开源验证码生成工具（nkaptcha for Java）

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nkaptcha是一款用于Java的验证码库，它不依赖于其他库，易于设置和使用，具有高可用性和高性能。用户可以轻松地更改验证码图片的样式，支持自定义扭曲代码。

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开源地址：https://github.com/shuaijunlan/nkaptcha

nkaptcha

nkaptcha is a verification code library for Java, it doesn’t rely on any other libraries, is very easy to setup and use, is high availability and high performance . If you would like to change the style of the verification code image, there is several configuration options and the framework is modular so you can write your own morphing code.

If you have a valid issue with the functionality or design of nkaptcha, please click the Issues page and file one.

Verification Code

Features

Installation

Buid by maven:

<repositories>
    <repository>
        <id>shuaijunlan-github-maven-repository</id>
        <name>shuaijunlan-github-maven-repository</name>
        <url>https://raw.githubusercontent.com/shuaijunlan/shuaijunlan.github.io/master</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <artifactId>nkaptcha</artifactId>
        <groupId>io.github.shuaijunlan</groupId>
        <version>1.0.0</version>
    </dependency>
</dependencies>

Get Started

You can generate verification code picture like this:

Output to folder by default properties

VerificationList verificationList = new VerificationList();
BufferedImage bufferedImage = verificationList.pop().getBufferedImage();
String formatName = "jpg";
String pathName = "F:\\test\\" + System.currentTimeMillis() + ".jpg";
ImageIO.write(bufferedImage,
        formatName,
        new File(pathName));

In web application by default properties

@GetMapping("nkaptcha")
public void nkaptcha(HttpServletResponse httpServletResponse) throws IOException {
    VerificationList verificationList = new VerificationList(properties);
    String formatName = "jpg";
    ImageIO.write(verificationList.pop().getBufferedImage(),
            formatName,
            httpServletResponse.getOutputStream());
}

Also you can change the properties by yourself

Properties properties = new Properties();
properties.setProperty(ParamKeyConstants.NKAPTCHA_IMAGE_NOISE_LINE, "true");
properties.setProperty(ParamKeyConstants.NKAPTCHA_IMAGE_NOISE_POINT, "false");
properties.setProperty(ParamKeyConstants.NKAPTCHA_IMAGE_NOISE_LINE_COUNT, "10");
VerificationList verificationList = new VerificationList(properties);
BufferedImage bufferedImage = verificationList.pop().getBufferedImage();
String formatName = "jpg";
ImageIO.write(verificationList.pop().getBufferedImage(),
              formatName,
              httpServletResponse.getOutputStream());