java投票系统源代码投票程序java

java编写一个简易单机投票管理器我想知道如何实现选中复选框选项后点击投票实现票数加一并显示

定义三个变量记录每个人的投票数。点击投票按钮后，根据checkbox的勾选情况将三个变量累加。点击查看按钮时展示这三个变量

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JAVA语言中用于投票器的代码如何写

把投票的信息放在 ServletContext对象中。也就是 JSP 内置对象中的application对象。因为投票信息是所有用户都要看的信息，所以要把他放在 ServletContext对象中。这样只要是应用一加载就会创建 ServletContext对象直到应用销毁，也就是服务器关闭时，ServletContext对象才销毁。这样就使得所有用户公用一个对象存储信息。具体的实现那要根据你自己的需求，具体设计。

public class CServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {int n = 0;ServletContext application = getServletContext();Integer num = (Integer) application.getAttribute("num");if (num != null) {n = num;}application.setAttribute("num", ++n);response.setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();out.println("你是第" + n + "个访问者");}}

上面是个类似的例子。你可以参考一下。package servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;这是需要导入的包

用jsp做网上投票系统代码

我之前做过类似的投票小项目，在这里把源码发给你。你自己好好的参考一下。--------------------------package com.tv.bean;public class TVBean {

private String tvName;

private int tvCount;

public String getTvName() {

return tvName;

}

public void setTvName(String tvName) {

this.tvName = tvName;

}

public int getTvCount() {

return tvCount;

}

public void setTvCount(int tvCount) {

this.tvCount = tvCount;

}

}------------------------------package com.tv.dao;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;import com.tv.bean.TVBean;

public class DBUtil {

private Connection con;

private PreparedStatement ps = null;

private ResultSet rs;

public void getCon(){

try {

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=TV","sa","");

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

}

public void closeCon(){

try {

if(rs !=null) rs.close();

if(ps != null) ps.close();

if(con != null) con.close();

} catch (SQLException e) {

e.printStackTrace();

}

public ArrayList getAll(){

ArrayList al = new ArrayList();

this.getCon();

String sql = "select * from TVInfo order by tvCount desc";

try {

ps = con.prepareStatement(sql);

rs = ps.executeQuery();

while(rs.next()){

TVBean tb = new TVBean();

tb.setTvName(rs.getString(1));

tb.setTvCount(rs.getInt(2));

al.add(tb);

}

} catch (SQLException e) {

e.printStackTrace();

} finally {

this.closeCon();

}

return al;

}

public boolean updateByName(String name){

this.getCon();

String sql = "update TVInfo set tvCount=tvCount+1 where tvName='"+name+"'";

try {

ps = con.prepareStatement(sql);

int i = ps.executeUpdate();

if(i 0) return true;

else return false;

} catch (SQLException e) {

e.printStackTrace();

return false;

} finally {

this.closeCon();

}

---------------------------------------package com.tv.servlet;import java.io.IOException;

import java.util.ArrayList;import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;import com.tv.dao.DBUtil;public class VoteServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

request.setCharacterEncoding("UTF-8");

response.setContentType("text/html;charset=UTF-8");

DBUtil dao = new DBUtil();

String [] name = request.getParameterValues("tvs");

int num = name.length;

for(int i =0; i num; i++){

if(dao.updateByName(name[i])){

request.setAttribute("to", "投票成功！");

ArrayList al = dao.getAll();

HttpSession session = request.getSession();

session.setAttribute("al", al);

request.getRequestDispatcher("success.jsp").forward(request, response);

}else{

request.setAttribute("to", "投票失败！请重新再试！");

}

} public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request,response);

}

-----------------------------------%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%

%@taglib prefix="c" uri=" "%html

head

title电视投票/title

/head body

center

form action="vote" method="post"

table border="1" align="center"

tr align="center"

选择您最喜欢的电视剧并投上一票

/h2

/td

/tr

input type="checkbox" name="tvs" value="咏春" /

咏春

/td

/tr

input type="checkbox" name="tvs" value="金婚" /

金婚

/td

/tr

input type="checkbox" name="tvs" value="士兵突击" /

士兵突击

/td

/tr

input type="checkbox" name="tvs" value="少年张三丰" /

少年张三丰

/td

/tr

td align="center"

input type="submit" value=" 提交 " /

input type="reset" value=" 重置 " /

/td

/tr

/table

/form

/center

/body

/html

-------------------------------------第一段代码为JavaBean；第二段代码为数据库连接类；第三段代码为Servlet控制类；第四段代码为JSP显示页面。希望能够解决你的问题！

jsp投票系统求源代码！可以连数据库的！

p style=line-height: 150%SPAN style="FONT-SIZE: 12px"STRONG这是用文本文件作为存储载体的投票系统：/STRONG/SPAN

p style=line-height: 150%SPAN style="FONT-SIZE: 12px"STRONGvote.java:/STRONG/SPAN

SPAN style="FONT-SIZE: 12px"STRONG/STRONG p style=line-height: 150%

// Java Document

package vote;

import java.io.*;

import java.util.*;

public class vote extends Object

{

public String filePath="";

public int n;

private File voteFile;

private BufferedReader fileRead;

private PrintWriter fileWrite;

public String systemMessage="";

private String voteStr[]=new String[10];

public int voteNum[]=new int[10];

public void createFile()

throws FileNotFoundException

{

voteFile=new File(filePath);

if(!voteFile.exists())

{

fileWrite=new PrintWriter(new FileOutputStream(filePath));

for(int i=0;in;i++) fileWrite.println("0");

fileWrite.close();

}

public void writeFile()

throws FileNotFoundException

{

fileWrite=new PrintWriter(new FileOutputStream(filePath));

for(int i=0;in;i++)

{

fileWrite.println(voteNum[i]);

}

fileWrite.close();

}

public void readFile()

throws FileNotFoundException

{

fileRead=new BufferedReader(new FileReader(filePath));

for(int i=0;in;i++)

{

try

{voteStr[i]=fileRead.readLine();

}

catch(IOException f)

{

voteStr[i]="0";}

voteNum[i]=Integer.parseInt(voteStr[i]);

}

try

{

fileRead.close();

}

catch(IOException d)

{

systemMessage=d.toString();

}

p style=line-height: 150%SPAN style="LINE-HEIGHT: 15pt"SPAN style="FONT-SIZE: 12px"STRONGvote.jsp:/STRONG

%@ page contentType="text/html; charset=gb2312" language="java" errorPage="" %

%@ page import="java.util.*"%

%@ page import="java.lang.*"%

%@ page import="java.io.*"%

jsp:useBean id="vote" scope="request" class="vote.vote"/

String vote1=request.getParameter("lang");

vote.n=4;

vote.filePath="vote.txt";

vote.createFile();

vote.readFile();

if(vote1.compareTo("0")==0)

vote.voteNum[0]++;

if(vote1.compareTo("1")==0)

vote.voteNum[1]++;

if(vote1.compareTo("2")==0)

vote.voteNum[2]++;

if(vote1.compareTo("3")==0)

vote.voteNum[3]++;

vote.writeFile();

script language="javascript"

alert("感谢你投了宝贵的一票");

self.location="index.jsp";

/script/SPAN/SPAN

p style=line-height: 150%STRONG /STRONGSPAN style="LINE-HEIGHT: 15pt"SPAN style="FONT-SIZE: 12px"STRONGsee.jsp:/STRONG

%@ page contentType="text/html; charset=gb2312" language="java" errorPage="" %

%@ page import="java.util.*"%

%@ page import="java.lang.*"%

%@ page import="java.io.*"%

jsp:useBean id="vote" scope="request" class="vote.vote"/

String vote1=request.getParameter("lang");

vote.n=4;

vote.filePath="vote.txt";

vote.createFile();

vote.readFile();

int total=0;

float voteFlo[]=new float[5];

for(int i=0;i4;i++) total+=vote.voteNum[i];

for(int i=0;i4;i++) voteFlo[i]=150*((float)vote.voteNum[i]/(float)total);

html

head

meta http-equiv="Content-Type" content="text/html; charset=gb2312"

title查看调查/title

link href="t1.css" rel="stylesheet" type="text/css"

/head

body

table width="30%" border="0" class="t1"

td colspan="2"div align="center"调查结果/div/td

/tr

td width="18%"JSP/td

td width="82%"img src="bar.gif" width=%=voteFlo[0]% height=8 %=vote.voteNum[0]%/td

/tr

tdASP/td

tdimg src="bar.gif" width=%=voteFlo[1]% height=8 %=vote.voteNum[1]%/td

/tr

tdPHP/td

tdimg src="bar.gif" width=%=voteFlo[2]% height=8 %=vote.voteNum[2]%/td

/tr

td其他/td

tdimg src="bar.gif" width=%=voteFlo[3]% height=8 %=vote.voteNum[3]%/td

/tr

td colspan="2"div align="center"a href="javascript:window.close();"关闭窗口/a/div/td

/tr

/table

/body

/html

/SPAN/SPAN

p style=line-height: 150%SPAN style="LINE-HEIGHT: 15pt"SPAN style="FONT-SIZE: 12px"SPAN style="LINE-HEIGHT: 15pt"SPAN style="FONT-SIZE: 12px"STRONGindex.jsp:/STRONG

/SPAN/SPAN

/SPAN/SPAN p style=line-height: 150%SPAN style="LINE-HEIGHT: 15pt"SPAN style="FONT-SIZE: 12px"%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %

html

head

meta http-equiv="Content-Type" content="text/html; charset=gb2312"

title投票/title

link href="t1.css" rel="stylesheet" type="text/css"

/head

script language="javascript"

function cw()

{window.open("see.jsp","mywindow","toolbar=no,left=150,top=200,width=270,height=350,menubar=no,systemMenu=no");

}

/script

body

table width="15%" height="250" align="left"

tdform name="form1" method="post" action="vote.jsp"

table width="100%" height="250" border="1" align="center" bordercolor="#9966CC" class="t1"

tddiv align="left"你所使用的开发语言/div/td

/tr

tdinput type="radio" name="lang" value="0"

JSP/td

/tr

tdinput type="radio" name="lang" value="1"

ASP/td

/tr

tdinput type="radio" name="lang" value="2"

PHP/td

/tr

tdinput type="radio" name="lang" value="3"

其他 /td

/tr

tddiv align="center"

input name="vote" type="image" src="poll.gif" width="40" height="20" border="0"

a href="javascript:cw()"img src="see.gif" width="40" height="20" border="0"/a/div/td

/tr

/table

/form/td

/tr

/table

/body

/html

/SPAN/SPAN/SPAN

Java web投票系统代码和网页制作代码的区别

区别就在于代码内容不同，Javaweb投票系统代码是用JAVA写一个投票系统，代码内容是关于投票的，网页制作代码，代码内容是制作网页。

用java做一个简单的投票系统，有三名表演者，代号，1.2.3。观众依次投票，已数字0结束，然后还

import java.io.BufferedReader;

import java.io.InputStreamReader;

public class Vote {

public static void main(String args[]) {

try {

String[] persons = new String[]{"1","2","3"};

Integer[] votes = new Integer[]{0,0,0};

BufferedReader sin = new BufferedReader(new InputStreamReader(

System.in));

String readline;

System.out.println("================投票开始===============");

System.out.println("请按1，2，3投票，Enter确认");

System.out.println("按0--Enter结束投票，公布结果\n");

readline = sin.readLine(); // 从系统标准输入读入一字符串

while (!readline.equals("0")) {

String voteStr = readline;

if(persons[0].equals(voteStr)){

votes[0] +=1;

}else if(persons[1].equals(voteStr)){

votes[1] +=1;

}else if(persons[2].equals(voteStr)){

votes[2] +=1;

}else{

System.out.println("无效的投票!");

}

readline = sin.readLine(); // 从系统标准输入读入一字符串

} // 继续循环

System.out.println("================投票结束===============");

System.out.println("================结果公布===============");

System.out.println(persons[0]+"================"+persons[1]+"==============="+persons[2]);

System.out.println(votes[0]+"================"+votes[1]+"==============="+votes[2]);

} catch (Exception e) {

System.out.println("Error" + e); // 出错，则打印出错信息

}

新闻名称：java投票系统源代码投票程序java
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java投票系统源代码 投票程序java

java编写一个简易单机投票管理器 我想知道如何实现 选中复选框选项后点击投票实现票数加一并显示

JAVA语言中用于投票器的代码如何写

用jsp做网上投票系统 代码

jsp投票系统求源代码！可以连数据库的！

Java web投票系统代码和网页制作代码的区别

用java做一个简单的投票系统，有三名表演者，代号，1.2.3。观众依次投票，已数字0结束，然后还

其他资讯

java投票系统源代码投票程序java

java编写一个简易单机投票管理器我想知道如何实现选中复选框选项后点击投票实现票数加一并显示

用jsp做网上投票系统代码