📄 image.jsp
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<%@ page contentType="image/jpeg" language="java"
import="java.io.*"
import="java.awt.*"
import="javax.imageio.ImageIO"
import="java.awt.image.BufferedImage"
pageEncoding="GBK"
%>
<html>
<head>
<title>验证码选择</title>
</head>
<body>
<%
try{
BufferedImage bf=new BufferedImage(70,25,BufferedImage.TYPE_INT_RGB);
Graphics2D g2=bf.createGraphics();
g2.setPaint(new Color(0,0,255));
g2.fillRect(0,0,70,25);
g2.setPaint(new Color(255,255,255));
String str=request.getParameter("num");
session.setAttribute("num",str);
g2.setFont(new Font("Arial",Font.BOLD,24));
g2.drawString(str,7,20);
for(int i=0;i<10;i++){
int r=(int)(Math.random()*255);
int g=(int)(Math.random()*255);
int b=(int)(Math.random()*255);
g2.setPaint(new Color(r,g,b));
int x1=(int)(Math.random()*80);
int y1=(int)(Math.random()*30);
int x2=(int)(Math.random()*80);
int y2=(int)(Math.random()*30);
g2.drawLine(x1,y1,x2,y2);
}
g2.dispose();
ImageIO.write(bf,"jpg",response.getOutputStream());
}catch(Exception e){
System.out.println(e);
}
%>
</body>
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