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"

td

h2

选择您最喜欢的电视剧并投上一票

/h2

/td

/tr

tr

td

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

咏春

/td

/tr

tr

td

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

金婚

/td

/tr

tr

td

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

士兵突击

/td

/tr

tr

td

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

少年张三丰

/td

/tr

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"

tr

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

/tr

tr

td width="18%"JSP/td

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

/tr

tr

tdASP/td

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

/tr

tr

tdPHP/td

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

/tr

tr

td其他/td

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

/tr

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"

tr

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

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

tr

tddiv align="left"你所使用的开发语言/div/td

/tr

tr

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

JSP/td

/tr

tr

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

ASP/td

/tr

tr

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

PHP/td

/tr

tr

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

其他 /td

/tr

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

}

}

}

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