Class ImageCaptchaGenerator

java.lang.Object

cloud.opencode.base.captcha.generator.AbstractCaptchaGenerator

cloud.opencode.base.captcha.generator.ImageCaptchaGenerator

All Implemented Interfaces:

CaptchaGenerator

public final class ImageCaptchaGenerator
extends AbstractCaptchaGenerator
implements CaptchaGenerator

Image Captcha Generator - Generates static image CAPTCHA 图像验证码生成器 - 生成静态图像验证码

This generator creates standard image-based CAPTCHAs with text.

此生成器创建带文本的标准图像验证码。

Features | 主要功能:

• Static image CAPTCHA generation - 静态图像验证码生成
• Multiple type support (alphanumeric, numeric, alpha) - 多种类型支持（字母数字、纯数字、纯字母）
• Random font per character for anti-OCR - 每字符随机字体抗OCR
• Character overlap for anti-segmentation - 字符重叠抗分割
• Outline shadow for anti-OCR - 轮廓阴影抗OCR
• Bezier noise through character area - 贝塞尔穿字噪声
• Sine wave warp distortion - 正弦波变形扭曲

Usage Examples | 使用示例:

CaptchaGenerator gen = new ImageCaptchaGenerator(CaptchaType.ALPHANUMERIC);
Captcha captcha = gen.generate(config);

Security | 安全性:

• Thread-safe: Yes (immutable after construction) - 线程安全: 是（构造后不可变）
• Null-safe: No (config must not be null) - 空值安全: 否（配置不能为null）

Since:

JDK 25, opencode-base-captcha V1.0.3

Author:

Leon Soo www.LeonSoo.com

See Also:

• OpenCode.cloud

Constructor Summary

Constructors

Constructor	Description
ImageCaptchaGenerator(CaptchaType type)	Creates a new generator with the specified type.

Method Summary

Modifier and Type	Method	Description
Captcha	generate(CaptchaConfig config)	Generates a CAPTCHA with the specified configuration.
CaptchaType	getType()	Gets the supported CAPTCHA type.

Methods inherited from class AbstractCaptchaGenerator

buildCaptcha, createGraphics, createImage, createMetadata, drawNoise, generateId, toBytes

Methods inherited from class Object

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

Methods inherited from interface CaptchaGenerator

generate

Constructor Details

ImageCaptchaGenerator

public ImageCaptchaGenerator(CaptchaType type)

Creates a new generator with the specified type. 使用指定类型创建新生成器。

Parameters:

type - the CAPTCHA type | 验证码类型

Method Details

generate

public Captcha generate(CaptchaConfig config)

Description copied from interface: CaptchaGenerator

Generates a CAPTCHA with the specified configuration. 使用指定配置生成验证码。

Specified by:

generate in interface CaptchaGenerator

Parameters:

config - the configuration | 配置

Returns:

the generated CAPTCHA | 生成的验证码

getType

public CaptchaType getType()

Description copied from interface: CaptchaGenerator

Gets the supported CAPTCHA type. 获取支持的验证码类型。

Specified by:

getType in interface CaptchaGenerator

Returns:

the CAPTCHA type | 验证码类型