jsp+oracle实现简单的分页

康5793

　　oracle脚本：drop table t_student cascade constraints;

/*==============================================================*/
/* Table: t_student                                           */
/*==============================================================*/
create table t_student  (
s_id              char(10)                        not null,
s_name             varchar2(20)                    not null,
s_age              char(2)                         not null,
s_sex              char(2)                         not null,
s_class            varchar2(20),
constraint PK_T_STUDENT primary key (s_id)
);
insert into t_student values('0001','张三','20','男','08级二班') ;
insert into t_student values('0002','李四','21','女','08级二班') ;
insert into t_student values('0003','王五','20','男','08级二班') ;
insert into t_student values('0004','赵柳','20','女','08级一班') ;
insert into t_student values('0005','杨梅','21','男','08级二班') ;
insert into t_student values('0006','刘海','23','女','08级一班') ;
insert into t_student values('0007','孙江','20','女','08级一班') ;
insert into t_student values('0008','苏灿','22','男','08级二班') ;
insert into t_student values('0009','王霞','23','女','08级一班') ;
insert into t_student values('0010','王猛','22','男','08级二班') ;
insert into t_student values('0011','张相','22','女','08级一班') ;
insert into t_student values('0012','香橙','20','女','08级一班') ;
insert into t_student values('0013','李心','21','女','08级二班') ;
insert into t_student values('0014','张强','20','男','08级一班') ;
insert into t_student values('0015','赵琳','21','女','08级一班') ;
insert into t_student values('0016','刘达','21','男','08级二班') ;
insert into t_student values('0017','苏惠','20','女','08级二班') ;
insert into t_student values('0018','贾瑞','20','女','08级一班') ;
insert into t_student values('0019','谷瑞坤','22','男','08级二班') ;
insert into t_student values('0020','祥还','21','男','08级一班') ;
commit;
　　采用单利模式创建DbUtil类获得Connection对象：package com.stmcc.test.util;

import java.sql.*;
public class DbUtil {
private static final String driver = "oracle.jdbc.driver.OracleDriver" ;
private static final String url = "jdbc:oracle:thin:@10.10.10.2:1521:orcl" ;
private static final String username = "test" ;
private static final String password = "test" ;
public static Connection getConnection(){
Connection conn = null ;
try{
Class.forName(driver) ;
conn = DriverManager.getConnection(url, username, password) ;
}catch(Exception e){
e.printStackTrace() ;
}
return conn ;
}
public static void close(Connection conn) {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public static void close(PreparedStatement pstmt) {
if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public static void close(ResultSet rs ) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
System.out.println(DbUtil.getConnection());
}
}

　　创建学生实体类：package com.stmcc.test;

public class Student {
private String s_id ;
private String s_name ;
private String s_age ;
private String s_sex ;
private String s_class ;
public String getS_id() {
return s_id;
}
public void setS_id(String s_id) {
this.s_id = s_id;
}
public String getS_name() {
return s_name;
}
public void setS_name(String s_name) {
this.s_name = s_name;
}
public String getS_age() {
return s_age;
}
public void setS_age(String s_age) {
this.s_age = s_age;
}
public String getS_sex() {
return s_sex;
}
public void setS_sex(String s_sex) {
this.s_sex = s_sex;
}
public String getS_class() {
return s_class;
}
public void setS_class(String s_class) {
this.s_class = s_class;
}
}

　　创建学生管理类：package com.stmcc.test.util;

import com.stmcc.test.*;
import java.sql.* ;
import java.util.*;
public class StuManager {
private static StuManager instance = new StuManager() ;
private StuManager(){} ;
public static StuManager getInstance(){
return instance ;
}
//  oracle实现分页的查询语句
//select s_id, s_name, s_age, s_sex, s_class
//from
//(
//  select rownum rn, s_id, s_name, s_age, s_sex, s_class
//  from
//    (select s_id, s_name, s_age, s_sex, s_class
//     from t_student order by s_id
//    )where rownum <= 10
//)where rn > 5 ;
public PageModel findStudentList(int pageNo, int pageSize){
PageModel pageModel = null ;
StringBuffer sql = new StringBuffer() ;
sql.append("select s_id, s_name, s_age, s_sex, s_class ")
.append("from")
.append("(")
.append("select rownum rn, s_id, s_name, s_age, s_sex, s_class ")
.append("from")
.append("(")
.append("select s_id, s_name, s_age, s_sex, s_class ")
.append("from t_student order by s_id")
.append(")")
.append("where rownum <= ?")
.append(")")
.append("where rn > ? ");
Connection conn = null ;
PreparedStatement pstmt = null ;
ResultSet rs = null ;
try{
conn = DbUtil.getConnection() ;
pstmt = conn.prepareStatement(sql.toString()) ;
pstmt.setInt(1, pageNo*pageSize) ;
pstmt.setInt(2, (pageNo - 1)*pageSize) ;
rs = pstmt.executeQuery() ;
List<Student> stuList = new ArrayList<Student>() ;
while (rs.next()){
Student stu = new Student() ;
stu.setS_id(rs.getString("s_id")) ;
stu.setS_name(rs.getString("s_name")) ;
stu.setS_age(rs.getString("s_age")) ;
stu.setS_sex(rs.getString("s_sex")) ;
stu.setS_class(rs.getString("s_class")) ;
stuList.add(stu) ;
}
pageModel = new PageModel() ;
pageModel.setList(stuList) ;
pageModel.setTotalRecords(getTotalRecords(conn)) ;
pageModel.setPageSize(pageSize);
pageModel.setPageNo(pageNo);
}catch(Exception 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)
throws SQLException {
String sql = "select count(*) from t_student";
PreparedStatement pstmt = null;
ResultSet rs = null;
int count = 0;
try {
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
rs.next();
count = rs.getInt(1);
}finally {
DbUtil.close(rs);
DbUtil.close(pstmt);
}
return count;
}
}
　　创建分页模型类实现业务逻辑：package com.stmcc.test.util;

import java.util.* ;
public class PageModel {
//结果集
private List list ;
//查询总记录数
private int totalRecords ;
//每页多少条数据
private int pageSize ;
//第几页
private int pageNo ;
/**
* 总页数
* @return
*/
public int getTotalPages(){
return (totalRecords + pageSize -1) / pageSize ;
}
/**
* 取得首页
* @return
*/
public int getTopPageNo(){
return 1 ;
}
/**
* 上一页
* @return
*/
public int getPreviousPageNo(){
if(pageNo <= 1){
return 1 ;
}
return pageNo - 1 ;
}
/**
* 下一页
* @return
*/
public int getNextPageNo(){
if(pageNo >= getBottomPageNo()){
return getBottomPageNo() ;
}
return pageNo + 1 ;
}
/**
* 取得尾页
* @return
*/
public int getBottomPageNo(){
return getTotalPages() ;
}
public List getList() {
return list;
}
public void setList(List list) {
this.list = list;
}
public int getTotalRecords() {
return totalRecords;
}
public void setTotalRecords(int totalRecords) {
this.totalRecords = totalRecords;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getPageNo() {
return pageNo;
}
public void setPageNo(int pageNo) {
this.pageNo = pageNo;
}
}

　　jsp页面：<%@ page contentType="text/html" pageEncoding="GBK"%>

<%@ page import="com.stmcc.test.util.*"%>
<%@ page import="com.stmcc.test.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="java.util.*"%>
<html>
<head><title>分页展示</title></head>
<%
int pageNo = 1 ;
int pageSize = 5 ;
String pageNoString = request.getParameter("pageNo") ;
if(pageNoString != null){
pageNo = Integer.parseInt(pageNoString) ;
}
PageModel pageModel = StuManager.getInstance().findStudentList(pageNo,pageSize) ;
%>
<script type="text/javaScript">
function topPage() {
window.self.location = "student.jsp?pageNo=<%=pageModel.getTopPageNo()%>";
}
function previousPage() {
window.self.location = "student.jsp?pageNo=<%=pageModel.getPreviousPageNo()%>";
}
function nextPage() {
window.self.location = "student.jsp?pageNo=<%=pageModel.getNextPageNo()%>";
}
function bottomPage() {
window.self.location = "student.jsp?pageNo=<%=pageModel.getBottomPageNo()%>";
}
</script>
<body>
<center>
<table border="1">
<tr>
<td>学生编号</td>
<td>学生姓名</td>
<td>学生年龄</td>
<td>学生性别</td>
<td>学生班级</td>
</tr>
<%
List stuList = pageModel.getList() ;
for(Iterator<Student> iter = stuList.iterator(); iter.hasNext();){
Student stu = iter.next() ;
%>
<tr>
<td><%=stu.getS_id() %></td>
<td><%=stu.getS_name() %></td>
<td><%=stu.getS_age() %></td>
<td><%=stu.getS_sex() %></td>
<td><%=stu.getS_class() %></td>
</tr>
<%
}
%>
<tr><td colspan="5">
共&nbsp;<%=pageModel.getTotalPages() %>&nbsp;页&nbsp;&nbsp;&nbsp;&nbsp;
当前第&nbsp;<%=pageModel.getPageNo() %>页&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<input type="button" value="首页" >
<input type="button" value="上一页" >
<input type="button" value="下一页" >
<input type="button" value="尾页" >
</td></tr>
</table>
</center>
</body>
</html>

halfh2o

不错，刚好可以学习一下。