JSP实现在线投票系统之完美版

最新推荐文章于 2025-06-17 13:18:34 发布

原创最新推荐文章于 2025-06-17 13:18:34 发布 · 置顶 · 1.1w 阅读

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#JSP #投票系统 #radio是否选择

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本文介绍了一个简单的在线投票系统的实现过程，包括使用Java进行文件的创建、读取与存储，通过JSP页面展示投票选项并反馈投票结果。系统还支持投票结果的实时查看，并通过条形图直观展示。

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此程序是在前人的版本中，经本博主认真调试更改完善的Web程序。其中实现了文件的创建，单选（radio）是否选择的判断及跳转，鼠标事件的提示（alt）及对文件的读取、存储等等。

下面是实现过程：

vote.java

package vote;


import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;


public class vote{
	public String filePath = "";//文件路径
	public int n;
	private File voteFile;//文件名
	private BufferedReader fileRead;//包装字节流并读入内存
	private PrintWriter fileWrite;//写入数据并格式化
	public String systemMessage = "";//系统信息
	private String voteStr[] = new String[10];
	public int voteNum[] = new int[10];
	
	public void createFile() throws FileNotFoundException{//创建文件，抛出异常
		voteFile = new File(filePath);
		if(!voteFile.exists()){
			fileWrite = new PrintWriter(new FileOutputStream(filePath));//流文件写出
			for(int i = 0;i < n;i ++)
				fileWrite.println("0");
			fileWrite.close();
		}
	}
	
	public void writeFile() throws FileNotFoundException{
		fileWrite = new PrintWriter(new FileOutputStream(filePath));
		for(int i = 0;i < n;i ++){
			fileWrite.println(voteNum[i]);
		}
		fileWrite.close();
	}
	
	public void readFile() throws FileNotFoundException{
		fileRead = new BufferedReader(new FileReader(filePath));
		for(int i = 0;i < n;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();
		}
	}
}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>投票</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
      <script language = "javascript">
          function cw(){ //弹出查看投票结果窗口
              window.open("see.jsp","mywindow","left = 550,top = 200,width = 270,height = 350");//menubar：是否显示菜单栏 ；toolbar：是否显示工具栏 ；systemMenu：系统菜单
          }
          function check(){ //判断投票是否选择
              var result=false;
              for(var i=0;i<document.form1.lang.length;i++){
                  if(document.form1.lang[i].checked){
                        result = true;
                  }
              }
              if(!result){
                  alert("请选择投票！");
              }
              return result;
          }
      </script>
  <body>
      <table width = "15%" height = "250" align = "center">
          <tr>
              <td><form name = "form1" method = "post" action = "vote.jsp" onsubmit = "return check()">
                  <!-- 投票界面内容 -->
                  <table width = "100%" height = "250" border = "1" align = "center" bordercolor = "#9966CC" class = "t1" style="height: 325px; width: 230px; ">
                      <tr>
                          <td><div align = "left">你所使用的开发语言</div></td>
                      </tr>
                      <tr>
                          <td style = "width = 116px;height = 22px;"><input type = "radio" name = "lang" value = "0">JSP</td>
                      </tr>
                      <tr>     <!-- checked 默认选择 -->
                          <td><input type = "radio" name = "lang" value = "1">ASP</td>
                      </tr>
                      <tr>
                          <td><input type = "radio" name = "lang" value = "2">PHP</td>
                      </tr>
                      <tr>
                          <td><input type = "radio" name = "lang" value = "3">其他</td>
                      </tr>
                      <tr>
                          <td>
                              <!-- 采用相对位置 浮动定位 -->
                              <div style = "position:relative;right:50px;top:25%;float:right"><input name = "vote" type = "image" src = "Image/poll.gif" width = "40" height = "40" border = "0" alt = "投票"></div><!-- onclick = "return false" -->
                              <div style = "position:relative;left:50px;top:25%;float:left"><a href = "javascript:cw()"><img src = "Image/see.gif" width = "40" height = "40" border = "0" alt = "查看结果"></a></div> <!-- title -->
                          </td>
                      </tr>
                  </table>
              </form></td>
          </tr>
      </table>
  </body>
</html>

see.jsp //实现对投票结果的查看

<%@ page language="java" import="java.util.*,java.util.*,java.io.*" pageEncoding="GB2312"%>
<%@ page import="vote.*"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%
    String vote1 = request.getParameter("lang");
    vote vote = new vote();
    vote.n = 4;
    vote.filePath = "vote.txt";
    vote.createFile();
    vote.readFile();
    int total = 0;  //投票总数
    float voteFlo[] = new float[5];
    for(int i = 0;i <4;i ++)
        total += vote.voteNum[i];
    for(int i = 0;i <4;i ++)
        voteFlo[i] = 150*((float)vote.voteNum[i]/(float)total);
 %>
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>查看调查</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  <body>
      <table width = "30%" border = "0" class = "tb1">
          <tr>
              <td colspan = "2"><div align = "center">调查结果</div></td>
          </tr>
          <tr>
              <td width = "18%">JSP</td>
              <td width = "18%"><img src = "Image/bar.png" width = <%= voteFlo[0] %> height = 8><%= vote.voteNum[0] %></td>
          </tr>
          <tr>
              <td width = "18%">ASP</td>
              <td width = "18%"><img src = "Image/bar.png" width = <%= voteFlo[1] %> height = 8><%= vote.voteNum[1] %></td>
          </tr>
          <tr>
              <td width = "18%">PHP</td>
              <td width = "18%"><img src = "Image/bar.png" width = <%= voteFlo[2] %> height = 8><%= vote.voteNum[2] %></td>
          </tr>
          <tr>
              <td width = "18%">其他</td>
              <td width = "18%"><img src = "Image/bar.png" 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>

vote.jsp //实现在线投票并写入文件

<%@ page language="java" import="java.util.*,java.io.*" pageEncoding="GB2312"%>
<%@ page import = "vote.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%
    String vote1 = request.getParameter("lang");
    vote vote = new vote();
    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] ++;
    if(vote1.compareTo("0") == 0)
        vote.voteNum[0] ++;
    //else out.println("<script language = 'javascript'>alert('qing投票。');self.location = 'index.jsp';</script>");
    vote.writeFile();
 %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'vote.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	<script language = "javascript">
        alert("感谢你的投票。");
        self.location = "index.jsp";
    </script>
  </head>
  
  <body>
  
  </body>
</html>