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Jsp页面生成随机验证码图片

2015-10-22 16:47 537 查看

image.jsp生成随机验证码图片的Jsp页面

<%@page contentType="image/jpeg" import="java.awt.*,

java.awt.image.*,java.util.*,javax.imageio.*"%>

<%!

ColorgetRandColor(int fc,int bc)

{

Randomrandom = new Random();

if(fc>255)fc=255;

if(bc>255)bc=255;

intr=fc+random.nextInt(bc-fc);

intg=fc+random.nextInt(bc-fc);

intb=fc+random.nextInt(bc-fc);

returnnew Color(r,g,b);

}

%>

<%

out.clear();//这句针对resin服务器，如果是tomacat可以不要这句

response.setHeader("Pragma","No-cache");

response.setHeader("Cache-Control","no-cache");

response.setDateHeader("Expires",0);

intwidth=60, height=20;

BufferedImageimage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphicsg = image.getGraphics();

Randomrandom = new Random();

g.setColor(getRandColor(200,250));

g.fillRect(0,0, width, height);

g.setFont(newFont("Times New Roman",Font.PLAIN,18));

g.setColor(getRandColor(160,200));

for(int i=0;i<155;i++)

{

intx = random.nextInt(width);

inty = random.nextInt(height);

intxl = random.nextInt(12);

intyl = random.nextInt(12);

g.drawLine(x,y,x+xl,y+yl);

}

StringsRand="";

for(int i=0;i<4;i++){

Stringrand=String.valueOf(random.nextInt(10));

sRand+=rand;

g.setColor(newColor(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));

g.drawString(rand,13*i+6,16);

}

//将认证码存入SESSION

session.setAttribute("rand",sRand);

g.dispose();

ImageIO.write(image,"JPEG", response.getOutputStream());

%>

logic.jsp
登陆页面，在这里提供输入验证码然后提交并验证

<%@page contentType="text/html;charset=gbk" %>

<%@page language="java" import="java.sql.*"errorPage="" %>

<html>

<head>

<metahttp-equiv="Content-Type" content="text/html; charset=gb2312">

<title>用户登录</title>

<scriptlanguage="javascript">

functionloadimage(){

document.getElementById("randImage").src= "image.jsp?"+Math.random();

}

</script>

</head>

<body>

<tablewidth="256" border="0" cellpadding="0"cellspacing="0">



<formaction="validate.jsp" method="post"name="loginForm">

<tr>

<tdwidth="118" height="22" valign="middle"align="center"><input type="text"name="rand" size="15"></td>

<tdwidth="138" valign="middle"align="center"><img alt="code..."name="randImage" id="randImage" src="image.jsp"width="60" height="20" border="1"align="absmiddle"></td>

</tr>

<tr>

<tdheight="36" colspan="2" align="center"valign="middle"><ahref="javascript:loadimage();"><font class=pt95>看不清点我</font></a></td>

</tr>

<tr>

<tdheight="36" colspan="2" align="center"valign="middle"><input type="submit"name="login" value="提交"></td>

</tr>

</form>

</table>

</body>

</html>

validate.jsp用来验证输入的验证码是否正确

<%@page contentType="text/html; charset=gb2312"language="java" import="java.sql.*" errorPage=""%>

<%

Stringrand = (String)session.getAttribute("rand");

Stringinput = request.getParameter("rand");

if(rand.equals(input)){

out.print("<script>alert('验证通过！');</script>");

}else{

out.print("<script>alert('请输入正确的验证码！');location.href='login.jsp';</script>");

}

%>

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