java生成彩色验证码

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ColorValidateCode.jsp：

<%@ page language="java" pageEncoding="GBK" contentType="text/html;charset=GBK" %>
<%@ page import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %> 
<%@ page import="java.io.OutputStream" %> 
<%! 
	Color getRandColor(int fc,int bc){ 
		Random random = new Random(); 
		if(fc>255) fc=255; 
		if(bc>255) bc=255; 
		int r=fc+random.nextInt(bc-fc); 
		int g=fc+random.nextInt(bc-fc);
		int b=fc+random.nextInt(bc-fc);
		return new Color(r,g,b);
	}
%>

<%
	try{
		response.setHeader("Pragma","No-cache");
		response.setHeader("Cache-Control","no-cache");
		response.setDateHeader("Expires", 0);
		int width=60, height=20;
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		OutputStream os=response.getOutputStream();
		Graphics g = image.getGraphics();
		Random random = new Random();
		g.setColor(getRandColor(200,250));
		g.fillRect(0, 0, width, height);

		g.setFont(new Font("Times New Roman",Font.PLAIN,18));
		g.setColor(getRandColor(160,200));
		for (int i=0;i<155;i++){
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x,y,x+xl,y+yl);
		}
		String sRand="";
		for (int j=0;j<4;j++){
			String rand=String.valueOf(random.nextInt(10));
			sRand+=rand;
			g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
			g.drawString(rand,13*j+6,16);
		}
		session.setAttribute("rand",sRand);
		g.dispose();
		ImageIO.write(image, "JPEG",os);
		os.flush();
		os.close();
		os=null;
		response.flushBuffer();
		out.clear();
		out = pageContext.pushBody();
	}catch(IllegalStateException e){
		System.out.println(e.getMessage());
		e.printStackTrace();
	}
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<body>
		<table align="center" width="100%">
			<tr>
				<td align="center">图片</td>
				<td><input id="colorValidateCode" name="colorValidateCode" type="image" value="${rand}"/>${rand}</td>
			</tr>
		</table>
	</body>
</html>

效果：