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<%@ page contentType="image/jpeg" import="java.awt.*,
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java.awt.image.*,java.util.*,javax.imageio.*" %>
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<%!
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Color getRandColor(int fc,int bc)
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{
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Random random = new Random();
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if(fc>255) fc=255;
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if(bc>255) bc=255;
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int r=fc+random.nextInt(bc-fc);
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int g=fc+random.nextInt(bc-fc);
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int b=fc+random.nextInt(bc-fc);
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return new Color(r,g,b);
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}
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%>
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<%
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out.clear();//这句针对resin服务器，如果是tomacat可以不要这句
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response.setHeader("Pragma","No-cache");
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response.setHeader("Cache-Control","no-cache");
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response.setDateHeader("Expires", 0);
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int width=60, height=20;
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BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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Graphics g = image.getGraphics();
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Random random = new Random();
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g.setColor(getRandColor(200,250));
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g.fillRect(0, 0, width, height);
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g.setFont(new Font("Times New Roman",Font.PLAIN,18));
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g.setColor(getRandColor(160,200));
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for (int i=0;i<155;i++)
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{
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int x = random.nextInt(width);
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int y = random.nextInt(height);
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int xl = random.nextInt(12);
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int yl = random.nextInt(12);
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g.drawLine(x,y,x+xl,y+yl);
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}
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String sRand="";
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for (int i=0;i<4;i++){
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String rand=String.valueOf(random.nextInt(10));
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sRand+=rand;
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g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
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g.drawString(rand,13*i+6,16);
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}
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// 将认证码存入SESSION
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session.setAttribute("random",sRand);
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g.dispose();
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ImageIO.write(image, "JPEG", response.getOutputStream());
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%>
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