Struts中Action产生的图形验证码

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ACTION代码：

*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package hospital.lb.action;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
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.commons.lang.RandomStringUtils;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
/**
* MyEclipse Struts
*
* XDoclet definition:
* @struts.action validate="true"
*/
public class ValidatecodeAction extends Action {
/*
  * Generated Methods
  */
/**
  * Method execute
  * @param mapping
  * @param form
  * @param request
  * @param response
  * @return ActionForward
  */
  public ActionForward execute(ActionMapping mapping, ActionForm form,
        HttpServletRequest request, HttpServletResponse response) {
      try {
        int width = 50;
        int height = 18;
        // 取得一个4位随机字母数字字符串
        String s = RandomStringUtils.random(4, true, true);

        // 保存入session,用于与用户的输入进行比较.
        // 注意比较完之后清除session.
        HttpSession session = request.getSession(true);
        session.setAttribute("validateCode", s);

        response.setContentType("images/jpeg");
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);

        ServletOutputStream out = response.getOutputStream();
        BufferedImage image = new BufferedImage(width, height,
            BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();
        // 设定背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);

        // 设定字体
        Font mFont = new Font("Times New Roman", Font.BOLD, 18);// 设置字体
        g.setFont(mFont);

        // 画边框
        // g.setColor(Color.BLACK);
        // g.drawRect(0, 0, width - 1, height - 1);

        // 随机产生干扰线，使图象中的认证码不易被其它程序探测到
        g.setColor(getRandColor(160, 200));
        // 生成随机类
        Random random = new Random();
        for (int i = 0; i < 155; i++) {
          int x2 = random.nextInt(width);
          int y2 = random.nextInt(height);
          int x3 = random.nextInt(12);
          int y3 = random.nextInt(12);
          g.drawLine(x2, y2, x2 + x3, y2 + y3);
        }

        // 将认证码显示到图象中
        g.setColor(new Color(20 + random.nextInt(110), 20 + random
            .nextInt(110), 20 + random.nextInt(110)));

        g.drawString(s, 2, 16);

        // 图象生效
        g.dispose();
        // 输出图象到页面
        ImageIO.write((BufferedImage) image, "JPEG", out);
        out.close();
      } catch (Exception e) {
        e.printStackTrace();
      }
      return null;
    }

    private Color getRandColor(int fc, int bc) { // 给定范围获得随机颜色
      Random random = new Random();
      if (fc > 255)
        fc = 255;
      if (bc > 255)
        bc = 255;
      int r = fc + random.nextInt(bc - fc);
      int g = fc + random.nextInt(bc - fc);
      int b = fc + random.nextInt(bc - fc);
      return new Color(r, g, b);
  }
}

JSP代码: