[java]
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.log4j.Logger;
import com.ailk.bboss.constants.Constants;
import com.ailk.bboss.util.ImageCode;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/**
* 生成随机验证码
*/ www.zzzyk.com
public class ValidateCodeServlet extends HttpServlet {
private static final long serialVersionUID = -2333646554274127541L;
protected void service(HttpServletRequest req, HttpServletResponse response)
throws ServletException, java.io.IOException {
HttpSession session = req.getSession();
ImageCode image = new ImageCode();
// 将四位数字的验证码保存到Session中。
// 禁止图像缓存。
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/jpeg");
// 将图像输出到Servlet输出流中。
ServletOutputStream outStream = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outStream);
encoder.encode(image.creatImage());
outStream.close();
session.setAttribute(Constants.VALIDATE_CODE, image.getStrRand());
Logger.getLogger(this.getClass()).info(
"image code = " + image.getStrRand() + " cc");
}
}
[java]
<pre name="code" class="java">import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.util.Random;
public class ImageCode {
private String strRand = "";
public final Color[] defCols = { Color.WHITE, Color.BLACK };
private static String[] CHARS = getChars();
public final Font[] defFonts = { new Font("隶书", Font.BOLD, 18),
new Font("宋体", Font.BOLD, 18), new Font("楷体", Font.BOLD, 18),
new Font("黑体", Font.BOLD, 18), new Font("rom7", Font.BOLD, 18) };
private Font getFont(int i) {
Random random = new Random(new Double(Math.random() * 10000 * (i + 1))
.longValue());
int a = random.nextInt(defFonts.length);
AffineTransform trans = new AffineTransform();
trans.scale(1 + random.nextFloat() * 0.2,
0.95 + random.nextFloat() * 0.65);
return defFonts[a].deriveFont(trans);
}
public BufferedImage creatImage() {
int width = 75, height = 20;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(new Color(202, 255, 255));
g.fillRect(0, 0, width, height);
String arr[] = CHARS;
Random rm = new Random(new Double(Math.random() * 10000 * 59)
.longValue());
g.setColor(Color.BLACK);
for (int i = 0; i < 4; i++) {
String rand = arr[rm.nextInt(arr.length)];
strRand += rand;
g.setFont(getFont(i));
if (i == 0)
g.drawString(rand, 2 + random.nextInt(2), 20);
else
g.drawString(rand, 16 * i + 2 + random.nextInt(3), 20);
}
g.dispose();
return image;
}
public String getStrRand() {
return strRand;
}
public void setStrRand(String strRand) {
this.strRand = strRand;
} www.zzzyk.com
private static String[] getChars() {
String[] chars = null;
chars = new String[] { "2", "3", "4", "5", "6", "7", "8", "9", "A",
"B", "D", "E", "F", "G", "H", "J", "K", "L", "M", "N", "P",
