分页查询示例
2013-09-20 17:04
134 查看
PageModel
UserManager
user_maint.jsp
/**
* 封装分页信息
*
* @author admin
*
*/
public class PageModel<E> {
// 结果集
private List<E> list;
// 查询记录数
private int totalRecords;
// 第几页
private int pageNo;
// 每页多少条数据
private int pageSize;
// 取得下一页
public int getNextPage() {
if (pageNo >= getBottomPage()) {
return getBottomPage();
}
return pageNo + 1;
}
// 取得上一页
public int getPreviousPage() {
if (pageNo <= 1) {
return 1;
}
return pageNo - 1;
}
// 取得尾页,尾页就是总页数
public int getBottomPage() {
return getTotalPages();
}
// 取得首页
public int getTopPageNo() {
return 1;
}
// 取得总页数
public int getTotalPages() {
return (totalRecords + pageSize - 1) / pageSize;
}
public List<E> getList() {
return list;
}
public void setList(List<E> list) {
this.list = list;
}
public int getTotalRecords() {
return totalRecords;
}
public void setTotalRecords(int totalRecords) {
this.totalRecords = totalRecords;
}
public int getPageNo() {
return pageNo;
}
public void setPageNo(int pageNo) {
this.pageNo = pageNo;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
}UserManager
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* 采用单例管理用户
*
* @author admin
*
*/
public class UserManager {
private static UserManager instance = new UserManager();
private UserManager() {
}
public static UserManager getInstance() {
return instance;
}
/**
* 分页查询
* @param pageNo 第几页
* @param pageSize 每页多少条数据
* @return pageModel
*/
public PageModel<User> findUserList(int pageNo,int pageSize) {
StringBuffer sb = new StringBuffer();
sb.append("select user_id,user_name,password,contact_tel,email,create_date ")
.append("from (")
.append("select rownum rn,user_id,user_name,password,contact_tel,email,create_date ")
.append("from (")
.append("select * from t_user where user_id<>'root' order by user_id")
.append(")where rownum<=?")
.append(")")
.append("where rn>?");
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
PageModel<User> pageModel = null;
try {
conn = DbUtil.getConnection();
pstmt = conn.prepareStatement(sb.toString());
pstmt.setInt(1, pageNo * pageSize);
pstmt.setInt(2, (pageNo - 1) * pageSize);
rs = pstmt.executeQuery();
List<User> userList = new ArrayList<User>();
while(rs.next()){
User user = new User();
user.setUserId(rs.getString("user_id"));
user.setUserName(rs.getString("user_name"));
user.setPassword(rs.getString("password"));
user.setContactTel(rs.getString("contact_tel"));
user.setEmail(rs.getString("email"));
user.setCreateDate(rs.getTimestamp("create_date"));
userList.add(user);
}
pageModel = new PageModel<User>();
pageModel.setList(userList);
pageModel.setTotalRecords(getTotalRecords(conn));
pageModel.setPageSize(pageSize);
pageModel.setPageNo(pageNo);
} catch (SQLException e) {
e.printStackTrace();
}finally{
DbUtil.close(rs);
DbUtil.close(pstmt);
DbUtil.close(conn);
}
return pageModel;
}
/**
* 取得总记录数
* @param conn
* @return
*/
private int getTotalRecords(Connection conn) {
String sql = "select count(*) from t_user where user_id<>'root'";
PreparedStatement pstmt = null;
ResultSet rs = null;
int count = 0;
try {
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
rs.next();
count = rs.getInt(1);//查询出来只有一个count
} catch (SQLException e) {
e.printStackTrace();
}
return count;
}
}user_maint.jsp
<!-- drp\WebRoot\sysmgr\user_maint.jsp -->
<%@ page language="java" import="java.util.*" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%>
<%@ page import="com.xdy.drp.sysmgr.domain.*" %>
<%@ page import="com.xdy.drp.sysmgr.manager.*" %>
<%@ page import="com.xdy.drp.util.*" %>
<%@ page import="java.text.*" %>
<%
int pageNo=3;
int pageSize=2;
//取得客户端传过来的需要跳转到的页数，赋值给pageNo，传入方法，返回pageModel在页面进行显示。
String pageNoString = request.getParameter("pageNo");
if(pageNoString!=null){
pageNo = Integer.parseInt(pageNoString);
}
PageModel<User> pageModel = UserManager.getInstance().findUserList(pageNo,pageSize);
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>用户维护</title>
<link rel="stylesheet" href="../style/drp.css">
<script type="text/javascript">
function addUser() {
window.self.location = "user_add.jsp";
}
function modifyUser() {
window.self.location = "user_modify.html";
}
/*
删除用户记录
*/
function deleteUser() {
}
/*
全选/全不选
*/
function checkAll(field) {
var selectFlags = document.getElementsByName("selectFlag");
for(var i=0;i<selectFlags.length;i++){
selectFlags[i].checked=field.checked;//上面的选中，下面的选中。上面的不选中，下面也跟着不选中。
}
}
//首页
function topPage() {
window.self.location="user_maint.jsp?pageNo=<%=pageModel.getTopPageNo()%>";//客户端把pageNo发送到服务端，服务端也是此页面。上面的JAVA代码就是服务端，需要接收参数pageNo。
}
//上一页
function previousPage() {
window.self.location="user_maint.jsp?pageNo=<%=pageModel.getPreviousPage()%>";
}
//下一页
function nextPage() {
window.self.location="user_maint.jsp?pageNo=<%=pageModel.getNextPage()%>";
}
//尾页
function bottomPage() {
window.self.location="user_maint.jsp?pageNo=<%=pageModel.getBottomPage()%>";
}
</script>
</head>
<body class="body1">
<form name="userform" id="userform">
<div align="center">
<table width="95%" border="0" cellspacing="0" cellpadding="0"
height="35">
<tr>
<td class="p1" height="18" nowrap>
</td>
</tr>
<tr>
<td width="522" class="p1" height="17" nowrap>
<img src="../images/mark_arrow_02.gif" width="14" height="14">
<b>系统管理>>用户维护</b>
</td>
</tr>
</table>
<hr width="100%" align="center" size=0>
</div>
<table width="95%" height="20" border="0" align="center"
cellspacing="0" class="rd1" id="toolbar">
<tr>
<td width="49%" class="rd19">
<font color="#FFFFFF">查询列表</font>
</td>
<td width="27%" nowrap class="rd16">
<div align="right"></div>
</td>
</tr>
</table>
<table width="95%" border="1" cellspacing="0" cellpadding="0"
align="center" class="table1">
<tr>
<td width="55" class="rd6">
<input type="checkbox" name="ifAll" onClick="checkAll(this)">
</td>
<td width="119" class="rd6">
用户代码
</td>
<td width="152" class="rd6">
用户名称
</td>
<td width="166" class="rd6">
联系电话
</td>
<td width="150" class="rd6">
email
</td>
<td width="153" class="rd6">
创建日期
</td>
</tr>
<%
List<User> userList = pageModel.getList();
for(Iterator<User> iter = userList.iterator();iter.hasNext();){
User user = iter.next();
%>
<tr>
<td class="rd8">
<input type="checkbox" name="selectFlag" class="checkbox1"
value="<%=user.getUserId() %>">
</td>
<td class="rd8">
<%=user.getUserId() %>
</td>
<td class="rd8">
<%=user.getUserName() %>
</td>
<td class="rd8">
<%=user.getContactTel() %>
</td>
<td class="rd8">
<%=user.getEmail() %>
</td>
<td class="rd8">
<%=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(user.getCreateDate()) %>
</td>
</tr>
<%
}
%>
</table>
<table width="95%" height="30" border="0" align="center"
cellpadding="0" cellspacing="0" class="rd1">
<tr>
<td nowrap class="rd19" height="2">
<div align="left">
<font color="#FFFFFF"> 共 <%=pageModel.getTotalPages() %> 页</font>
<font color="#FFFFFF">当前第</font>
<font color="#FF0000"><%=pageModel.getPageNo() %></font>
<font color="#FFFFFF">页</font>
</div>
</td>
<td nowrap class="rd19">
<div align="right">
<input name="btnTopPage" class="button1" type="button"
id="btnTopPage" value="|<< " title="首页"
onClick="topPage()">
<input name="btnPreviousPage" class="button1" type="button"
id="btnPreviousPage" value=" < " title="上页"
onClick="previousPage()">
<input name="btnNextPage" class="button1" type="button"
id="btnNextPage" value=" > " title="下页" onClick="nextPage()">
<input name="btnBottomPage" class="button1" type="button"
id="btnBottomPage" value=" >>|" title="尾页"
onClick="bottomPage()">
<input name="btnAdd" type="button" class="button1" id="btnAdd"
value="添加" onClick="addUser()">
<input name="btnDelete" class="button1" type="button"
id="btnDelete" value="删除" onClick="deleteUser()">
<input name="btnModify" class="button1" type="button"
id="b
d211
tnModify" value="修改" onClick="modifyUser()">
</div>
</td>
</tr>
</table>
<p>
</p>
</form>
</body>
</html>
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