頁對象中的參數?來分頁獲取數據??

????public?Collection?getPageData(PageBean?pagebean)?throws?Exception;???

??????

????//獲取所有的記錄個數??

????public?int?getAvailableCount()?throws?Exception;??

??

}??

?

?

這樣以來，主要的關于分頁的方法就完成了，我們開發一個針對數據庫表操作的業務邏輯類 ProductUtil，來實現上述接口

?下面這個類用來操作product表的數據，將分頁或所有數據：

Java代碼??

package?com.longweir;??

??

/*?

?*?此類包含所有的產品信息的操作業務邏輯?

?*?*/??

??

import?java.io.*;??

import?java.sql.*;??

import?java.util.*;??

import?com.longweir.SpiltPage;??

import?com.longweir.bean.ProductInfoVOBean;??

import?com.longweir.util.DatabaseConnection;??

??

public?class?ProductUtil?implements?SpiltPage?{??

????private?Connection?conn;??

??????

????//重寫無參構造方法來獲取數據庫連接??

????public?ProductUtil()??

????{??

????????this.conn=DatabaseConnection.getConnection();??//獲取數據庫連接對象??

????}??

??????

??????

?????????????//實現接口中的方法?來分頁獲取數據顯示??

????public?Collection?getPageData(PageBean?pagebean)?throws?Exception??

????{??

????????Statement?stmt=null;??

????????ResultSet?rs=null;??

????????Collection?ret=new?ArrayList();???????

????????if?(conn.isClosed())??conn=DatabaseConnection.getConnection();??

????????String?sqlstr="select?*?from?productInfo?order?by?productid?limit?"+(pagebean.getCurrentPage()-1)*pagebean.getPageSize()+","+pagebean.getPageSize();??

????????try??

????????{??

????????????stmt=conn.createStatement();??

????????????rs=stmt.executeQuery(sqlstr);??

????????????while?(rs.next())??

????????????{??

????????????????????ProductInfoVOBean?productInfo=new?ProductInfoVOBean();??

????????????????????productInfo.setCategoryid(rs.getString("catid"));??

????????????????????productInfo.setProductname(rs.getString("productName"));??

????????????????????productInfo.setProductid(rs.getString("productid"));??

????????????????????productInfo.setPublishment(rs.getString("publishment"));??

????????????????????productInfo.setPrice(rs.getFloat("price"));??

????????????????????productInfo.setDescription(rs.getString("descn"));??

????????????????????ret.add(productInfo);?????

????????????}?????

????????????stmt.close();??

????????????rs.close();??

????????????conn.close();??

????????}??

????????catch?(Exception?e)??

????????{??

????????????e.printStackTrace();??

????????}?????????????

????????return?ret;??

????}??

??????

????//實現接口方法?獲取記錄的總共個數??

??????

????public?int?getAvailableCount()??

????{??

????????Statement?stmt=null;??

????????ResultSet?rs=null;??

????????int?counter=0;????????

????????try{??

????????????if?(conn.isClosed())?conn=DatabaseConnection.getConnection();??

??????????????

????????????stmt=conn.createStatement();??

????????????rs=stmt.executeQuery("select?count(*)?from?productInfo");??

????????????while?(rs.next())??

????????????{??

????????????????counter=rs.getInt(1);??

????????????}??

????????????stmt.close();??

????????????rs.close();??

????????????conn.close();??

????????}??

????????catch?(Exception?e){}??

????????return?counter;???????

??????????

????}??

??????????

?

分頁的關鍵技術就是mysql中的這條分頁查詢語句：

"select * from productInfo order by productid limit "+(pagebean.getCurrentPage()-1)*pagebean.getPageSize()+","+pagebean.getPageSize();

?

開發一個viewProduct.jsp的頁面，來分頁顯示數據：

Html代碼??

<%@?page?contentType="text/html;charset=GBK"%>??

<%@?page?import="java.util.*"?%>??

<%@?page?import="java.io.*"?%>??

<%@?page?import="com.longweir.bean.*"?%>??

??

<jsp:useBean?id="product"?class="com.longweir.ProductUtil"?scope="session"?/>??

<jsp:useBean?id="pagebean"?class="com.longweir.PageBean"?scope="session"?/>??

??

<html>??

??<head>??

????<title>查看所有的產品的信息</title>??????

????<link?rel="stylesheet"?type="text/css"?href="css/style.css">??

??</head>??

????

??<body>??

??<h3?align="center">查看所有的產品信息</h3>???

??<table?width="960"?align="center"?border="0"?cellpadding="2"?cellspacing="1"?bgcolor="#999999">??

????<tr?bgcolor="#EFEEED">??

????????<td?width="100">商品編號</td>??

????????<td?width="100">類別</td>??

????????<td?width="200">名稱</td>??

????????<td?width="100">出版商</td>??

????????<td?width="80">售價</td>??

????????<td?width="200">描述</td>???

????????<td?colspan="2"?width="100"?align="center">管理</td>????????

????</tr>??

??<%???

????String?temppage=request.getParameter("page");??

????int?pno=1;??

??????

????if?(temppage!=null?&&?!("").equals(temppage))??

????{??

????????try??

????????{??

???????????pno=Integer.parseInt(temppage);??//獲取提交的頁面編號??

????????}??

????????catch?(Exception?e)??

????????{???

???????????pno=1;???//有異常?則直接跳轉到首條??

????????}??

????}????

???//每次刷新頁面時都應當重新獲得表中的記錄數,因為翻頁過程中表的記錄可能隨時都會更新???

?????pagebean.setTotalCount(product.getAvailableCount());???????

?????pagebean.setCurrentPage(pno);??

??%>??

??????

??<%???

?????Collection?productproducts=product.getPageData(pagebean);??//分頁顯示??

?????Iterator?it=products.iterator();??

?????while?(it.hasNext())??

?????{??

?????????ProductInfoVOBean?temp=(ProductInfoVOBean)it.next();??

?????????out.println("<tr??bgcolor=\"#FFFFFF\">");??

?????????out.println("<td>"+temp.getProductid()+"</td>");??

?????????out.println("<td>"+temp.getCategoryid()+"</td>");??

?????????out.println("<td>"+temp.getProductname()+"</td>");??

?????????out.println("<td>"+temp.getPublishment()+"</td>");??

?????????out.println("<td>"+temp.getPrice()+"</td>");??

?????????out.println("<td>"+temp.getDescription()+"</td>");??

?????????out.println("<td?algin=\"center\">"+"<a?href=#>修改</a>"+"</td>");??

?????????out.println("<td?align=\"center\">"+"<a?href=\"/product/servlet/DeleteProductServlet?productid="+temp.getProductid()+"\">刪除</a</td>");??

?????????out.println("</tr>");???????????

?????}???

??%>??

??</table>??

????

??<table?width="960"?align="center"?border="0"?cellpadding="1"?cellspacing="2">??

????<tr>??

????????<td></td>??

????<tr>??

????<tr>??

??????<td?align="right">??

????????共<%=pagebean.getPagecount()%>頁??

????????<%??

???????????for?(int?i=1;i<=pagebean.getPagecount();i++)??

???????????????out.println("<a?href=/product/viewProduct.jsp?page="+i+">"+i+"</a>");??

????????%>??????

??????</td>??

??</tr>??

??</table>??

??</body>??

</html>??

?

?

jsp中有很多java代碼，可以考慮使用標簽代替現實 呵呵。

?

分頁的效果如下啦：

?

總結

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