booklist.jsp
<%@page import="books.accp.utils.Pager"%> <%@page import="books.accp.entities.Book"%> <%@page import="java.util.List"%> <%@page import="books.accp.bizImpl.BooksMangerImpl"%> <%@page import="books.accp.biz.BooksManager"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <% BooksManager manager = new BooksMangerImpl(); int pageindex = 1; if (request.getParameter("pageindex") != null) pageindex = Integer.parseInt(request.getParameter("pageindex")); Pager pager = new Pager(); pager.setTotalCount(manager.GetBookCount()); pager.setPageSize(3); pager.setPageIndex(pageindex); pager.getPageCount(); List<Book> list = manager.GetBookListByPage(pager); request.setAttribute("list", list); request.setAttribute("pager", pager); %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>书籍列表</title> </head> <body> <table> <tr> <th>编号</th> <th>书名</th> <th>价格</th> <th>图片</th> <th>库存</th> </tr> <c:forEach var="book" items="${list}"> <tr> <td>${book.bid }</td> <td><a href="bookinfo.aspx?bid=${book.bid}">${book.bookName }</a></td> <td>${book.b_price }</td> <td><img src="${image}" /></td> <td>${book.stock }</td> </tr> </c:forEach> </table> <%@ include file="../utils/pager.jsp"%> <%-- <jsp:include page="../utils/pager.jsp"></jsp:include> --%> </body> </html>
抽取出来的pager.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <style type="text/css"> .txtgo { width: 30px; border: 1px solid; } </style> <script type="text/javascript"> function goPage(pageindex) { document.getElementById("pageindex").value = pageindex; document.forms[0].submit(); } function jumpTo(){ var pageindex = document.getElementById("pageindex").value; var regexp=/^d+$/; if(!regexp.test(pageindex)){ alert("请输入正确的数字！"); return false; }else{ goPage(pageindex); } } </script> <form name="frmpage" method="post"> <div id="pager"> <c:if test="${pager.pageIndex > 1 }"> <a href="#" onclick="goPage(1)">首页</a> <a href="#" onclick="goPage(${ pager.pageIndex - 1 })">上一页</a> </c:if> <c:if test="${pager.pageIndex < pager.pageCount }"> <a href="#" onclick="goPage(${ pager.pageIndex + 1 })">下一页</a> <a href="#" onclick="goPage(${ pager.pageCount})">末页</a> </c:if> <input type="text" id="pageindex" name="pageindex" value="${param.pageindex == null ? 1 : param.pageindex}" class="txtgo" /> <input type="button" value="go" onclick="jumpTo()"> </div> </form>
公共分页类：pager.java
package books.accp.utils; public class Pager { //当前页 private int pageIndex = 1; //页大小 private int pageSize = 3; //总记录数 private int totalCount = 0; //总页数 private int pageCount = 0; public int getPageIndex() { return pageIndex; } public void setPageIndex(int pageIndex) { this.pageIndex = pageIndex; } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public int getTotalCount() { return totalCount; } public void setTotalCount(int totalCount) { this.totalCount = totalCount; } /** * 获取总页数 * * @return */ public int getPageCount() { pageCount = totalCount % pageSize == 0 ? totalCount / pageSize : totalCount / pageSize + 1; return pageCount; } /** * 获取开始记录数 * * @return */ public int getStartRow() { return (pageIndex - 1) * pageSize + 1; } /** * 获取结束记录数 * @return */ public int getEndRow() { return pageIndex * pageSize; } }
数据访问层：BookDaoImpl.java
package books.accp.daoImpl; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; import books.accp.dao.BaseDao; import books.accp.dao.BooksDao; import books.accp.entities.Book; import books.accp.utils.Pager; public class BooksDaoImpl extends BaseDao implements BooksDao { @Override public List<Book> GetBookList() { String sql = "select * from Books"; ResultSet rs = ExecuteQuery(sql, null); List<Book> list = GetResultSetToList(rs); return list; } @Override public int GetBookCount() { String sql = "select count(*) from Books"; Object obj = ExecuteScanlar(sql, null); int count = obj == null ? 0 : Integer.parseInt(obj.toString()); return count; } @Override public List<Book> GetBookListByPage(Pager pager) { String sql = "SELECT * FROM (SELECT Books.*,ROWNUM AS rn FROM Books) WHERE rn >= ? AND rn <= ?"; Object[] paras = new Object[2]; paras[0] = pager.getStartRow(); paras[1] = pager.getEndRow(); ResultSet rs = ExecuteQuery(sql, paras); List<Book> list = this.GetResultSetToList(rs); return list; } public List<Book> GetResultSetToList(ResultSet rs) { List<Book> list = new ArrayList<Book>(); try { while (rs.next()) { Book b = new Book(); b.setBid(rs.getInt("bid")); b.setBookName(rs.getString("bookname")); b.setB_price(rs.getDouble("B_price")); b.setImage(rs.getString("Image")); b.setStock(rs.getInt("Stock")); list.add(b); } return list; } catch (SQLException e) { e.printStackTrace(); } finally { CloseAll(rs); } return null; } }
数据访问接口：BooksDao.java
package books.accp.dao; import java.sql.ResultSet; import java.util.List; import books.accp.entities.Book; import books.accp.utils.Pager; public interface BooksDao{ public List<Book> GetBookList(); public int GetBookCount(); public List<Book> GetResultSetToList(ResultSet rs); public List<Book> GetBookListByPage(Pager pager); }
BaseDao.java
package books.accp.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import javax.naming.Context; import javax.naming.InitialContext; import javax.naming.NamingException; import javax.sql.DataSource; public class BaseDao { private static String jdbcname = "java:comp/env/jdbc/books"; private static Connection con; private static PreparedStatement stmt; /** * 关闭jdbc对象 * * @param rs */ public static void CloseAll(ResultSet rs) { // 关闭操作对象 if (rs != null) { try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } } if (stmt != null) { try { stmt.close(); } catch (SQLException e) { e.printStackTrace(); } } if (con != null) { try { con.close(); } catch (SQLException e) { e.printStackTrace(); } } } /** * 创建连接对象 * * @return */ private static Connection CreateConnection() { // 通过连接池创建Connection对象，一定是基于Tomcat的应用，连接池是由Tomcat进行管理 Context context; try { context = new InitialContext(); DataSource ds = (DataSource) context.lookup(jdbcname); con = ds.getConnection(); return con; } catch (NamingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } /** * 为PreparedStatement添加参数 * * @param stmt * @param paras */ private static void AddPararents(PreparedStatement stmt, Object[] paras) { try { if (paras != null && paras.length > 0) { for (int i = 0; i < paras.length; i++) { stmt.setObject(i + 1, paras[i]); } } } catch (SQLException e) { e.printStackTrace(); } } /** * 执行查询的方法 * 这里不能关闭ResultSet，因为是ResultSet是一个游标，必须保持数据库的打开状态 * @param 要执行的sql语句 * @param sql语句执行的参数 * @return */ public static ResultSet ExecuteQuery(String sql, Object[] paras) { ResultSet rs = null; try { con = CreateConnection(); stmt = con.prepareStatement(sql); AddPararents(stmt, paras); // 执行查询操作，返回ResultSet对象 rs = stmt.executeQuery(); return rs; } catch (SQLException e) { e.printStackTrace(); } return null; } /** * 返回首行首列 * * @param sql * @param paras * @return */ public static Object ExecuteScanlar(String sql, Object[] paras) { ResultSet rs = null; try { con = CreateConnection(); stmt = con.prepareStatement(sql); AddPararents(stmt, paras); // 执行查询操作，返回ResultSet对象 rs = stmt.executeQuery(); if (rs != null && rs.next()) { return rs.getObject(1); } } catch (SQLException e) { e.printStackTrace(); } finally { CloseAll(rs); } return null; } /** * 执行增加、修改、删除的方法 * * @param sql * @param paras * @return */ public static int ExecuteUpdate(String sql, Object[] paras) { try { con = CreateConnection(); stmt = con.prepareStatement(sql); AddPararents(stmt, paras); // 执行查询操作，返回ResultSet对象 int result = stmt.executeUpdate(); return result; } catch (SQLException e) { e.printStackTrace(); } finally { CloseAll(null); } return -1; } }
连接池：
<Resource name="jdbc/books" auth="Container" type="javax.sql.DataSource" maxActive="100" maxIdle="30" maxWait="10000" username="bookuser" password="bookuser" driverClassName="oracle.jdbc.driver.OracleDriver" url="jdbc:oracle:thin:localhost:1521:orcl" />
SQL表：
create table BOOKS ( BID NUMBER not null, BOOKNAME VARCHAR2(100) not null, B_PRICE VARCHAR2(10) not null, IMAGE VARCHAR2(200) not null, STOCK NUMBER not null ) ; alter table BOOKS add constraint PK_BOOKID primary key (BID); prompt Loading BOOKS... insert into BOOKS (BID, BOOKNAME, B_PRICE, IMAGE, STOCK) values (27, '泰戈尔诗集', '18.00', 'images/book/book_01.gif', 979); insert into BOOKS (BID, BOOKNAME, B_PRICE, IMAGE, STOCK) values (28, '痕记', '22.80', 'images/book/book_02.gif', 977); insert into BOOKS (BID, BOOKNAME, B_PRICE, IMAGE, STOCK) values (29, '天堂之旅', '25.00', 'images/book/book_03.gif', 989); insert into BOOKS (BID, BOOKNAME, B_PRICE, IMAGE, STOCK) values (30, '钱钟书集', '332.50', 'images/book/book_04.gif', 999); insert into BOOKS (BID, BOOKNAME, B_PRICE, IMAGE, STOCK) values (31, '赵俪生高昭—夫妻回忆录', '38.00', 'images/book/book_05.gif', 998); insert into BOOKS (BID, BOOKNAME, B_PRICE, IMAGE, STOCK) values (32, '无聊斋', '28.00', 'images/book/book_06.gif', 998); insert into BOOKS (BID, BOOKNAME, B_PRICE, IMAGE, STOCK) values (33, '一颗热土豆是一张温馨的床', '38.00', 'images/book/book_07.gif', 999); insert into BOOKS (BID, BOOKNAME, B_PRICE, IMAGE, STOCK) values (34, '李戡戡乱记', '22.00', 'images/book/book_08.gif', 999); insert into BOOKS (BID, BOOKNAME, B_PRICE, IMAGE, STOCK) values (35, '生生世世未了缘', '17.50', 'images/book/book_09.gif', 999); insert into BOOKS (BID, BOOKNAME, B_PRICE, IMAGE, STOCK) values (36, '一生有多少爱', '17.50', 'images/book/book_10.gif', 999);