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);

  }

 }

}