JSP实现在线投票系统

其他 2018-05-07 08:57:07 阅读次数: 4

系统介绍
一个网站的发展壮大靠的就是众多用户的支持，一个好的网站一定要注意与用户之间信息的交流，及时得到用户反馈信息，并及时改进，这也是一个网站持续发展的基础。也正是由于该原因，网络上各式各样的投票系统层出不穷。接下来的项目，就是来编制一个在线投票系统，该系统可以对投票数量进行累加、查询统计票数等操作。
操作注意事项
1．在进行投票操作时，一个小时内只能投一次票。
效果图显示：
这里写图片描述
这里写图片描述
这里写图片描述

代码如下：
数据库建库建表代码：

create database votedb;
create table users(
    id int(10) auto_increment primary key,
    ip varchar(20) not null,
    lastTime long(8) not null
);
create table vote(
    id int(10) auto_increment primary key,
    title varchar(50) not null,
    num int not null
);
insert into users(ip, lastTime) values
    ('001',1),
    ('002',2),
    ('003',3),
    ('004',4);
insert into vote(title, num) values
    ('潘玮柏',20),
    ('周杰伦',30),
    ('justin',40),
    ('杨非同',25);

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>在线投票系统</title>
</head>
<body>
    <h1>在线投票系统</h1>
    <div>
        <a href = "vote.jsp"><input type ="button" value = "在线投票"/></a>
        <br/>
        <a href = "showVote.jsp"><input type ="button" value = "投票结果"/></a>
    </div>

</body>
</html>

vote.jsp

<%@page import="com.valuebean.UserSingle"%>
<%@page import="com.valuebean.voteSingle"%>
<%@page import="java.util.ArrayList"%>
<%@page import="java.sql.ResultSet"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<jsp:useBean id="db" class = "com.database.DB" scope = "session"></jsp:useBean>
<!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">
<style type="text/css">
    .a{
        border: 1px solid;
    }
</style>
<title>在线投票</title>
</head>
<body>
    <form action="doVote.jsp" method = "post">
    <table>
    <%
        ArrayList<voteSingle> votes = db.getVotes();
        if(votes == null || votes.size() == 0){
    %>
            <tr>
                <td>无内容可以显示</td>
            </tr>
    <%
        }else{
            for(int i = 0, length = votes.size(); i < length; i++){
    %>
    <tr class = "a">
        <td class = "a">
            <%= votes.get(i).getTitle() %>
        </td>
        <td class = "a">
            <input type = "radio" name = "like" value="<%=votes.get(i).getId()%>"></input>
        </td>
    </tr>
        <br/>
    <%
        }
    }
    %>
    <tr>
        <td>
            <input type = "submit" value = "提交"/>
        </td>
        <td>
            <input type = "reset" value = "重置"/>
        </td>
        <td>
            <a href = "index.jsp">
                <input type = "button" value = "返回主界面">
            </a>
        </td>
        <td>
            <a href = "showVote.jsp">
                <input type = "button" value = "显示投票结果">
            </a>
        </td>
    </tr>
    </table>
    </form>
</body>
</html>

dovote.jsp

<%@page import="com.valuebean.voteSingle"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@page import="java.util.Date"%>
<%@page import="com.valuebean.UserSingle"%>
<%@page import="com.toolbean.MyTool"%>
<jsp:useBean id="db" class = "com.database.DB" scope = "session"></jsp:useBean>
<%
    long cc = 0, dd = 0;
    int id = MyTool.strToInt(request.getParameter("like"));
    int flag = -1, i = -1;
    String sql = "";
    Date date = new Date();
    long today = date.getTime();
    voteSingle v =db.findvote(id);
    String mes = "";
    long lastTime = 0;
    String ip = "005";
    //String ip = request.getRemoteAddr();
    UserSingle u = db.findUser(ip);
    if(u == null){
        u = new UserSingle();
        u.setIp(ip);
        u.setLastTime(today);
        flag = 0;
    }else{
        lastTime = u.getLastTime();
        cc = today;
        dd = lastTime;
        if((today - lastTime) >= 60 * 60 * 1000){
            flag  = 1;
        }else{
            flag = 2;
        }
    }
    if(flag == 0){
        sql = "insert into users(ip, lastTime) values('"+ip+"','+"+today+"')";
        i = db.update(sql);
        if(i < 0){
            System.out.println("插入user失败！");
            i = -1;
        }
        sql = "update vote set num=num+1 where id="+id;
        i = db.update(sql);
        if(i < 0){
            System.out.println("更新vote表失败（num+1）");
            i = -1;
        }
    }
    if(flag == 1){
        sql = "update vote set num=num+1 where id="+id;
        i = db.update(sql);
        if(i < 0){
            System.out.println("更新vote表失败（num+1）");
            i = -1;
        }
        sql = "update users set lastTime ="+today+" where ip= '"+ip+ "'";
        i = db.update(sql);
        if(i < 0){
            System.out.println("更新user表失败lastTime=today");
            i = -1;
        }
    }
    if(flag == 2){
        mes = u.getIp()+" 为  "+v.getTitle()+" 投票失败，距离上一次投票不足一小时，上一次投票时间为"+MyTool.formatDate(lastTime);
    }
    if(flag == 1){
        mes = u.getIp()+" 为  "+v.getTitle()+" 投票成功，当前投票时间为：" + MyTool.formatDate(today);
    }
    if(flag == 0){
        mes = u.getIp()+" 为 "+v.getTitle()+" 首次投票成功，当前投票时间为：" + MyTool.formatDate(today);
    }
    session.setAttribute("mes", mes);
    response.sendRedirect("message.jsp");
%>

message.jsp

<%@ page contentType="text/html; charset=UTF-8"%>
<%
  String message=(String)session.getAttribute("mes");
  session.invalidate();
%>
<html>
    <head>
        <title>友情提示</title>     
    </head>
    <body bgcolor="#F0F0F0">
      <table>
        <tr>
            <td>
                <%=message %>
            </td>
        </tr>
        <tr height="114">
           <td align="center" valign="top">
               <a href="index.jsp"><input type = "button" value = "返回首页"></a>
               <a href="vote.jsp"><input type = "button" value = "继续投票"></a>
               <a href="showVote.jsp"><input type = "button" value = "查看结果"></a>
           </td>
        </tr>
      </table>
    </body>
</html>

showVote.jsp

<%@page import="com.toolbean.MyTool"%>
<%@page import="com.valuebean.voteSingle"%>
<%@page import="java.util.ArrayList"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<jsp:useBean id="db" class = "com.database.DB" scope = "session"></jsp:useBean>
<!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>投票结果</title>
</head>
<body>
        <table>
    <%
        ArrayList<voteSingle> votes = db.getVotes();
        int numAll = 0;
        float picLen = 0;
        if(votes == null || votes.size() == 0){
    %>
            <tr>
                <td>无内容可以显示</td>
            </tr>
    <%
        }else{
            for(int i = 0, length = votes.size(); i < length; i++){
                numAll += MyTool.strToInt(votes.get(i).getNum());
            }
            for(int i = 0, length = votes.size(); i < length; i++){
                picLen = MyTool.strToInt(votes.get(i).getNum()) * 145 / numAll;
    %>
    <tr class = "a">
        <td class = "a">
            <%= votes.get(i).getTitle() %>
        </td>
        <td class = "a">
            <img src="img/l.jpg" width="<%=picLen%>" height = "15"/>
        </td>
        <td class = "a">
            <%=votes.get(i).getNum()%>
        </td>
    </tr>
        <br/>
    <%
        }
    }
    %>
    <tr>
        <td>
            <a href = "index.jsp">
                <input type = "button" value = "返回主界面">
            </a>
        </td>
        <td>
            <a href = "vote.jsp">
                <input type = "button" value = "在线投票">
            </a>
        </td>
    </tr>
    </table>
</body>
</html>

DB.java(数据库操作）

package com.database;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.Statement;
import com.valuebean.UserSingle;
import com.valuebean.voteSingle;

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

public class DB {
    private String className;
    private String url;
    private String username;
    private String password;
    private Connection con;
    private Statement st;
    private ResultSet res;
    public DB() {
        className="com.mysql.jdbc.Driver";
        url="jdbc:mysql://localhost:3306/votedb";
        username = "root";
        password = "3.14159";
    }
    public void loadDriver() {
        try {
            Class.forName(className);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            System.out.println("加载数据库驱动失败！");
            e.printStackTrace();
        }
    }
    public void getConnection() {
        loadDriver();
        try {
            con = (Connection) DriverManager.getConnection(url, username, password);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            System.out.println("连接数据库失败！");
            e.printStackTrace();
        }
    }
    public void getStatement() {
        getConnection();
        try {
            st = (Statement) con.createStatement();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            System.out.println("获取statement对象失败");
            e.printStackTrace();
        }
    }
    public void getResultSet(String sql) {
        if(sql != null && !sql.equals("")) {
            getStatement();
            try {
                res = st.executeQuery(sql);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                System.out.println("查询数据库失败！");
                e.printStackTrace();
            }
        }
    }
    public void closed() {
        try {
            if(res != null) {
                res.close();
            }
            if(con != null) {
                con.close();
            }
            if(st != null) {
                st.close();
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            System.out.println("关闭数据库失败！");
            e.printStackTrace();
        }
    }
    public int update(String sql) {
        int i = -1;
        if(sql != null && !sql.equals("")) {
            getStatement();
            try {
                i = st.executeUpdate(sql);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                System.out.println("数据库更新失败！");
                e.printStackTrace();
            }finally {
                closed();
            }
        }
        return i;
    }
    public ArrayList<voteSingle> getVotes(){
        String sql = "select * from vote";
        getResultSet(sql);
        ArrayList<voteSingle> votes = new ArrayList<voteSingle>();
        try {
            while(res.next()) {
                voteSingle v = new voteSingle();
                v.setId(res.getString(1));
                v.setTitle(res.getString(2));
                v.setNum(res.getString(3));
                votes.add(v);
            }
            res.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return votes;
    }
    public ArrayList<UserSingle> getUsers(){
        String sql = "select * from users";
        getResultSet(sql);
        ArrayList<UserSingle> users = new ArrayList<UserSingle>();
        try {
            while(res.next()) {
                UserSingle u = new UserSingle();
                u.setId(res.getString(1));
                u.setIp(res.getString(2));
                u.setLastTime(res.getLong(3));
                users.add(u);
            }
            res.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return users;
    }
    public UserSingle findUser(String ip) {
        UserSingle u = null;
        String sql = "select * from users where ip = '" + ip + "'";
        getResultSet(sql);
        if(res != null) {
            try {
                while(res.next()) {
                    u = new UserSingle();
                    u.setId(res.getString(1));
                    u.setIp(res.getString(2));
                    u.setLastTime(res.getLong(3));
                }
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                System.out.println("封装users表中数据失败！finduser函数");
                e.printStackTrace();
            }finally {
                closed();
            }
        }
        return u;
    }
    public voteSingle findvote(int id) {
        voteSingle u = new voteSingle();
        String sql = "select * from vote where id = " + id;
        getResultSet(sql);
        if(res == null) {
            u = null;
            return u;
        }else {
            try {
                while(res.next()) {
                    u.setId(res.getString(1));
                    u.setTitle(res.getString(2));
                    u.setNum(res.getString(3));
                }
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return u;
        }
    }
}

UserSingle.java

package com.valuebean;

public class UserSingle {
    private String id;
    private String ip;
    private long lastTime;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getIp() {
        return ip;
    }
    public void setIp(String ip) {
        this.ip = ip;
    }
    public long getLastTime() {
        return lastTime;
    }
    public void setLastTime(long lastTime) {
        this.lastTime = lastTime;
    }
}

voteSingle.java

package com.valuebean;

public class voteSingle {
    private String id;
    private String title;
    private String num;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getNum() {
        return num;
    }
    public void setNum(String num) {
        this.num = num;
    }
}

MyTool.java

扫描二维码关注公众号，回复： 133226 查看本文章 
package com.toolbean;

import java.io.UnsupportedEncodingException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MyTool {
    public static String toChinese(String str) {
        if(str == null) {
            str="";
        }
        try {
            str = new String(str.getBytes("ISO-8859-1"),"gb2312");
        }catch(UnsupportedEncodingException e) {
            str="";
            e.printStackTrace();
        }
        return str;
    }
    public static int strToInt(String str) {
        if(str == null || str.equals("")) {
            str = "0";
        }
        int i = 0;
        try {
            i = Integer.parseInt(str);
        }catch(NumberFormatException e) {
            i = 0;
            e.printStackTrace();
        }
        return i;
    }
    public static String formatDate(long ms){
        Date date=new Date(ms);
        SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String strDate=format.format(date);
        return strDate;
    }
}

猜你喜欢

转载自blog.csdn.net/cactus_lrg/article/details/79989741
今日推荐
开源日报 | Chrome内置Gemini的意义不在于Gemini；中国AI追随之路的五大误区；ECharts创始人“下海”养鱼；谷歌I/O开发者大会什么都有，只是没有惊喜
微软回应中国区AI团队“打包赴美”传闻
基于大语言模型的开源知识库问答系统 MaxKB GitHub Star 数量突破 5,000 个！
美国拟限制 AI 大模型出口中国和俄罗斯
苹果将与 OpenAI 达成协议，将 ChatGPT 应用于 iPhone
openKylin 社区生态委员会第六次会议圆满召开
阿里云正式发布通义千问 2.5
Python 3.13 发布首个 Beta：实验性自由线程模式和 JIT、改进交互式解释器
Stack Overflow 拿我的代码去训练 AI 大模型，还封了我的账号
Pop!_OS 的 COSMIC 桌面完成 App Store 上架工作
《2024 年一季度互联网投融资运行情况》研究报告
报告：Django 仍然是 74% 开发者的首选
周排行
返回指定时间格式
fopen函数中的mode参数
Java 单例模式探讨
Flex remoteobject工作原理探讨
寻找mplayer的便捷安装方法
30天了解30种技术系列---(26)MySQL自动化运维工具Inception
关于Jboss/Tomcat/Jetty的JNDI定义123
程序减肥，strip，eu-strip 及其符号表
AsyncTask、View.post(Runnable)、ViewTreeObserver三种方式总结frame animation自动启动
Json和Bean的互相转换
每日归档
更多
2024-05-15(24)
2024-05-14(0)
2024-05-13(18)
2024-05-12(0)
2024-05-11(38)
2024-05-10(38)
2024-05-09(35)
2024-05-08(42)
2024-05-07(14)
2024-05-06(40)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022