• 第四次


    index.jsp

    <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    <%@ page contentType="text/html" %>
    <%@ page import="java.util.regex.Pattern" %>
    <%@ page import="java.util.regex.Matcher" %>
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <body >
        <form action="login.jsp" method="post">
              用户名:<input type="text" name="name" value=""><br>
              密码:<input type="password" name="pwd"><br>
              验证码:<img src="Code.jsp"/>
                 <input type="text" name="code"/>
            <input type="submit" name="login" value="登录"><br>
        </form>
    </body>
    </html>

    Code.jsp 

    <%@ page contentType="image/jpeg" language="java" import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*" 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();
    %>

    login.jsp  

    //验证码<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
    <%
        //获取登录的用户名
        String name = request.getParameter("name");
        //获取登录密码
        String pwd = request.getParameter("pwd");
        //判断
      
        if (name.equals("zzs") && pwd.equals("123456"))
            //转发到ok页面
            request.getRequestDispatcher("Login-successful.jsp").forward(request,response);
        else
            //转发到no页面
            request.getRequestDispatcher("Login-failed.jsp").forward(request,response);
    %>

    login-successful  

    <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
     
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <base href="<%=basePath%>">
         
        <title>My JSP 'Login-successful.jsp' starting page</title>
         
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">   
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">
        <!--
        <link rel="stylesheet" type="text/css" href="styles.css">
        -->
     
      </head>
       
      <body>
        Login successful <br>
      </body>
    </html>

    login-failed   

    <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <base href="<%=basePath%>">
        
        <title>My JSP 'Login-failed.jsp' starting page</title>
        
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">    
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">
        <!--
        <link rel="stylesheet" type="text/css" href="styles.css">
        -->
    
      </head>
      
      <body>
        Login failed <br>
      </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/qyling/p/14591998.html
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