現在我們經常可以在朋友圈中看到投票程序，那么就會有小伙伴好奇JSP怎么實現Web投票程序呢？那么現在我們就帶著這個疑問一起去看看JSP實現Web投票程序的代碼。
這里使用文本文件作為數據存儲的投票系統。
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("感謝你投了寶貴的一票"); 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>查看調查</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">調查結果</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();">關閉窗口</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">你所使用的開發語言</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>這篇文章主要介紹了JSP實現Web投票程序的代碼，為大家詳細的分析了JSP實現投票功能的具體步驟與相關技巧。
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