<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%@ page import="java.sql.*" %>
<%@ page import="org.zshwd.vo.User" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%
int allCount = 0; //共多少条记录
int pageSize = 2; //每页多少条
int pageCount = 1; //共分多少页
int currentPage = 1; //当前页
%>
<%
try{
//当前页 采用地址栏传值方式
currentPage = Integer.valueOf(request.getParameter("page"));
}
catch(Exception e){
//e.printStackTrace();
}
//out.println(currentPage);
%>
<%!
private static final String DBDRIVER = "oracle.jdbc.OracleDriver";
private static final String DBURL = "jdbc:oracle:thin:@localhost:1521:orcl";
private static final String DBUSER = "scott";
private static final String DBPASSWORD = "tiger";
private Connection conn = null;
%>
<%
try{
Class.forName(DBDRIVER);
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASSWORD);
}
catch (Exception e) {
e.printStackTrace();
}
%>
<%
//count 数量
String strSQL = "Select Count(*) As Num From Users";
PreparedStatement pstmt;
pstmt = conn.prepareStatement(strSQL);
ResultSet rs = pstmt.executeQuery();
if(rs.next()){
allCount = rs.getInt(1);
}
%>
<%
int tempNum = 0;
//取余数
tempNum = allCount % pageSize;
//有余数
if(tempNum > 0){
pageCount = allCount / pageSize + 1;
}
else{
pageCount = allCount / pageSize;
}
%>
<%
//当前页
if(currentPage <=0 ){
currentPage = 1;
}
//大于总页数
if(currentPage > pageCount){
currentPage = pageCount;
}
%>
<%
/* strSQL = "Select UserId,UserName From Users limit " + (currentPage - 1) * pageSize + "," + pageSize; */
strSQL = "select UserId,UserName from ( select t.*,rownum from Users t) where rownum>"+(currentPage-1)*pageSize+" and rownum<="+(currentPage)*pageSize;
/* strSQL = "select UserId,UserName from ( select t.*,rownum from Users t) where rownum>0 and rownum<=2"; */
List<User> listUser = new ArrayList<User>();
// 准备sql
pstmt = conn.prepareStatement(strSQL);
rs = pstmt.executeQuery();
try {
while (rs.next()) {
User user = new User();
user.setUserId(rs.getInt(1));
user.setUserName(rs.getString(2));
listUser.add(user);
}
} catch (Exception e) {
e.printStackTrace();
}
%>
<table>
<tr>
<td>主键Id</td>
<td>用户名</td>
<td>操作</td>
</tr>
<%
Iterator iter = listUser.iterator();
while(iter.hasNext())
{
User user = (User)iter.next();
%>
<tr>
<td><%=user.getUserId() %></td>
<td><%=user.getUserName() %></td>
<td>修改 删除</td>
</tr>
<%
}
%>
</table>
<table>
<tr><td align="center">共<font color="#f00"><%=allCount%></font>条
每页<font color="#f00"><%=pageSize%></font>条
分<font color="#f00"><%=pageCount%></font>页
当前<font color="#f00"><%=currentPage%></font>页
<%
//当前页大于1
if(currentPage > 1){
%>
<a href="?page=1">首页</a> <a href="?page=<%=currentPage-1%>">上一页</a>
<%
}
else{
%>
首页 上一页
<%
}
%>
<%//***************************** %>
<%
//当前页小于共分多少页
if(currentPage < pageCount){
%>
<a href="?page=<%=currentPage+1%>" >下一页 </a> <a href="?page=<%=pageCount%>">尾页</a>
<%
}
else{
%>
下一页 尾页
<%
}
%>
<input type="text" name="txtCurrentPage" id="txtCurrentPage" size="3" value="<%=currentPage%>">
<input type="button" value="GO" onclick="Jump()" /></td></tr>
<script language="javascript" type="text/javascript">
function Jump(){
//通过Id查找表单 值 为空
if(document.getElementById("txtCurrentPage").value == ""){
//弹出对话框
alert("请输入数字");
//获得焦点
document.getElementById("txtCurrentPage").focus();
return false;
}
//只能输入正整数 不大于 最大页数
//判断输入是否是数字
var pattern=/^[0-9]*[1-9][0-9]*$/;
var currentPage;
currentPage = document.getElementById("txtCurrentPage").value;
//用正则表达式 验证 输入的值 false
if(!pattern.test(currentPage)){
alert("请输入正整数");
document.getElementById("txtCurrentPage").focus();
return false;
}
if(currentPage > <%=pageCount%>){
alert("请输入1到" + <%=pageCount%> + "之间的正整数");
document.getElementById("txtCurrentPage").focus();
return false;
}
location.href="?page=" + document.getElementById("txtCurrentPage").value;
}
</script>
</table>
<%
conn.close();
%>
