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