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  • 3.28第四周作业

    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <body>
    <div class="container">
        <div class="row">
            <div class="col-md-4">
    
            </div>
            <div class="col-md-4">
                <form class="form-signin" method="post" action="login-check.jsp">
                    <label for="">用户名</label>
                    <input type="text" name="username" id="username" class="form-control" placeholder="请输入用户名" required autofocus><br>
                    <label for="">密码</label>
                    <input type="password" name="password" id="password" class="form-control" placeholder="请输入密码" required>
                    <label for="">验证码</label>
                    <img src="number.jsp">
                        <input type="text" name="verificationCode" id="code" required>
                        <div class="checkbox">
                    </div>
                    <button type="submit" class="btn btn-primary" id="btn-login">登录</button>
                </form>
            </div>
            <div class="col-md-4">
            </div>
        </div>
    </div>
    </body>
    </html>
    <%@ page contentType="text/html; charset=utf-8" language="java"%>
    <html>
    <h1>登录成功!</h1>
    </html>
    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <%!
        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
        ImageIO.write(image,"JPEG",response.getOutputStream());
        out.clear();
        out = pageContext.pushBody();
    %>

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  • 原文地址:https://www.cnblogs.com/jiming123/p/14589739.html
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