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jsp页面包含验证码（含有代码）

2015-04-02 19:50 274 查看

login.jsp登录页面

<%@ 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 'login.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">



</head>

<%

String incode = (String)request.getParameter("code");

String rightcode = (String)session.getAttribute("rCode");

if(incode != null && rightcode != null){

if(incode.equals(rightcode)){

out.println("验证码输入正确！");

}else{

out.println("验证码输入不正确，请重新输入！");

}

}

%>

<body>

<form action="login.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"/>

<input type="submit" value="登录"/>

</form>

</body>

</html>

code.jsp页面，实现验证码生成

<%@ 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();

%>

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