JAVA/JSP学习系列之十二(JSP生成jpeg图片用于投票
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一、前言
本文原作者为Tony Wang ,该文章涉及到文件的读写和jpg图片的自动生成。利用jsp+servlet的技术,jsp调用servlet生成图片。
二、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 = 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+"<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 = 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+"");
}
pw.close();
} catch(Exception e) {
System.out.println("Write file error:"+e.getMessage());
}
}
%>
<%
Str
本文原作者为Tony Wang ,该文章涉及到文件的读写和jpg图片的自动生成。利用jsp+servlet的技术,jsp调用servlet生成图片。
二、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 = 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+"<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 = 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+"");
}
pw.close();
} catch(Exception e) {
System.out.println("Write file error:"+e.getMessage());
}
}
%>
<%
Str
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