java自动生成验证码插件-kaptcha

1

<

form

action

=

"submit.action"

>

2

<

img

src

=

"kaptcha.jpg"

/>
<

input

type

=

"text"

name

=

"kaptcha"

value

=

""

/>

3

</

form

>

1

<

servlet

>

2

<

servlet-name

>Kaptcha</

servlet-name

>

3

<

servlet-class

>com.google.code.kaptcha.servlet.KaptchaServlet</

servlet-class

>

4

</

servlet

>

5

<

servlet-mapping

>

6

<

servlet-name

>Kaptcha</

servlet-name

>

7

<

url-pattern

>/kaptcha.jpg</

url-pattern

>

8

</

servlet-mapping

>

1

String
kaptchaExpected = (String)request.getSession()

2

.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);

3

String
kaptchaReceived = request.getParameter(

"kaptcha"

);

4

5

if

(kaptchaReceived
==

null

||
!kaptchaReceived.equalsIgnoreCase(kaptchaExpected))

6

{

7

setError(

"kaptcha"

,

"Invalid
validation code."

);

8

}

1

<

img

src

=

"/kaptcha"

width

=

"200"

id

=

"kaptchaImage"

/>

2

<

script

type

=

"text/javascript"

>

3

$(function(){

4

$('#kaptchaImage').click(function
() {

5

$(this).attr('src',
'/kaptcha.jpg?' + Math.floor(Math.random()*100) );

6

})

7

});

8

</

script

>

9

<

br

/><

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