jsp+servlet+javabean实现数据分页方法完整实例

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE postgres[ <!ELEMENT postgres (driver,url,username,pwd)> <!ELEMENT driver (#PCDATA)> <!ELEMENT url (#PCDATA)> <!ELEMENT username (#PCDATA)> <!ELEMENT pwd (#PCDATA)>]><postgres> <driver>org.postgresql.Driver</driver> <url>jdbc:postgresql://localhost:5432/java</url> <username>admin</username> <pwd>k42jc</pwd></postgres>

package util;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;/**  * 用于解析xml属性文件  * @author JohsonMuler  *  */public class DOM4JUtil { private static Element root=null; static{//静态代码块  //创建解析对象  SAXReader sr=new SAXReader();  //获取当前工程路径//  String url=System.getProperty("user.dir");  String url=DOM4JUtil.class.getResource("").getPath();//  System.out.println(url);  try {   //通过文件路径获取配置文件信息   Document doc=sr.read(url+"config.xml");   //获取根节点   root=doc.getRootElement();  } catch (DocumentException e) {   e.printStackTrace();  } } public static String getPostgresData(String str){  //以根节点为基础，获取配置文件数据  Element e=root.element(str);  String data=e.getText();  return data; } public static void main(String[] args) {//  String url=DOM4JUtil.class.getResource("..").getPath();//  System.out.println(System.getProperty("user.dir"));//  System.out.println(url);  String driver=getPostgresData("driver");  String url=getPostgresData("url");  System.out.println(driver);  System.out.println(url); }}

package util;import java.sql.PreparedStatement;import java.sql.Statement;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;public class PostgreSQL_Util { private static DOM4JUtil dom=new DOM4JUtil(); private static Connection c=null; private static ResultSet rs=null; private static String driver=dom.getPostgresData("driver"); private static String url=dom.getPostgresData("url"); private static String username=dom.getPostgresData("username"); private static String pwd=dom.getPostgresData("pwd"); public PostgreSQL_Util(){  try {   Class.forName(driver);   c=DriverManager.getConnection(url);  } catch (ClassNotFoundException e) {   System.out.println("未找到指定类："+e.getMessage());  } catch (SQLException e) {   System.out.println("获取连接异常："+e.getMessage());  } } /**  * 数据查询方法(Statement)  * @param sql  * @return  * @throws SQLException  */ public ResultSet executeQuery(String sql) throws SQLException{  Statement s=c.createStatement();  rs=s.executeQuery(sql);  return rs; } /**  * 重载方法(PreparedStatement)  * @param sql  * @param list  * @return  * @throws SQLException  */ public ResultSet executeQuery(String sql,List<Object> list) throws SQLException{  PreparedStatement ps=c.prepareStatement(sql);  for(int i=0;i<list.size();i++){   System.out.println(list.get(i));   System.out.println(i+1);   ps.setObject(i+1, list.get(i));  }  rs=ps.executeQuery();  c.close();  return rs; } /**  * 数据更新方法(添加，删除，更改)(Statement)  * @param sql  * @throws SQLException  */ public int executeUpdate(String sql) throws SQLException{  Statement s=c.createStatement();  int i=s.executeUpdate(sql);  c.close();  return i; } /**  * 重载方法(PreparedStatement)  * @param sql  * @param list  * @throws SQLException  */ public int executeUpdate(String sql,List<Object> list) throws SQLException{  PreparedStatement ps=c.prepareStatement(sql);  for(int i=0;i<list.size();i++){   ps.setObject(i+1, list.get(i));  }  int i=ps.executeUpdate();  c.close();  return i; } /**  * 单独的获取连接  * @return  * @throws ClassNotFoundException  * @throws SQLException  */ public static Connection getConnection() throws ClassNotFoundException, SQLException{  Class.forName(driver);  c=DriverManager.getConnection(url);  return c; }}

package bean;import java.sql.ResultSet;public class PageProperties { private int currentPage;//当前页号 private int totalPages;//总页数 private int totalRecords;//总数据条数 private ResultSet rs;//动态结果集 public PageProperties() {  super(); } public PageProperties(int currentPage, int totalPages, int totalRecords,    ResultSet rs) {  super();  this.currentPage = currentPage;  this.totalPages = totalPages;  this.totalRecords = totalRecords;  this.rs = rs; } public int getCurrentPage() {  return currentPage; } public void setCurrentPage(int currentPage) {  this.currentPage = currentPage; } public int getTotalPages() {  return totalPages; } public void setTotalPages(int totalPages) {  this.totalPages = totalPages; } public int getTotalRecords() {  return totalRecords; } public void setTotalRecords(int totalRecords) {  this.totalRecords = totalRecords; } public ResultSet getRs() {  return rs; } public void setRs(ResultSet rs) {  this.rs = rs; }}

package bean;import java.sql.ResultSet;public class PageProperties { private int currentPage;//当前页号 private int totalPages;//总页数 private int totalRecords;//总数据条数 private ResultSet rs;//动态结果集 public PageProperties() {  super(); } public PageProperties(int currentPage, int totalPages, int totalRecords,    ResultSet rs) {  super();  this.currentPage = currentPage;  this.totalPages = totalPages;  this.totalRecords = totalRecords;  this.rs = rs; }  public int getCurrentPage() {  return currentPage; } public void setCurrentPage(int currentPage) {  this.currentPage = currentPage; } public int getTotalPages() {  return totalPages; } public void setTotalPages(int totalPages) {  this.totalPages = totalPages; } public int getTotalRecords() {  return totalRecords; } public void setTotalRecords(int totalRecords) {  this.totalRecords = totalRecords; } public ResultSet getRs() {  return rs; } public void setRs(ResultSet rs) {  this.rs = rs; }}

package servlet;import java.io.IOException;import java.io.PrintWriter;import java.sql.ResultSet;import java.sql.SQLException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import util.PostgreSQL_Util;import bean.PageProperties;import bean.TablePage;public class Page extends HttpServlet { public void service(HttpServletRequest request, HttpServletResponse response)   throws ServletException, IOException {  request.setCharacterEncoding("utf-8");  response.setContentType("text/html;charset=utf-8");  PrintWriter out = response.getWriter();  /**   * 通过TablePage设置分页属性   *   */  TablePage tb=new TablePage();  //获取当前表格显示的页码  int currentPage=tb.currentPage(tb.getStrPage(request, "page"));  System.out.println(currentPage);  //设置每页显示数据条数  tb.setPageRecord(10);//设置每页显示10条数据  /**   * 通过xxSQL_Util设置JDBC连接及数据处理   */  PostgreSQL_Util postgres=new PostgreSQL_Util();  try {   ResultSet rs_count=postgres.executeQuery("select count(*) as c from student");   rs_count.next();   //获得总的数据条数   int totalRecords=rs_count.getInt("c");   //根据数据表的总数据条数获取页面显示表格的总页数   int totalPages=tb.getTotalPages(totalRecords);   if(currentPage>totalPages){    currentPage=totalPages;//保证最后一页不超出范围   }   //根据数据库表信息和当前页面信息获得动态结果集   ResultSet rs=tb.getPageResultSet(postgres.executeQuery("select * from student"), currentPage);   /**     * 将数据加入javaBean    */   PageProperties pp=new PageProperties(currentPage, totalPages, totalRecords, rs);   /**     * 将javaBean转发至前端     */    request.setAttribute("result", pp);   request.getRequestDispatcher("tablePage.jsp").forward(request, response);  } catch (SQLException e) {   System.out.println("Class Page:"+e.getMessage());//   e.printStackTrace();  } }}

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@page import="java.sql.ResultSet"%><%@page import="bean.PageProperties"%><%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>简单数据分页</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <table>  <tr>   <td>姓名</td>   <td>性别</td>   <td>年龄</td>   <td>分数</td>  </tr>  <%   PageProperties pp=(PageProperties)request.getAttribute("result");    ResultSet rs=pp.getRs();  %>  <%   int i=1;   while(rs.next()){   %>  <tr>   <td><%=rs.getObject(1) %></td>   <td><%=rs.getObject(2) %></td>   <td><%=rs.getObject(3) %></td>   <td><%=rs.getObject(4) %></td>  </tr>  <%   i++;   if(i>10)    break;  }   %>   <br/>   <span><%=pp.getTotalPages() %>页</span>  <span>共<%=pp.getTotalRecords() %>条数据</span>  <span>本页<%=i-1 %>条</span>  <span>第<%=pp.getCurrentPage() %>页</span>  <p align="center">   <%    if ( pp.getCurrentPage() > 1 )    {   %><a href="<%=path %>/page?page=<%=pp.getCurrentPage() - 1%>"><<上一页</a>   <%    }   %>   <%    if ( pp.getCurrentPage() < pp.getTotalPages() )    {   %><a href="<%=path %>/page?page=<%=pp.getCurrentPage() + 1%>">下一页>></a>   <%    }   %>   <input type="text" name="input_text" id="input_text" size="1" />    <input type="button" name="skip" id="skip" value="跳转" onclick="skip();"/>   <script>    function skip(){     var v=document.getElementById("input_text").value;     location.href="page?page="+v;    }   </script>  </p> </table> </body></html>