主页 > 编程资料 > JSP(JAVA) >
发布时间:2016-01-01 作者:网络 阅读:177次

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]%>
关闭窗口<>

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。

关键字词:JSP编程  

必填

◎已有0人评论

加载更多