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：

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();

%>

alert("感谢你投了宝贵的一票");

self.location="index.jsp";

3. see.jsp：

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);

%>

查看调查

调查结果
JSP	height=8>
ASP	height=8>
PHP	height=8>
其他	height=8>
关闭窗口

4. index.jsp：

投票

function cw()

{

window.open("see.jsp","mywindow",

"toolbar=no,left=150,top=200,width=270,height=350,menubar=no,systemMenu=no");

}

希望本文所述对大家的JSP程序设计有所帮助。