��Z��struts的验证码实现

涧墨 — Wed, 28 May 2008 13:51:00 GMT

——本文摘至互联网—�?br />
产生4个验证码的ACTION�Q?/font>

————ValidateCodeAction.java———�?/font>

package org.struts.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.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.commons.lang.RandomStringUtils;

public class ValidateCodeAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response) {
  try {
   int width = 52;
   int height = 22;
   // 取得一�?位随机字母数字字�W�串
   String code = RandomStringUtils.random(4, true, true);

   // 保存入session,用于与用��L��输入�q�行比较.
   // 注意比较完之后清除session.
   HttpSession session = request.getSession(true);
   session.setAttribute("code", code);

   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();
   // 讑֮�背景�?br />   g.setColor(getRandColor(200, 250));
   g.fillRect(0, 0, width, height);

   // 讑֮�字体
   Font mFont = new Font("Times New Roman", Font.BOLD, 18);// 讄��字体
   g.setFont(mFont);

   // 画边�?br />   // g.setColor(Color.BLACK);
   // g.drawRect(0, 0, width - 1, height - 1);

   // 随机产生�q�扰�U�，使图象中的认证码不易被其它程序探��到
   g.setColor(getRandColor(160, 200));
   // 生成随机�c?br />   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);
   }

   // ��认证码昄��到图象中
   g.setColor(new Color(20 + random.nextInt(110), 20 + random
     .nextInt(110), 20 + random.nextInt(110)));

   g.drawString(code, 2, 16);

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

private Color getRandColor(int fc, int bc) { // �l�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);
}

}

struts-config.xml中配�|�：



JSP中调用的�Ҏ��Q?/font>

    onclick="this.src.value='/ValidateCode.do'"
    alt="误��入此验证码，如看不清��L��d��新�? style="cursor: pointer"/>

涧墨 2008-05-28 21:51 发表评论

日韩国产综合,国内偷自视频区视频综合,av2020不卡

��Z��struts的验证码实现