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JSP实现的简单Web投票程序代码_JSP编程_

2023-05-25 162人已围观

简介 JSP实现的简单Web投票程序代码_JSP编程_

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.*"%><% 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(); %>

3. see.jsp:

<%@ page contentType="text/html; charset=gb2312" %><%@ page import="java.util.*"%><%@ page import="java.lang.*"%><%@ page import="java.io.*"%><% 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><%=vote.voteNum[0]%>
ASP height=8><%=vote.voteNum[1]%>
PHP height=8><%=vote.voteNum[2]%>
其他 height=8><%=vote.voteNum[3]%>

4. index.jsp:

<%@ page contentType="text/html; charset=gb2312" %>投票
你所使用的开发语言
JSP
ASP
PHP
其他

希望本文所述对大家的JSP程序设计有所帮助。

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