JSP 数字验证码模板
2013-11-27 14:01
253 查看
image.jsp
< import="java.awt.PageAttributes.ColorType"%>
< import="org.w3c.dom.ranges.Range"%>
<%@ page language="java" contentType="image/jpeg"
import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"%>
<%!Color getRandColor() {
Random random = new Random();
int r = random.nextInt(256);
int g = random.nextInt(256);
int b = random.nextInt(256);
return new Color(r, g, b);
}%>
<%
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
int i_width = 80;
int i_height = 30;
BufferedImage image = new BufferedImage(i_width, i_height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(getRandColor());
g.fillRect(0, 0, i_width, i_height);
g.setFont(new Font("Times new Roman", Font.PLAIN, 30));
g.setColor(getRandColor());
for (int i = 0; i < 155; i++) {
int i_x = random.nextInt(i_width);
int i_y = random.nextInt(i_height);
int i_x1 = random.nextInt(12);
int i_y1 = random.nextInt(12);
g.drawLine(i_x, i_y, i_x + i_x1, i_y + i_y1);
}
String s_Rand = "";
for (int i = 0; i < 4; i++) {
String rand = String.valueOf(random.nextInt(10));
s_Rand += rand;
g.setColor(getRandColor());
g.drawString(rand, 18 * i+6, 25);
}
session.setAttribute("rand", s_Rand);
g.dispose();
ImageIO.write(image, "JPEG", response.getOutputStream());
%>
用法:
<%@ page contentType="text/html;charset=gb2312" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>认证码输入页面</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="0">
<script type="text/javascript">
function changeimg()
{
var myimg = document.getElementById("code");
now = new Date();
myimg.src="image.jsp?code="+now.getTime();
}
</script>
</head>
<body>
<form method=post action="check.jsp">
<table>
<tr>
<td align=left>体系发生的认证码:</td>
<td><img border=0 id="code" src="image.jsp"><a href="javascript:changeimg()">看不清,换一张 </a></td>
</tr>
<tr>
<td align=left>输入上面的认证码:</td>
<td><input type=text name=rand maxlength=4 value=""></td>
</tr>
<tr>
<td colspan=2 align=center><input type=submit value="提交检测"></td>
</tr>
</form>
</body>
</html>
< import="java.awt.PageAttributes.ColorType"%>
< import="org.w3c.dom.ranges.Range"%>
<%@ page language="java" contentType="image/jpeg"
import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"%>
<%!Color getRandColor() {
Random random = new Random();
int r = random.nextInt(256);
int g = random.nextInt(256);
int b = random.nextInt(256);
return new Color(r, g, b);
}%>
<%
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
int i_width = 80;
int i_height = 30;
BufferedImage image = new BufferedImage(i_width, i_height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(getRandColor());
g.fillRect(0, 0, i_width, i_height);
g.setFont(new Font("Times new Roman", Font.PLAIN, 30));
g.setColor(getRandColor());
for (int i = 0; i < 155; i++) {
int i_x = random.nextInt(i_width);
int i_y = random.nextInt(i_height);
int i_x1 = random.nextInt(12);
int i_y1 = random.nextInt(12);
g.drawLine(i_x, i_y, i_x + i_x1, i_y + i_y1);
}
String s_Rand = "";
for (int i = 0; i < 4; i++) {
String rand = String.valueOf(random.nextInt(10));
s_Rand += rand;
g.setColor(getRandColor());
g.drawString(rand, 18 * i+6, 25);
}
session.setAttribute("rand", s_Rand);
g.dispose();
ImageIO.write(image, "JPEG", response.getOutputStream());
%>
用法:
<%@ page contentType="text/html;charset=gb2312" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>认证码输入页面</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="0">
<script type="text/javascript">
function changeimg()
{
var myimg = document.getElementById("code");
now = new Date();
myimg.src="image.jsp?code="+now.getTime();
}
</script>
</head>
<body>
<form method=post action="check.jsp">
<table>
<tr>
<td align=left>体系发生的认证码:</td>
<td><img border=0 id="code" src="image.jsp"><a href="javascript:changeimg()">看不清,换一张 </a></td>
</tr>
<tr>
<td align=left>输入上面的认证码:</td>
<td><input type=text name=rand maxlength=4 value=""></td>
</tr>
<tr>
<td colspan=2 align=center><input type=submit value="提交检测"></td>
</tr>
</form>
</body>
</html>
相关文章推荐
- 一个JSP数字验证码的案例,我稍作修改加入了简单的加法算术验证码
- 021-动态生成验证码jsp代码模板
- JSP生成数字验证码教程
- JSP验证码系列(数字验证码、英文与数字混合验证码、中文验证码、表达式验证码)
- jsp验证码(数字+字母)
- JSP验证码大全之数字验证码(源码)
- 利用JSP在Web页面中显示随机数字验证码图片
- 用ServletJSP动态生成英文、数字图像验证码
- 用ServletJSP动态生成英文、数字图像验证码
- JSP生成数字验证码
- 利用JSP在Web页面中显示随机数字验证码图片
- 英文.数字和中文混合的彩色验证码【JSP】
- JSP数字验证码
- JSP彩色验证码,生成有4个随机数字和杂乱背景的图片,数字和背景颜色会改变,服务器端刷新
- jsp 比较清晰的验证码(字母和数字的)
- jsp中数字验证码
- 用ServletJSP动态生成英文、数字图像验证码
- jsp生成四位数字的验证码
- JSP数字 验证码
- jsp实现字母和数字验证码功能