net.jot.captcha.generators
Class JOTSTDCaptchaGenerator

java.lang.Object
  net.jot.captcha.generators.JOTSTDCaptchaGenerator

All Implemented Interfaces:

JOTCaptchaGeneratorInterface

public class JOTSTDCaptchaGenerator
extends java.lang.Object
implements JOTCaptchaGeneratorInterface

My own captcha impl, called "drunk" because of the way the letters look (wavy) Generate 200x60 captcha containing 5 characters characters used are listed in CHARS (others can be confusing) Background of image is white Characters use Random colors We add some random lines of the same color as the characters to the background(1 pixel thick) Characters "size" varies a bit between (scale: 3 to 5) Characters lines thickness vary from 3 to 5 Characters are drown using "wavy" lines (wavyness: 1 to 4) Wavy lines will also have holes in them (sometimes)

Author:

thibautc

Field Summary

static int	BG_LINES
static int	BG_LINES_LENGTH
static int	CHAR_THICKNESS_MAX
static int	CHAR_THICKNESS_MIN
static int	CODE_LENGTH_MAX
static int	CODE_LENGTH_MIN
static int	FG_LINES
static int	FG_LINES_LENGTH
static int	HEIGHT
static int	MAX_CHAR_COLORS
static int	MAX_CHAR_SCALE
static int	MIN_CHAR_COLORS
static int	MIN_CHAR_SCALE
static int	WAVYNESS_MAX
static int	WAVYNESS_MIN
static int	WIDTH

Constructor Summary

JOTSTDCaptchaGenerator()

Method Summary

java.lang.String	getChars() Return a string contatining all the possible chars that can might be in the captcha
java.lang.String	writeToBrowser(JOTAbstractImageWriterInterface writer, javax.servlet.http.HttpServletResponse response) Sends the captchca straight to the browser (sets headers etc..).
java.lang.String	writeToFile(JOTAbstractImageWriterInterface writer, java.io.File imageFile) Creates a captcha image Return captcha code

Methods inherited from class java.lang.Object

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

Field Detail

WIDTH

public static final int WIDTH

See Also:

Constant Field Values

HEIGHT

public static final int HEIGHT

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Constant Field Values

CODE_LENGTH_MIN

public static final int CODE_LENGTH_MIN

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Constant Field Values

CODE_LENGTH_MAX

public static final int CODE_LENGTH_MAX

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Constant Field Values

MIN_CHAR_SCALE

public static final int MIN_CHAR_SCALE

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Constant Field Values

MAX_CHAR_SCALE

public static final int MAX_CHAR_SCALE

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Constant Field Values

MIN_CHAR_COLORS

public static final int MIN_CHAR_COLORS

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Constant Field Values

MAX_CHAR_COLORS

public static final int MAX_CHAR_COLORS

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Constant Field Values

BG_LINES

public static final int BG_LINES

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Constant Field Values

BG_LINES_LENGTH

public static final int BG_LINES_LENGTH

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Constant Field Values

FG_LINES

public static final int FG_LINES

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Constant Field Values

FG_LINES_LENGTH

public static final int FG_LINES_LENGTH

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Constant Field Values

CHAR_THICKNESS_MIN

public static final int CHAR_THICKNESS_MIN

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Constant Field Values

CHAR_THICKNESS_MAX

public static final int CHAR_THICKNESS_MAX

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Constant Field Values

WAVYNESS_MIN

public static final int WAVYNESS_MIN

See Also:

Constant Field Values

WAVYNESS_MAX

public static final int WAVYNESS_MAX

See Also:

Constant Field Values

Constructor Detail

JOTSTDCaptchaGenerator

public JOTSTDCaptchaGenerator()

Method Detail

getChars

public java.lang.String getChars()

Description copied from interface: JOTCaptchaGeneratorInterface

Return a string contatining all the possible chars that can might be in the captcha

Specified by:

getChars in interface JOTCaptchaGeneratorInterface

writeToFile

public java.lang.String writeToFile(JOTAbstractImageWriterInterface writer,
                                    java.io.File imageFile)
                             throws java.lang.Exception

Description copied from interface: JOTCaptchaGeneratorInterface

Creates a captcha image Return captcha code

Specified by:

writeToFile in interface JOTCaptchaGeneratorInterface

Throws:

java.lang.Exception

writeToBrowser

public java.lang.String writeToBrowser(JOTAbstractImageWriterInterface writer,
                                       javax.servlet.http.HttpServletResponse response)
                                throws java.lang.Exception

Description copied from interface: JOTCaptchaGeneratorInterface

Sends the captchca straight to the browser (sets headers etc..). Note that it will close(commit) the response. ex: writeBrowser(writer,responset,"CAPTCHA_CODE"); returns the captcha code.

Specified by:

writeToBrowser in interface JOTCaptchaGeneratorInterface

Throws:

java.lang.Exception