<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="java.awt.image.*,java.awt.*,javax.imageio.*,java.util.Random" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<%
final int width = 120;
final int height = 25;
BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
g.setColor(new Color(0,0,0));
g.drawRect(0, 0, width, height);
g.setColor(Color.WHITE);
g.fillRect(1, 1, width-2, height-2);
g.setColor(Color.PINK);
g.setFont(new Font("宋体",Font.BOLD,20));
Random random=new Random();
int x=20;
String s="qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM12345678900123456987";
for(int i =0;i<4;i++){
int red=random.nextInt(255);
int green=random.nextInt(255);
int blue=random.nextInt(255);
g.setColor(new Color(red,green,blue));
int str=random.nextInt(s.length());
g.drawString(s.charAt(str)+"", x, 20);
x+=20;
}
for (int i=0;i<20;i++)
{
int p = random.nextInt(width);
int q = random.nextInt(height);
int pl = random.nextInt(12);
int ql = random.nextInt(12);
g.drawLine(p,q,p+pl,q+ql);
}
//添加四个随机字母和数字的组合生成，并添加干扰线
//干扰线绘制使用g.drawLine(开始的x坐标，开始的y坐标，结束的x坐标，结束的y坐标)；
//字符串绘制使用g.drawString(字符串，x坐标，y坐标)；
ServletOutputStream output = response.getOutputStream();
response.reset();
ImageIO.write(image,"jpeg",output);
%>
</form>
</body>
</html>
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