本文實例講述了JSP實現(xiàn)的簡單Web投票程序。分享給大家供大家參考。具體如下：
這里使用文本文件作為數(shù)據(jù)存儲的投票系統(tǒng)。
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;i4;i++) total+=vote.voteNum[i];
for(int i=0;i4;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(diào)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(diào)查結(jié)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(guān)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(fā)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>
希望本文所述對大家的JSP程序設(shè)計有所幫助。
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