选举投票系统java代码 java简单编写投票系统

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选举投票系统java代码,所以要把选举投票系统java代码他放在 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
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选举投票系统java代码的投票数 。点击投票按钮后选举投票系统java代码,根据checkbox选举投票系统java代码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
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(i0) 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; inum; 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="https://www.04ip.com/post/咏春" /
咏春
/td
/tr
tr
td
input type="checkbox" name="tvs" value="https://www.04ip.com/post/金婚" /
金婚
/td
/tr
tr
td
input type="checkbox" name="tvs" value="https://www.04ip.com/post/士兵突击" /
士兵突击
/td
/tr
tr
td
input type="checkbox" name="tvs" value="https://www.04ip.com/post/少年张三丰" /
少年张三丰
/td
/tr
tr
td align="center"
input type="submit" value="https://www.04ip.com/post/提交" /
input type="reset" value="https://www.04ip.com/post/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!
java编写程序观众每人投一票,最后输出7位歌手排名import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.Scanner;
public class Test {
public static void Ballots() {
Scanner sc = new Scanner(System.in);
int[] count = new int[7];
String instr = "";
int spoiled = 0, sum = 0;
for (int i = 0; icount.length; i) {
count[i] = 0;
}
System.out.println("输入方框数字代码投票给歌手,输入.结束 ");
do {
System.out.print("张学友[0], 刘德华[1], 小刚[2], 孙燕姿[3], 梁静茹[4], 王杰[5], 刘若英[6])? ");
instr = sc.nextLine();
if (instr.equals("0")) {
count[0];
} else if (instr.equals("1")) {
count[1];
} else if (instr.equals("2")) {
count[2];
} else if (instr.equals("3")) {
count[3];
} else if (instr.equals("4")) {
count[4];
} else if (instr.equals("5")) {
count[5];
} else if (instr.equals("6")) {
count[6];
} else {
if (!instr.equals(".")) {
spoiled;
}
}
} while (!instr.equals("."));
System.out.println("投票结束,结果是 : \n");
System.out.println("歌手\t\t得票数");
System.out.println("======\t\t=========");
for (int i = 0; icount.length; i) {
if (i == 0) {
System.out.println("张学友\t\t"count[i]);
} else if (i == 1) {
System.out.println("刘德华\t\t"count[i]);
} else if (i == 2) {
System.out.println("小刚\t\t"count[i]);
} else if (i == 3) {
System.out.println("孙燕姿\t\t"count[i]);
} else if (i == 4) {
System.out.println("梁静茹\t\t"count[i]);
} else if (i == 5) {
System.out.println("王杰\t\t"count[i]);
}else if (i == 6) {
System.out.println("刘若英\t\t"count[i]);
}
}
for (int t : count) {
sum= t;
}
System.out.println("弃权票数: "spoiled);
System.out.println("总票数: "sum);
}
public static void main(String[] args) {
System.out.println("投票开始:");
Scanner sc = new Scanner(System.in);
String is = "";
do {
Ballots();
System.out.println("继续第二轮投票? (y/n):");
is = sc.nextLine();
} while (is.equals("y"));
}
}
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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