jsp第六次作业

 首页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
  </head>

  <body>
  <form action="dologin.jsp" method="post" >
    用户名:  <input type="text" name="username"/>
    <br>
    密码:      <input type="password"  name="password"/>
       <br>
    验证码：<img src="code.jsp"/>
         	 <input type="text" name="code"/>
    <br>
    <input type="submit" value="登录">
  </form>
  </body>
</html>
　　

　　登录验证

<%@ page import="java.sql.*" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title></title>
</head>
<body>
<%
    String uname = request.getParameter("username");
    String upwd = request.getParameter("password");
    String inputVcode = request.getParameter("inputVcode").toLowedrCase();
    String realInputVcode =(String) session.getAttribute("codes");

    String realUname="";
    String reaslPassword = "";

    Class.forName("com.mysql.jdbc.Driver");

    Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/jsp","root","123456");

    PreparedStatement preparedStatement =connection.prepareStatement("SELECT * FROM word6 where username = ?");
    preparedStatement.setString(1,uname);


    ResultSet rs = null;
    try {
        rs = preparedStatement.executeQuery();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    //如果有数据，rs.next()返回true
    while(rs.next()){
       realUname = rs.getString("username");
       reaslPassword = rs.getString("password");
    }

    if(uname.equals(realUname)&&upwd.equals(reaslPassword)&&inputVcode.equals(inputVcode)){
        HttpSession httpSession = request.getSession();
        httpSession.setAttribute("username",uname);
        httpSession.setAttribute("password",upwd);
        response.sendRedirect("welcome.jsp");
    }else {
        response.sendRedirect("login-failed.jsp");
    }
%>
</body>
</html>

　　验证码

<%@ 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();
%>

登录成功页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
 
</head>
<body>
 
<%
    String name = (String) request.getSession().getAttribute("uname");
%>

<body  style="background:url(images/1.jpg)">
  <div class="contentArea">
   <h1 style="color: red">欢迎<%=name%>登陆！</h1>
</html>

　　登陆失败页面

<%@ 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 'index.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">
    -->
    <style type="text/css"> 
    .contentArea{width:450px;position:absolute;top:150px;left:250px;height:500px;} 
    </style> 
  </head>
  
  <body  style="background:url(images/1.jpg)">
   <div class="contentArea">
  <h1 style="color: red" >登录失败</h1>
  <h2>点击重新<a href="index.jsp">登录</a></h2>
  
   </div>
   
  </body>
</html>

　　

 

 

 

 

 

 登录失败时页面

 

 

 

 点击重新登录跳回登录页面

posted @ 2021-04-12 14:36  我吐啦  阅读(39)  评论(0)    收藏  举报