生成验证码

<%@ page autoFlush="false"import="java.util.*,java.awt.*,java.awt.image.*,com.sun.image.codec.jpeg.*"%><%@ page import="java.lang.*" contentType="text/html; charset=gb2312"%><%@page pageEncoding="GB2312"%><jsp:directive.page import="java.io.OutputStream" /><jsp:directive.page import="javax.imageio.ImageIO" /><jsp:directive.page import="javax.imageio.stream.ImageOutputStream"/><%request.setCharacterEncoding("GB2312");System.out.println(request.getAttribute("time"));%><%BufferedImage b = new BufferedImage(47, 15,BufferedImage.TYPE_INT_RGB);Graphics g = b.getGraphics();g.setColor(new Color(0xC6, 0xDB, 0xF0));g.fillRect(0, 0, 47, 15);g.setColor(new Color(0xC6, 0xDB, 0xF0));g.drawRect(0, 0, 47, 15);//g.drawRect(0, 0, 42, 14);Random rnd = new Random();int type = 0;int n = 0;String line = "";g.setFont(new Font("宋体", Font.ITALIC, 18));//.BOLDfor (int i = 0; i < 100; i++) {int m = rnd.nextInt(50);int l = rnd.nextInt(15);int a = rnd.nextInt(12);int v = rnd.nextInt(12);g.setColor(Color.gray);}Color[] color = new Color[] { Color.red, Color.black, Color.blue,Color.black, Color.WHITE };for (int i = 0; i < 4; i++) {type = rnd.nextInt(3);int t = rnd.nextInt(4);switch (type) {case 0:n = rnd.nextInt(10);break;case 1:n = rnd.nextInt('z' - 'a' + 1) + 'a';break;case 2:n = rnd.nextInt('Z' - 'A' + 1) + 'A';break;}g.setColor(color[t]);if (type == 0) {line += n;g.drawString(new Integer(n).toString(), 2 + (i * 12), 15);} else {char a = (char) n;line += a;g.drawString(String.valueOf(a), 2 + (i * 12), 15);}}session.setAttribute("random", line);response.setContentType("image/jpeg");response.reset();OutputStream os = response.getOutputStream();ImageIO.write(b, "jpg", os);os.close();%>

 

 

验证码生成的JSP文件