jsp分页
分页工具类
package com.nanjing.page;
import javax.servlet.http.HttpServletRequest;
public class PageUtils {
//总共记录数
private int totalResult;
//总共页数
private int totalPage;
//当前页数
private int currentPage=1;
//每页显示的记录数
private int pageSize=2;
private HttpServletRequest request;
//当前页的第一条记录
private int fisrtIndex;
//当前页的最后一天记录
private int lastIndex;
public PageUtils() {
}
public void init(){
setTotalPage();
setCurrentPage();
if(request.getParameter("page")==null){
request.setAttribute("currentPage",1);
}else{
request.setAttribute("currentPage",request.getParameter("page"));
currentPage=Integer.parseInt(request.getParameter("page"));
}
setFisrtIndex();
setLastIndex();
request.setAttribute("totalPage", totalPage);
request.setAttribute("pageTargetURL", request.getRequestURL());
}
public int getTotalResult() {
return totalResult;
}
public void setTotalResult(int totalResult) {
this.totalResult = totalResult;
}
public int getTotalPage() {
return totalPage;
}
public void setTotalPage() {
if(totalResult<=pageSize){
totalResult=1;
}else{
if(totalResult%pageSize>0){
this.totalPage = totalResult/pageSize+1;
}else{
this.totalPage = totalResult/pageSize;
}
}
}
public int getCurrentPage() {
return currentPage;
}
public void setCurrentPage() {
if(request.getParameter("currentPage")==null){
currentPage=1;
}else{
this.currentPage = Integer.parseInt(request.getParameter("currentPage"));
}
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public HttpServletRequest getRequest() {
return request;
}
public void setRequest(HttpServletRequest request) {
this.request = request;
}
public int getFisrtIndex() {
return fisrtIndex;
}
public void setFisrtIndex() {
if(currentPage==1){
this.fisrtIndex=0;
}else{
this.fisrtIndex=(currentPage-1)*pageSize;
}
}
public int getLastIndex() {
return lastIndex;
}
public void setLastIndex() {
this.lastIndex = currentPage*pageSize;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
}
实体类
package com.nanjing.page;
public class User {
private int user_id;
private String username;
private String password;
private String sex;
public int getUser_id() {
return user_id;
}
public void setUser_id(int userId) {
user_id = userId;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
@Override
public String toString() {
return "User [password=" + password + ", sex=" + sex + ", user_id="
+ user_id + ", username=" + username + "]";
}
}
dao
package com.nanjing.page;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
public class Userdao {
private final String oracleRownum="SELECT a.* FROM (SELECT B.*, ROWNUM R FROM ( #sql WHERE ROWNUM <= #lastIndex) B ) a WHERE a.R > #firstIndex";
public Statement getStatement() throws ClassNotFoundException, SQLException{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:ORCL","alyssa","alyssa");
Statement statement=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
return statement;
}
public ResultSet doQueryCommon(PageUtils pageUtils,String sql) throws SQLException, ClassNotFoundException{
String pagesql=pageHandle(pageUtils,sql);
ResultSet rs=getStatement().executeQuery(pagesql);
return rs;
}
public ResultSet doQueryTotal(String sql) throws SQLException, ClassNotFoundException{
ResultSet rs=getStatement().executeQuery(sql);
return rs;
}
public String pageHandle(PageUtils pageUtils,String sql){
return oracleRownum.replaceAll("#sql", sql)
.replaceAll("#firstIndex", String.valueOf(pageUtils.getFisrtIndex()))
.replaceAll("#lastIndex", String.valueOf(pageUtils.getLastIndex()));
}
public List<User> queryUser(PageUtils pageUtils,String sql) throws SQLException, ClassNotFoundException{
ResultSet rs=doQueryCommon(pageUtils,sql);
List<User> userlist=new ArrayList<User>();
while(rs.next()){
int userId=rs.getInt("user_id");
String username=rs.getString("username");
String password=rs.getString("password");
String sex=rs.getString("sex");
User user=new User();
user.setUser_id(userId);
user.setPassword(password);
user.setUsername(username);
user.setSex(sex);
userlist.add(user);
}
return userlist;
}
public int queryTotalResult(String tablename) throws SQLException, ClassNotFoundException{
ResultSet rs=doQueryTotal("SELECT COUNT(*) c FROM "+tablename);
int count=0;
while(rs.next()){
count=rs.getInt("c");
}
return count;
}
}
逻辑处理类
package com.nanjing.page;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class UserServlet extends HttpServlet{
private Userdao userdao=new Userdao();
private List<User> userlist=new ArrayList<User>();
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
try {
int totalResult=userdao.queryTotalResult("my_user");
PageUtils pageUtils=new PageUtils();
pageUtils.setRequest(req);
pageUtils.setTotalResult(totalResult);
pageUtils.init();
userlist=userdao.queryUser(pageUtils,"select *from my_user");
req.setAttribute("userlist", userlist);
req.getRequestDispatcher("/user.jsp").forward(req, resp);
} catch (SQLException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}
分页页面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!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>Insert title here</title>
</head>
<body>
<script type="text/javascript">
function fowordPage(){
var num=/^[0-9]+$/;
var myPage=document.getElementById("myPage").value;
if(num.test(myPage) && 0<parseInt(myPage) && parseInt(myPage)<${totalPage}){
document.getElementById("myPage_a").href="${pageTargetURL}?page="+myPage;
}else{
alert("跳转页数输入不正确");
document.getElementById("myPage_a").href="javascript:void(0)";
}
}
</script>
<a href="${pageTargetURL}?page=1">首页</a>
<c:choose>
<c:when test="${currentPage<=1}">上一页</c:when>
<c:otherwise><a href="${pageTargetURL}?page=${currentPage-1}">上一页</a></c:otherwise>
</c:choose>
<c:choose>
<c:when test="${currentPage>=totalPage}">下一页</c:when>
<c:otherwise><a href="${pageTargetURL}?page=${currentPage+1}">下一页</a></c:otherwise>
</c:choose>
跳到第<input type="text" id="myPage">页
<a href="" onclick="fowordPage()" id="myPage_a">跳转</a>
<a href="${pageTargetURL}?page=${totalPage}">尾页</a>
当前第${currentPage}页，总共${totalPage}页
</body>
</html>
测试页面：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!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>Insert title here</title>
</head>
<body>
<table>
<tr>
<th>id</th>
<th>用户名</th>
<th>密码</th>
<th>性别</th>
</tr>
<c:forEach items="${userlist}" var="u">
<tr>
<td>${u.user_id}</td>
<td>${u.username}</td>
<td>${u.password}</td>
<td>${u.sex}</td>
</tr>
</c:forEach>
<tr>
<td colspan="4"><jsp:include page="page.jsp"></jsp:include></td>
</tr>
</table>
</body>
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>test</display-name>
<servlet>
<servlet-name>user</servlet-name>
<servlet-class>com.nanjing.page.UserServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>user</servlet-name>
<url-pattern>/userServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
脚本：
----------------------------------------------
-- Export file for user ALYSSA --
-- Created by alyssa on 2012/8/13, 20:46:24 --
----------------------------------------------
spool 11.log
prompt
prompt Creating table MY_USER
prompt ======================
prompt
create table ALYSSA.MY_USER
(
user_id INTEGER not null,
username VARCHAR2(100),
password VARCHAR2(100),
sex VARCHAR2(200)
)
tablespace ALYSSA_TEBLESPACE
pctfree 10
initrans 1
maxtrans 255
storage
(
initial 64K
next 1M
minextents 1
maxextents unlimited
);
comment on table ALYSSA.MY_USER
is '用户表';
comment on column ALYSSA.MY_USER.username
is '用户名';
spool off
http://localhost:8080/test/userServlet访问