本文实例讲述了jsp实现的简单web投票程序。分享给大家供大家参考。具体如下：
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>
希望本文所述对大家的jsp程序设计有所帮助。
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