这是用文本文件作为存储载体的投票系统:
vote.java:
package vote;
import java.io.*;
import java.util.*;
public class vote extends Object
{
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
}
}
public void writeFile()
throws FileNotFoundException
{
fileWrite=new PrintWriter(new FileOutputStream(filePath));
for(int i=0;i
fileWrite.println(voteNum[i]);
}
fileWrite.close();
}
public void readFile()
throws FileNotFoundException
{
fileRead=new BufferedReader(new FileReader(filePath));
for(int i=0;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();
}
}
}
vote.jsp:
<%@ page contentType="text/html; charset=gb2312" language="java" errorPage="" %>
<%@ 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();
%>
see.jsp:
<%@ page contentType="text/html; charset=gb2312" language="java" errorPage="" %>
<%@ 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);
%>
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]%>
index.jsp:
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>