JSP实现Web投票程序的代码

2024-09-05 00:18:57

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现在我们经常可以在朋友圈中看到投票程序，那么就会有小伙伴好奇JSP怎么实现Web投票程序呢？那么现在我们就带着这个疑问一起去看看JSP实现Web投票程序的代码。

这里使用文本文件作为数据存储的投票系统。

1. vote.java：

package vote;import java.io.*;import java.util.*;public class vote { 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; 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();  } }}

2. vote.jsp：

<%@ page contentType="text/html; charset=gb2312" %><%@ 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>

3. see.jsp：

<%@ page contentType="text/html; charset=gb2312" %><%@ 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;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><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>  <td>ASP</td> <td><img src="bar.gif" width=<%=voteFlo[1]%> height=8> <%=vote.voteNum[1]%></td> </tr> <tr>  <td>PHP</td> <td><img src="bar.gif" width=<%=voteFlo[2]%> height=8> <%=vote.voteNum[2]%></td> </tr> <tr>  <td>其他</td> <td><img 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>

4. index.jsp：

<%@ page contentType="text/html; charset=gb2312" %><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> <td><form name="form1" method="post" action="vote.jsp">  <table width="100%" height="250" border="1" align="center" bordercolor="#9966CC" class="t1">   <tr>   <td><div align="left">你所使用的开发语言</div></td>   </tr>   <tr>   <td><input type="radio" name="lang" value="0">    JSP</td>   </tr>   <tr>   <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><div 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>

这篇文章主要介绍了JSP实现Web投票程序的代码，为大家详细的分析了JSP实现投票功能的具体步骤与相关技巧。

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