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{width: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);
%>