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<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <form action="login.jsp" method="post"> 用户名: <input type="text" name="uname"/><br/> 密码: <input type="password" name="upwd"/><br/> 验证码: <img src="number.jsp"/> <input type="text" name="code"/> <input type="submit" value="登录"/> </form> </body> </html>
<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %> <!DOCTYPE html> <html> <head> </head> <body> <% request.setCharacterEncoding("utf-8"); String name = request.getParameter("uname"); String pwd = request.getParameter("upwd"); String incode = (String)request.getParameter("code"); String rightcode = (String)session.getAttribute("rCode"); if (name.equals("zs") && pwd.equals("123")&&incode.equals(rightcode)) { request.getRequestDispatcher("b.jsp") .forward(request, response); } else { request.getRequestDispatcher("index.jsp").forward(request, response); } %> </body> </html>
<%@ page import="java.awt.*" %> <%@ page import="java.util.Random" %> <%@ page import="java.awt.image.BufferedImage" %> <%@ page import="javax.imageio.ImageIO" %><%-- Created by IntelliJ IDEA. User: 你有时好傻 Date: 2021/3/27 Time: 19:23 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%! 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); } %> <% //设置页面不缓存 response.setHeader("Pragma","no-cache"); response.setHeader("Cache-Control","no-catch"); response.setDateHeader("Expires",0); //在内存中创建图象 int width = 60; int height = 20; BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); //创建图象 Graphics g = image.getGraphics(); //生成随机对象 Random random = new Random(); //设置背景色 g.setColor(getRandColor(200,250)); g.fillRect(0,0,width,height); //设置字体 g.setFont(new Font("Tines Nev Roman",Font.PLAIN,18)); //随机产生干扰线 g.setColor(getRandColor(160,200)); for(int i = 0; i < 255; i++){ int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt(12); int yl = random.nextInt(12); } //随机产生认证码,4位数字 String sRand = ""; for(int i = 0; i < 4; i++){ String rand = String.valueOf(random.nextInt(10)); sRand += rand; //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(rand,13*i+6,16); } session.setAttribute("rCode",sRand); //图像生效 g.dispose(); //输出图像到页面 response.setContentType("image/jpeg"); ImageIO.write(image,"JPEG",response.getOutputStream()); out.clear(); out = pageContext.pushBody(); %>