在工作目錄下META-INF中創建一個context.xml,其代碼如下：
<Context>
<Resource
name="jdbc/zihan" //隨便自己的命名
type="javax.sql.DataSource"
password="yd"
driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver"
maxIdle="2"
maxWait="5000"
username="sa"
url="jdbc:microsoft:sqlserver://localhost;DatabaseName=news"
maxActive="10"/>
</Context>
在這裏配置移植性強。
二、
然後創建JDBC.java文件，其代碼如下：
package com.mwq.database;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
/**
* @author mwq
*
*/
public class JDBC {
protected Connection conn;
protected Statement stmt;
protected PreparedStatement prpdStmt;
protected CallableStatement cablStmt;
protected ResultSet rs;
static DataSource ds;
static {
try {
Context initCtx=new InitialContext();
ds=(DataSource)initCtx.lookup("java:comp/env/jdbc/zihan");
} catch (NamingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public boolean openConn(boolean autoCommit) {
boolean isOpen = true;
try {
conn = ds.getConnection();
if (!autoCommit)
conn.setAutoCommit(false);
} catch (SQLException e) {
isOpen = false;
System.out.println("------ 在創建數據庫連接時拋出異常，內容如下：");
e.printStackTrace();
}
return isOpen;
}
public boolean closeConn() {
boolean isCommit = true;
try {
conn.commit();
} catch (SQLException e) {
isCommit = false;
System.out.println("------ 在提交數據庫事務時拋出異常，內容如下：");
e.printStackTrace();
try {
conn.rollback();
} catch (SQLException e1) {
System.out.println("------ 在回滾數據庫事務時拋出異常，內容如下：");
e1.printStackTrace();
}
} finally {
try {
conn.close();
} catch (SQLException e) {
System.out.println("------ 在關閉數據庫連接時拋出異常，內容如下：");
e.printStackTrace();
}
}
return isCommit;
}
}
三、創建存放數據的OperateTb.java文件
package com.mwq.database;
import java.util.ArrayList;
import java.util.List;
public class OperateTb extends JDBC {
public List<Object[]> selectBySQL(String sql) {
List<Object[]> notes = new ArrayList<Object[]>();
this.openConn(true);
try {
this.stmt = conn.createStatement();
this.rs = this.stmt.executeQuery(sql); // 通過父類的屬性操作數據庫
int l = rs.getMetaData().getColumnCount(); // 獲得數據表的列數
while (rs.next()) { // 通過循環將記錄保存到List中
Object[] note = new Object[l];
for (int i = 0; i < l; i++) {
note[i] = rs.getObject(i + 1);
}
notes.add(note);
}
this.rs.close();
this.stmt.close();
} catch (Exception e) {
System.out.println("------ 在檢索記錄時拋出異常，內容如下：");
e.printStackTrace();
}
this.closeConn(); // 調用父類的關閉數據庫連接的方法
return notes;
}
}
分頁的Pagination.java文件
package com.mwq.tool;
import java.util.ArrayList;
import java.util.List;
/**
* @作者紫寒11202010-05-23
*/
public class Pagination {
private int currentPage; // 當前頁
private int totalPages; // 總頁數
private int pageRows; // 每頁記錄數
private int totalRows; // 總記錄數
private int pageStartRow; // 每頁開始記錄
private int pageEndRow; // 每頁結束記錄
private boolean hasPreviousPage;// 是否有上一頁
private boolean hasNextPage; // 是否有下一頁
private List<Object[]> totalList; // 要分頁的數據
public Pagination() {
}
// 初始化分頁信息
public void initPageBean(List<Object[]> totalList, int pageRows) {
this.totalList = totalList;
this.pageRows = pageRows;
this.totalRows = totalList.size();
this.currentPage = 1;
// 計算總頁數
if ((totalRows % pageRows) == 0) {
totalPages = totalRows / pageRows;
if (this.totalRows == 0)
this.totalPages = 1;
} else {
totalPages = totalRows / pageRows + 1;
}
// 默認無上一頁
this.hasPreviousPage = false;
// 判斷是否有下一頁
if (currentPage == totalPages) {
hasNextPage = false;
} else {
hasNextPage = true;
}
// 默認第一頁開始的記錄數爲1
this.pageStartRow = 1;
// 確定第一頁結束的記錄數
if (totalRows < pageRows) {
this.pageEndRow = totalRows;
} else {
this.pageEndRow = pageRows;
}
}
// 獲得當前頁信息
public List<Object[]> getCurrentPageList() {
if (currentPage * pageRows < totalRows) {
pageEndRow = currentPage * pageRows;
pageStartRow = pageEndRow - pageRows;
} else {
pageEndRow = totalRows;
pageStartRow = pageRows * (totalPages - 1);
}
List<Object[]> pageList = new ArrayList<Object[]>(pageEndRow
- pageStartRow + 1);
if (totalRows != 0) {
for (int i = pageStartRow; i < pageEndRow; i++) {
pageList.add(totalList.get(i));
}
}
return pageList;
}
// 獲得上一頁信息
public List<Object[]> getPreviousPageList() {
currentPage = currentPage - 1;
if (currentPage < 1)
currentPage = 1;
if (currentPage >= totalPages) {
hasNextPage = false;
} else {
hasNextPage = true;
}
if ((currentPage - 1) > 0) {
hasPreviousPage = true;
} else {
hasPreviousPage = false;
}
List<Object[]> pageList = this.getCurrentPageList();
return pageList;
}
// 獲得下一頁信息
public List<Object[]> getNextPageList() {
currentPage = currentPage + 1;
if (currentPage > totalPages)
currentPage = totalPages;
if ((currentPage - 1) > 0) {
hasPreviousPage = true;
} else {
hasPreviousPage = false;
}
if (currentPage >= totalPages) {
hasNextPage = false;
} else {
hasNextPage = true;
}
List<Object[]> pageList = this.getCurrentPageList();
return pageList;
}
// 獲得指定頁信息
public List<Object[]> getAppointPageList(int currentPage) {
this.currentPage = currentPage;
if (currentPage > this.totalPages)
this.currentPage = this.totalPages;
if (currentPage < 1)
this.currentPage = 1;
if (this.currentPage > 1) {
this.hasPreviousPage = true;
} else {
this.hasPreviousPage = false;
}
if (this.currentPage < this.totalPages) {
this.hasNextPage = true;
} else {
this.hasNextPage = false;
}
List<Object[]> pageList = this.getCurrentPageList();
return pageList;
}
// 返回當前頁
public int getCurrentPage() {
return currentPage;
}
// 返回每頁記錄數
public int getPageRows() {
return pageRows;
}
// 返回當前頁開始記錄
public int getPageStartRow() {
return pageStartRow;
}
// 返回當前頁結束記錄
public int getPageEndRow() {
return pageEndRow;
}
// 返回總頁數
public int getTotalPages() {
return totalPages;
}
// 返回總記錄數
public int getTotalRows() {
return totalRows;
}
// 返回是否有上一頁
public boolean isHasPreviousPage() {
return hasPreviousPage;
}
// 返回是否有下一頁
public boolean isHasNextPage() {
return hasNextPage;
}
}
實現分頁的index.jsp文件
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<jsp:useBean id="optb" class="com.mwq.database.OperateTb" scope="page"/>
<jsp:useBean id="pagination" class="com.mwq.tool.Pagination" scope="session"/>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>利用數據分頁Bean對ResultSet結果集進行分頁</title>
</head>
<link rel="stylesheet" href="css/style.css">
<script language="javascript" type="">
<!--
function checkPage(formName){
if (formName.requestPage.value==""){
alert("請填寫欲跳轉頁碼！");
formName.requestPage.focus();
return false;
}
if (isNaN(formName.requestPage.value)){
alert("欲跳轉頁碼必須爲數值！");
formName.requestPage.value="";
formName.requestPage.focus();
return false;
}
}
//-->
</script>
<body topmargin="0">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="11%"></td>
<td width="78%"></td>
<td width="11%"></td>
</tr>
<tr>
<td> </td>
<td bgcolor="#CCFFFF"><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td> </td>
</tr>
<tr>
<td align="center"><font size="2"><b>利用數據分頁Bean對ResultSet結果集進行分頁</b></font></td>
</tr>
<tr>
<td> </td>
</tr>
<%
List<Object[]> pageList=null;
if(request.getParameter("requestPage")==null){
List<Object[]> totalList=optb.selectBySQL("select * from news");
pagination.initPageBean(totalList,5);
pageList=pagination.getCurrentPageList();
}else{
String requestPage=request.getParameter("requestPage");
if(requestPage.equals("previousPage")){
pageList=pagination.getPreviousPageList();
}elseif(requestPage.equals("nextPage")){
pageList=pagination.getNextPageList();
}
else{
int appointPage=Integer.valueOf(requestPage);
pageList=pagination.getAppointPageList(appointPage);
}
}
%>
<tr>
<td align="center"><table width="80%" border="1" cellspacing="0" cellpadding="4">
<tr align="center" bgcolor="yellow">
<td>NewsID</td>
<td>Title</td>
<td>body</td>
<td>hits</td>
<td>shijain</td>
<td>學歷</td>
<td>籍貫</td>
</tr>
<%
for(int m=0;m<pageList.size();m++){
if((m+1)%2==0)
out.println("<tr align=center bgcolor=#E6E6E6 >");
else
out.println("<tr align=center bgcolor=white>");
%>
<%
Object[] note=pageList.get(m);
out.println("<td>"+note[0]+"</td>");
out.println("<td>"+note[1]+"</td>");
out.println("<td>"+note[2]+"</td>");
out.println("<td>"+note[3]+"</td>");
out.println("<td>"+note[4]+"</td>");
out.println("<td>"+note[5]+"</td>");
out.println("<td align='left'>"+note[6]+"</td>");
%>
</tr>
<%
}
%>
</table>
<form action="index.jsp" method="post" name="page" onsubmit="return checkPage(page)">
<tralign="right">
<td>共有<font color="red" size="1"> <%=pagination.getTotalRows() %> </font>條記錄，
當前是第<font color="red" size="1"> <%=pagination.getCurrentPage()+"/"+pagination.getTotalPages() %> </font>頁
<a href="index.jsp">首頁</a>
<%if(pagination.isHasPreviousPage())out.print("<a href='index.jsp?requestPage=previousPage'>上一頁</a> "); %>
<%if(pagination.isHasNextPage())out.print(" <a href='index.jsp?requestPage=nextPage'>下一頁</a> "); %>
第<input type="text" name="requestPage" size="3" maxlength="2">頁
<input type="submit" value="轉到>>"> </td>
</tr>
</form>
</td>
</tr>
<tr>
<td> </td>
</tr>
</table></td>
<td> </td>
</tr>
</table>
</body>
</html>