方法二 在 appliction 中藏一个值,可以 固定键,值为计数器,每次投票去查看下当天日期的键下的值是否到达50 ,没有到达计数器+1,进行投票,到达了则不执行投票. 每天0:00 将值设置为0
<p style=line-height: 150%><SPAN style="FONT-SIZE: 12px"><STRONG>这是用文本文件作为存储载体的投票系统：</STRONG></SPAN><p style=line-height: 150%><SPAN style="FONT-SIZE: 12px"><STRONG>vote.java:</STRONG></SPAN>
<SPAN style="FONT-SIZE: 12px"><STRONG></STRONG><p style=line-height: 150%>
// Java Document
package vote
import java.io.*
import java.util.*
public class vote extends Object
{
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=0i<ni++) fileWrite.println("0")
fileWrite.close()
}
}
public void writeFile()
throws FileNotFoundException
{
fileWrite=new PrintWriter(new FileOutputStream(filePath))
for(int i=0i<ni++)
{
fileWrite.println(voteNum[i])
}
fileWrite.close()
}
public void readFile()
throws FileNotFoundException
{
fileRead=new BufferedReader(new FileReader(filePath))
for(int i=0i<ni++)
{
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()
}
}
}
<p style=line-height: 150%><SPAN style="LINE-HEIGHT: 15pt"><SPAN style="FONT-SIZE: 12px"><STRONG>vote.jsp:</STRONG>
<%@ page contentType="text/htmlcharset=gb2312" language="java" errorPage="" %>
<%@ 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></SPAN></SPAN>
<p style=line-height: 150%><STRONG></STRONG><SPAN style="LINE-HEIGHT: 15pt"><SPAN style="FONT-SIZE: 12px"><STRONG>see.jsp:</STRONG>
<%@ page contentType="text/htmlcharset=gb2312" language="java" errorPage="" %>
<%@ 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=0i<4i++) total+=vote.voteNum[i]
for(int i=0i<4i++) voteFlo[i]=150*((float)vote.voteNum[i]/(float)total)
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=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>
</SPAN></SPAN>
<p style=line-height: 150%><SPAN style="LINE-HEIGHT: 15pt"><SPAN style="FONT-SIZE: 12px"><SPAN style="LINE-HEIGHT: 15pt"><SPAN style="FONT-SIZE: 12px"><STRONG>index.jsp:</STRONG>
</SPAN></SPAN>
</SPAN></SPAN><p style=line-height: 150%><SPAN style="LINE-HEIGHT: 15pt"><SPAN style="FONT-SIZE: 12px"><%@ page contentType="text/htmlcharset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=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>
</SPAN></SPAN></SPAN>
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