jsp+servlet前后台分页代码示例的主要代码（2012）

 

Main.java:

package org.jsoft.servlet;

import java.io.IOException;
import java.io.PrintWriter;
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;

import org.jsoft.topic.Topic;
import org.jsoft.topic.TopicOP;

public class Main extends HttpServlet {
	
	int pageSize = 24;//每页显示记录数
	int startRow = 0; //开始显示记录的编号 
	int pageNo=0;//需要显示的页数
	int counterStart=0;//每页页码的初始值	//每页页码记录的初始值
	int counterEnd=0;//显示页码的最大值		//每页页面记录的最大值
	int recordCount=0;//总记录数;
	int maxPage=0;//总页数
	int prevStart=0;//前一页
	int nextPage=0;//下一页
	int lastRec=0; 									//最后一页记录的标记
	int lastStartRecord=0;//最后一页开始显示记录的编号


	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		//获取需要显示的页数，由用户提交
		if(request.getParameter("pageNo")==null){ //如果为空，则表示第1页
		if(startRow == 0){
		   pageNo = startRow + 1; //设定为1

		}
		}else{
		pageNo = Integer.parseInt(request.getParameter("pageNo")); //获得用户提交的页数
		startRow = (pageNo - 1) * pageSize; //获得开始显示的记录编号
		}

		//因为显示页码的数量是动态变化的，假如总共有一百页，则不可能同时显示100个链接。而是根据当前的页数显示
		//一定数量的页面链接		
		
		//设置显示页码的初始值!!
		if(pageNo % pageSize == 0){
			counterStart = pageNo - (pageSize - 1);
		}else{
			counterStart = pageNo - (pageNo % pageSize) + 1;
		}
	  
		counterEnd = counterStart + (pageSize - 1);	
		
		TopicOP topicOP=new TopicOP();
		//获取总记录数
		recordCount=topicOP.queryCountRecord();
		
		List<Topic> list=topicOP.queryPageAll(startRow, pageSize);
		request.getSession().setAttribute("list",list);
		

		//获取总页数
		if(recordCount % pageSize == 0){
		  maxPage = recordCount / pageSize;
		}else{
		   maxPage = recordCount/pageSize+1;
		}
				

		request.setAttribute("pageNo",pageNo);
		request.setAttribute("startRow",startRow);
		request.setAttribute("pageSize",pageSize);
		request.setAttribute("counterStart",counterStart);
		request.setAttribute("counterEnd",counterEnd);
		request.setAttribute("recordCount",recordCount);
		request.setAttribute("maxPage",maxPage);
		
	   String loginusername=(String)request.getSession().getAttribute("username");
	   request.getSession().setAttribute("loginusername", loginusername);	
	   String[] userInformation=topicOP.queryUserInformation(loginusername);
	   request.setAttribute("userInformation", userInformation);
	   request.getRequestDispatcher("main.jsp").forward(request,response);
	}
	public void doGet(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException {
		
		this.doPost(request, response);
		
	}


}

 

TopicOP.java:

package org.jsoft.topic;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import org.jsoft.util.MyConnection;

public class TopicOP
{
	Connection conn = null;
	Statement st = null;
	ResultSet rs = null;



	public List<Topic> queryALL()
	{
		List<Topic> list = new ArrayList<Topic>();

		try
		{
			conn = MyConnection.getConnection();
			st = conn.createStatement();		
			String sql="select" +" ttopic,tclickcount,ttime,username ,tid "+" FROM bbsuser b ,(select tid,userid,ttopic,ttime ,tclickcount "+"FROM bbstopic group by tid ) a "+"WHERE a.userid=b.userid";			
			rs = st.executeQuery(sql);
			while (rs.next())
			{
				Topic topic = new Topic();
				topic.setTclickcount(rs.getInt(2));
				topic.setTid(rs.getInt(5));
				topic.setTtopic(rs.getString(1));
				topic.setUsername(rs.getString(4));
				topic.setTtime(rs.getDate(3));
				list.add(topic);			
			}
		} catch (Exception e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally
		{
			MyConnection.close(rs, st, conn);
		}

		return list;
	}
	
	
	//查询要显示的页面的所有记录。limit条件。返回一个List。
	public List queryPageAll(int startRow,int pageSize){
		
		List<Topic> list = new ArrayList<Topic>();	
		try {
						
			conn = MyConnection.getConnection();		
			st = conn.createStatement();	

	
			rs = st.executeQuery("select" +" ttopic,tclickcount,ttime,username ,tid "+" FROM bbsuser b ,(select tid,userid,ttopic,ttime ,tclickcount "+"FROM bbstopic group by tid ) a "+"WHERE a.userid=b.userid ORDER BY a.tid ASC LIMIT "
				       +startRow+", "+pageSize);
			while (rs.next())
			{
				Topic topic = new Topic();
				topic.setTclickcount(rs.getInt(2));
				topic.setTid(rs.getInt(5));
				topic.setTtopic(rs.getString(1));
				topic.setUsername(rs.getString(4));
				topic.setTtime(rs.getDate(3));
				list.add(topic);			
		
			}
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			
			MyConnection.close(rs, st, conn);
		}
	
		return list;
	}
	
	

	public Topic queryByID(int id)
	{

		Topic topic = new Topic();

		topic.setTid(id);
		try
		{
			conn = MyConnection.getConnection();
			st = conn.createStatement();
			String sql = "SELECT tcontents,ttime,ttopic,username FROM bbstopic  a,bbsuser  b WHERE a.userid=b.userid and tid= "
					+ id;
			rs = st.executeQuery(sql);
			if (rs.next())
			{
				topic.setTtime(rs.getDate("ttime"));
				topic.setTcontents(rs.getString("tcontents"));
				topic.setTtopic(rs.getString("ttopic"));
				topic.setUsername(rs.getString("username"));

			}

		} catch (Exception e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return topic;
	}
	
	public int addTopic(int userid,String ttopic,String tcontents,String ttime)
	{
		int tag = 0;
		try
		{
			conn = MyConnection.getConnection();
			
			st = conn.createStatement();
			String sql = "INSERT INTO bbstopic(userid,ttopic,tcontents,ttime) VALUES("+userid+",'"+ttopic+"','"+tcontents+"','"+ttime+"')";
			
			tag = st.executeUpdate(sql);
			
		} catch (Exception e)
		{
			e.printStackTrace();
		}
		
		
		
		return tag;
	}
	
	
	
public String[] queryUserInformation(String username){

		Connection conn = null;
		Statement st = null;
		ResultSet rs = null;
		String[] str = new String[2];
		try
		{
			conn = MyConnection.getConnection();
			st = conn.createStatement();
			String sql = "SELECT email FROM bbsuser WHERE username='"+username+"'";
			rs = st.executeQuery(sql);
			while(rs.next()){
				str[1] = rs.getString("email");	

				
			}
	
		} catch (Exception e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally
		{
			MyConnection.close(rs, st, conn);
		}
		str[0]=username;
		return str;
		
		
	}


	//获取总记录数
	public int queryCountRecord(){
		Connection conn = null;
		Statement st = null;
		ResultSet rs = null;
		
		int recordCount = 0;
		
		try {
			conn = MyConnection.getConnection();
			st = conn.createStatement();
			rs = st.executeQuery("select count(*) from bbstopic") ;	
			rs.next();			
			recordCount = rs.getInt(1);
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace(); 
		} 
		return recordCount;		
	}

//public static void main(String[] args) {
//	TopicOP op=new TopicOP();
////	op.queryByID(3);
//	op.queryCountRecord();
//	
//}
	
}

 

 

 

jdbc.properties

url=jdbc:mysql:///bbs
username=root
password=root
driverclass=com.mysql.jdbc.Driver

 

main.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core"  prefix="c"%>
<%@ page import="org.jsoft.topic.TopicOP" %>
<%
request.setCharacterEncoding("utf-8");
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<%
int pageNo=(Integer)request.getAttribute("pageNo");
int startRow=(Integer)request.getAttribute("startRow");
int pageSize=(Integer)request.getAttribute("pageSize");
int counterStart=(Integer)request.getAttribute("counterStart");
int counterEnd=(Integer)request.getAttribute("counterEnd");
int recordCount=(Integer)request.getAttribute("recordCount");
int maxPage=(Integer)request.getAttribute("maxPage");
int prevStart=0;
int nextPage=0;
int lastRec=0;
int lastStartRecord=0;	
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'main.jsp' starting page</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="css/mainstyle.css">
  </head>
  <body>

<div id="container">

		<div id="top">		
		<div id="topleft"></div>
		<div id="topmiddle">
			<h1 id="topich1"><font color="#DAD3A9">欢迎来到雪狼论坛</font></h1>		
		</div>	
		<div id="topright">
				<table id=userinformation border="1px">
					<tr>
						<td id="userinformationtd1">用户名</td>
						<td id="userinformationtd2">${userInformation[0]}</td>						
					</tr>
					<tr>
						<td>邮箱</td>
						<td>${userInformation[1]}</td>
					</tr>
					<tr>
						<td colspan="2" height="40px">
								<a href="changeInformation.jsp" id="changePersonalInformation_a">亲，点此更改个人资料！！！</a>														
						</td>	
					</tr>					
			</table>
			<div id="topicrightreply">
				<a href="reply.jsp" id="topicrightreply_a">亲，点此可发帖哦！！！</a>				
			</div>			
		</div>		
	</div>
	<div id="gap">假如你没有惊天动地的大事情可以做，那么就做一个小人物，给一个可爱的小孩作父母，给一对老人做孝顺的子女，给你的另一半一个简单而幸福的人生。</div>
	<div id="middle">
		<div id="middleleft"></div>
		<div id="middlecenter">
			<marquee><font color="r#EAD1A8">点击标题进行回复&nbsp;&nbsp;&nbsp;&nbsp;点击标题进行回复&nbsp;&nbsp;&nbsp;&nbsp;点击标题进行回复&nbsp;&nbsp;&nbsp;&nbsp;点击标题进行回复&nbsp;&nbsp;&nbsp;&nbsp;点击标题进行回复</font></marquee>		
			<table align="center" border="1px">
				<tr><td align="center" width="325px">帖  子  标  题</td><td align="center" width="175px">帖  子  作   者</td><td align="center" width="100px">发  表  时  间</td><td align="center" width="100px">点  击  次  数</td></tr>
				
				<tr><%="总共"+recordCount+"条记录 - 当前页："+pageNo+"/"+maxPage %></tr>			
				<c:forEach var = "topic" items="${list}">
				<tr>
  				<td align="center"><a href="ReplyTo?tid=${topic.tid }">${topic.ttopic }</a></td>
					<td align="center">${topic.username }</td>
					<td align="center">${topic.ttime }</td>
					<td align="center"> ${topic.tclickcount }</td>	
				</tr>
				</c:forEach>
			</table>
	
			<div id="page">
			<font size=4 >				
		
			<% 
			  //显示第一页或者前一页的链接
			  //如果当前页不是第1页，则显示第一页和前一页的链接
			  if(pageNo != 1){
				    prevStart = pageNo - 1;
				    out.print("<a href=Main?pageNo=1>第一页 </a>: ");
				    out.print("<a href=Main?pageNo="+prevStart+">前一页</a>");
				  }
			%>
			[
			<% 
			   //打印需要显示的页码
			   for(int c=counterStart;c<=counterEnd;c++){
			   if(c <maxPage){
			     if(c == pageNo){
			       if(c %pageSize == 0){
			         out.print(c);
			       }else{
			          out.print(c+" ,");
			       }
			     }else if(c % pageSize == 0){
			        out.print("<a href=Main?pageNo="+c+">"+c+"</a>");
			     }else{
			        out.print("<a href=Main?pageNo="+c+">"+c+"</a> , ");
			     }
			   }else{
			     if(pageNo == maxPage){
			      out.print(c);
			      break;
			     }else{
			        out.print("<a href=Main?pageNo="+c+">"+c+"</a>");
			     break;
			     }
			   }
			 }															
			%>			
			]			
			<%			
			if(pageNo < maxPage){ //如果当前页不是最后一页，则显示下一页链接
			    nextPage = pageNo + 1;
			    out.print("<a href=Main?pageNo="+nextPage+">下一页</a>");
			}									

			%>
			<%
			
			//同时如果当前页不是最后一页，要显示最后一页的链接
			if(pageNo < maxPage){
			   lastRec = recordCount % pageSize;
			   if(lastRec == 0){
			      lastStartRecord = recordCount - pageSize;
			   }
			   else{
			      lastStartRecord = recordCount - lastRec;
			   }

			   out.print(":");
			    out.print("<a href=Main?pageNo="+maxPage+">最后一页</a>");
			  }						
			%>
		
			</font>
			</div>

		</div>
		<div id="middleright">		
			<div id="backtopbutton">
				<input type="button" width="100" height="100" onclick="location.href='#top'" value="回到顶部" />
			</div>	
		</div>
	</div>
	<div id="bottom">
		<p>笑笑更幸福</p>
		<p>
			某人上街买了一坛好酒，放在小院走廊上，第二天，他发现酒少了5分之1，便在酒桶上贴了不许偷酒四个字。
			第三天酒又少了5分之2，他非常生气又贴了偷酒者重罚5个字。
			第四天，酒还是被偷，他肺都快气炸了。他朋友知道了就对他说；你不会在酒桶上贴尿桶二字啊，看谁还偷喝。他觉得很有道理就照办了。第五天天他哭了。桶满了。
			……等等，故事还没完，第六天，他再一次在酒桶上贴了不许偷酒四个字。
			那一天很多人都哭了。
		</p>	
	</div>
</div>
  </body>
</html>