生成带干扰线的验证码

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.yitong.commons.model.SessConsts;

@Controller
public class ImageCode {

 private Logger logger = Logger.getLogger(this.getClass());

 private final int width = 60;
 private final int height = 20;
 private final int codeCount = 4;

 private final int x = width / (codeCount + 1);
 private final int fontHeight = height - 2;
 private final int codeY = height - 4;

 final char[] codeSequence = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
   '9' };
 
 @RequestMapping("/xxxx/xxxxxxx")
 public void execute(HttpServletRequest request, HttpServletResponse response) {
  try {
   BufferedImage buffImg = new BufferedImage(width, height,
     BufferedImage.TYPE_INT_RGB);
   Graphics2D g = buffImg.createGraphics();

   Random random = new Random();

  
   buffImg = g.getDeviceConfiguration().createCompatibleImage(width,
     height, Transparency.TRANSLUCENT);
   g.dispose();
   g = buffImg.createGraphics();
 

   
   // g.setColor(Color.WHITE);
   // g.fillRect(0, 0, width, height);

   
   Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
 
   g.setFont(font);
   g.setColor(Color.BLACK);

   
   for (int i = 0; i < 8; 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);
   }

   
   StringBuffer randomCode = new StringBuffer();
   int red = 0, green = 0, blue = 0;

   for (int i = 0; i < codeCount; i++) {
    String strRand = String
      .valueOf(codeSequence[random.nextInt(10)]);
   
    red = random.nextInt(100);
    green = random.nextInt(155);
    blue = random.nextInt(100);

 
    g.setColor(new Color(155 + red, green, 155 + blue));
    g.drawString(strRand, (i + 1) * x, codeY);

   
    randomCode.append(strRand);
   }

   HttpSession session = request.getSession();
   session.setAttribute(SessConsts.IMG_CODE, randomCode.toString());
   response.setHeader("Pragma", "no-cache");
   response.setHeader("Cache-Control", "no-cache");
   response.setDateHeader("Expires", 0);

   response.setContentType("image/png");
   ServletOutputStream sos = response.getOutputStream();
   ImageIO.write(buffImg, "png", sos);
// sos.close();
   sos.flush();
  } catch (Exception e) {
   logger.error("error", e);
  }
 }
}

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