nl.captcha
Class Captcha

java.lang.Object
  nl.captcha.Captcha

All Implemented Interfaces:

java.io.Serializable

public final class Captcha
extends java.lang.Object
implements java.io.Serializable

A builder for generating a CAPTCHA image/answer pair.

Example for generating a new CAPTCHA:

Captcha captcha = new Captcha.Builder(200, 50)
        .addText()
        .addBackground()
        .build();

Note that the build() must always be called last. Other methods are optional, and can sometimes be repeated. For example:

Captcha captcha = new Captcha.Builder(200, 50)
        .addText()
        .addNoise()
        .addNoise()
        .addNoise()
        .addBackground()
        .build();

Adding multiple backgrounds has no affect; the last background added will simply be the one that is eventually rendered.

To validate that answerStr is a correct answer to the CAPTCHA:

captcha.isCorrect(answerStr);

Author:

James Childers

See Also:

Serialized Form

Nested Class Summary

static class

Captcha.Builder

Field Summary

static java.lang.String

NAME

Method Summary

java.lang.String	getAnswer()
java.awt.image.BufferedImage	getImage() Get the CAPTCHA image, a PNG.
java.util.Date	getTimeStamp()
boolean	isCorrect(java.lang.String answer)
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

NAME

public static final java.lang.String NAME

See Also:

Constant Field Values

Method Detail

isCorrect

public boolean isCorrect(java.lang.String answer)

getAnswer

public java.lang.String getAnswer()

getImage

public java.awt.image.BufferedImage getImage()

Get the CAPTCHA image, a PNG.

Returns:

A PNG CAPTCHA image.

getTimeStamp

public java.util.Date getTimeStamp()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object