投票功能,JSP源代码代码生成jpeg图片效果
首文件index.jsp如下：
<%--
Author: Tony Wang
E-mail: lucky_tony@163.net
Date: 2001-01-01
如果对程序有什么疑问，可以和我联系， 另外程序如果有什么bug，麻烦指出！！
--%>
<%@ page contentType="text/html;charSet=gb2312"%>
<%
response.setHeader("Cache-Control","no-store");
response.setDateHeader("Expires",0);
%>
<%!
public String[] getQuestion(String s)
{
String[] strQ = new String[4];
String strTemp = null;
int i;
java.io.RandomAccessFile rf = null;
try {
rf = new java.io.RandomAccessFile(s,"r");
} catch(Exception e)
{
System.out.println(e);
System.exit(0);
}
for(i=0;i<4;i )
{
try {
strTemp = rf.readLine();
} catch(Exception e) {
strTemp = "None Question";
}
if(strTemp==null)strTemp = "None Question";
strQ[i] = strTemp;
}
return strQ;
}
%>
<%
String s = null;
String[] question = new String[4];
s = request.getRealPath("question.txt");
question = getQuestion(s);
%>
<html>
<head>
<title></title>
<link href="css.css" rel="StyleSheet" type="text/css"></link>
</head>
<body>
<table width="180" border="1" bordercolor="#999999">
<tr>
<td align=center>冰帆调查</td>
</tr>
<form name=frm method=post action=write.jsp>
<tr>
<td>
<%
String ss = null;
for (int i=0;i<4;i )
{
ss = "<input type="radio" name="choice" value=" i ">"
(char)(′A′ i) "、" question[i] "<br>";
out.println(ss);
}
%>
</td>
</tr>
<tr>
<td align=center><input type=submit value="我 投 一 票"></td>
</tr>
<tr>
<td align=center><img src="/vote/servlet/VoteImage" width=150
height=100></td>
</tr>
</form>
</table>
</body>
</html>
三、写文件write.jsp
<%--
Author: Tony Wang
E-mail: lucky_tony@163.net
Date: 2001-01-01
如果对程序有什么疑问，可以和我联系，
另外程序如果有什么bug，麻烦指出！！
--%>
<%!
public int[] getNumber(String s)
{
int[] mCount = new int[4];
String strTemp = null;
int i;
java.io.RandomAccessFile rf = null;
try {
rf = new java.io.RandomAccessFile(s,"r");
} catch(Exception e)
{
System.out.println(e);
System.exit(0);
}
for(i=0;i<4;i )
{
try {
strTemp = rf.readLine();
} catch(Exception e) {
strTemp = "0";
}
if(strTemp==null)strTemp = "0";
mCount[i] = new Integer(strTemp).intValue();
}
return mCount;
}
public void setNumber(String s,int[] x)
{
try {
java.io.PrintWriter pw = new java.io.PrintWriter(new java.io.
FileOutputStream(s));
for (int i=0;i<4;i ){
pw.println(x[i] "");
}
pw.close();
} catch(Exception e) {
System.out.println("Write file error:" e.getMessage());
}
}
%>
<%
String tmp = null;
int choice = -1;
int[] count = new int[4];
tmp = request.getParameter("choice");
if (tmp==null){
} else {
choice = new Integer(tmp).intValue();
}
/////////////
String s = request.getRealPath("count.txt");
if(choice>=0){
count = getNumber(s);
count[choice] ;
setNumber(s,count);
}
response.sendRedirect("index.jsp");
%>
四、servlet原代码：VoteImage.java :
/*
Author: Tony Wang
E-mail: lucky_tony@163.net
Date: 2001-01-01
如果对程序有什么疑问，可以和我联系，
另外程序如果有什么bug，麻烦指出！！
*/
import java.io.*;
import java.util.*;
import com.sun.image.codec.jpeg.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
public class VoteImage extends HttpServlet
{
private String strFile = null;
private Color color[]={Color.red,Color.black,Color.orange,
Color.green};
private int bas
相关新闻>>
- 发表评论
-
- 最新评论 更多>>
