Java实现登录验证码验证

来源：互联网发布：使用端口命令 tcp 编辑：程序博客网时间：2024/05/01 11:02
<span style="font-size:14px;">package com.visec.mall.vipUser.servlet;import java.io.IOException;   import javax.servlet.ServletException;   import javax.servlet.http.HttpServlet;   import javax.servlet.http.HttpServletRequest;   import javax.servlet.http.HttpServletResponse;   import javax.servlet.http.HttpSession;   import java.util.*;   import java.awt.*;   import java.awt.image.*;   import javax.imageio.*;/*** * 生成验证码 * @author visec、Dana */public class CheckCodeServlet extends HttpServlet {   private static final long serialVersionUID = 1L;   /**   * @see HttpServlet#HttpServlet()   */   public CheckCodeServlet() {   super();   }   /**   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)  */   protected void doGet(HttpServletRequest request,   HttpServletResponse response) throws ServletException, IOException {   response.setContentType("image/jpeg");   response.setHeader("Pragma", "No-cache");   response.setHeader("Cache-Control", "no-cache");   response.setDateHeader("Expires", 0);   HttpSession session = request.getSession();   //BufferedImage生成验证图片属性  int width = 75, height = 25;   BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);   //Graphics画图Graphics g = image.getGraphics();   //生成随机数   Random random = new Random();   //设置验证码背景颜色  g.setColor(getRandColor(200, 250));   g.fillRect(0, 0, width, height);   //设置字体样式g.setFont(new Font("Times New Roman", Font.PLAIN, 24));   //设置 字体颜色g.setColor(getRandColor(160, 200));   g.drawRect(0, 0, width - 1, height - 1);   //产生随机数g.setColor(getRandColor(160, 200));   for (int i = 0; i < 155; 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);   }   String sRand = "";   for (int i = 0; i < 4; i++) {   String rand = String.valueOf(random.nextInt(10));   sRand += rand;   g.setColor(new Color(20 + random.nextInt(110), 20 + random   .nextInt(110), 20 + random.nextInt(110)));   g.drawString(rand, 13 * i + 14, 20);   }   //设置Sessionsession.setAttribute("checkCode", sRand);   //释放资源   g.dispose();   //生成图片ImageIO.write(image, "JPEG", response.getOutputStream());   }   /**   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse   *      response)   */   protected void doPost(HttpServletRequest request,   HttpServletResponse response) throws ServletException, IOException {   // TODO Auto-generated method stub   }   Color getRandColor(int fc, int bc) {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);   }   }</span>
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