登录功能 用户名zs 密码123 登录成功
要求 有验证码功能 界面要美观
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML > <html> <head> <title>登录界面</title> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> <style type="text/css"> .contentArea{450px;position:absolute;top:80px;left:250px;height:500px;} </style> </head> <body style="background:url(images/1.jpg)"> <div class="contentArea"> <p style="font-family:黑体;font-size:56;color:yellow"></p> 登录<br/><br/><br/> <form action="dologin.jsp" name="myform" method="post" > 用户名:<input type="text" name="uname"><br/><br/> 密码:<input type="password" name="upwd"><br/> <br/> 验证码:<img src="yanzhengma.jsp"/> <input type="text" name="code"/> <br/><br/> <input type="submit" value="登录"><br/><br/><br/><br/> <a href="register.jsp" >进行注册</a> </form> </div> </body > </html>
yanzhengma.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(); %>
dologin.jsp
<%@ page contentType="image/jpeg" language="java" import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*" pageEncoding="utf-8"%> <% //获取登录的用户名 String name = request.getParameter("uname"); //获取登录密码 String pwd = request.getParameter("upwd"); //判断 if (name.equals("zs") && pwd.equals("123"))//判断字符串是否相等不是等号是eqyals //转发到ok页面 request.getRequestDispatcher("ok.jsp").forward(request,response); else //转发到no页面 request.getRequestDispatcher("login.jsp").forward(request,response); %>