图片验证码

最新推荐文章于 2025-08-16 06:13:53 发布

spy1403414807

最新推荐文章于 2025-08-16 06:13:53 发布

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分类专栏： jsp 文章标签： random import image string html java

本文链接：https://blog.youkuaiyun.com/spy1403414807/article/details/7025509

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本文介绍了一个简单的验证码生成与验证过程，包括随机字符的生成、图片的绘制以及HTTP响应的设置。通过使用Java语言和相关库，实现了一种基本的验证码系统，确保了网站的安全性。

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page autoFlush="false" import="java.util.*,java.awt.*,java.awt.image.*,
com.sun.image.codec.jpeg.*,java.util.*"%>

<%@ taglib uri="/struts-tags" prefix="s"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>

<body>

<%
String chose=
"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
char display[]={'0',' ','0',' ','0',' ','0'},ran[]={'0','0','0','0'},temp;
Random rand=new Random();
for(int i=0;i<4;i++)
{
temp=chose.charAt(rand.nextInt(chose.length()));
display[i*2]=temp;
ran[i]=temp;
}
String random=String.valueOf(display);
session.setAttribute("random",String.valueOf(ran));
%>
<%
out.clear();
response.setContentType("image/jpeg");
response.addHeader("pragma","NO-cache");
response.addHeader("Cache-Control","no-cache");
response.addDateHeader("Expries",0);
int width=47, height=15;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();//以下填充背景颜色
g.setColor(Color.GREEN);
g.fillRect(0, 0, width, height);//设置字体颜色
g.setColor(Color.RED);
g.drawString(random,3,10);
g.dispose();
ServletOutputStream outStream = response.getOutputStream();
JPEGImageEncoder encoder =JPEGCodec.createJPEGEncoder(outStream);
encoder.encode(image);
outStream.close();

out.clear();
out = pageContext.pushBody();
%>



</body>
</html>