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java投票管理系统代码 java投票管理系统代码查询
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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
相关问答
Q1: 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
}
}
}
Q2: 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！
Q3: 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
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