📄 index.jsp

📁 投票调查一个很简单的投票调查JSP,能在界面上用条状图显示不同问题的对比关系！

💻 JSP

字号:

<%@ page contentType="text/html;charSet=gb2312"%>
<%
response.setHeader("Cache-Control","no-store");
response.setDateHeader("Expires",0);
%>

<%
String s = null;
String[] question = new String[4];
s = request.getRealPath("question.txt");
String strTemp = null;
int i;
java.io.RandomAccessFile rf = null;
try 
{
	rf = new java.io.RandomAccessFile(s,"r");
} 
catch(Exception e)
{
	System.out.println(e);
}
for(i=0;i<4;i++) 
{
	try 
	{
	strTemp = rf.readLine();
	} 
	catch(Exception e) {
	strTemp = "None Question";
	}
if(strTemp==null)strTemp = "None Question";
question[i] = strTemp;
}
%>
<html>
<head>
<title></title>
</head>
<p>
<body>
<table width="180" border="1" bordercolor="#999999">
<tr>
<td align=center>投票调查</td>
</tr>
<form name=frm method=post action=write.jsp>
<tr> 
<td>
<%
String ss = null;
for (i=0;i<4;i++)
{
ss = "<input type='radio' name='choice' value=" + i+">"+(char)('A'+i)+","+ question[i]+"<br>";
out.println(ss);
}
%>
</td>
</tr>
<tr>
<td align=center><input type=submit value="我 投 一 票"></td>
</tr>

<%
String sCount = null;
int sum = 0;
sCount = request.getRealPath("count.txt");

int[] mCount = new int[4];
java.io.RandomAccessFile rf1 = null;
try {
	rf1 = new java.io.RandomAccessFile(sCount,"r");
} catch(Exception e)
{
	System.out.println(e);
}
for(i=0;i<4;i++) 
{
	strTemp = null;
	try {
	strTemp = rf1.readLine();
	} catch(Exception e)
	{
	strTemp = "0";
	}
	if(strTemp==null) strTemp = "0";

	strTemp.trim();

	try 
	{
		mCount[i] = Integer.parseInt(strTemp);
		sum += mCount[i];
	}
	catch(NumberFormatException e)
	{
		out.println(e);
	}
}
%>
<%
for(i=0;i<4;i++)
{
%>
<tr><td><IMG SRC="a0.bmp" HEIGHT=10 WIDTH=<%if (sum!=0) out.println(mCount[i]*250/sum);%>><%=mCount[i]%></td></tr>
<%
}
%>
</form>
</table>
</body>
</html>

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