自定义简单验证码

发布于 2024-11-04 05:19:32 字数 542 浏览 0 评论 0原文

我们使用 SimpleCaptcha http://simplecaptcha.sourceforge.net/ 在注册表单中创建验证码（在Tomcat上运行）

我们使用以下命令创建验证码：

Captcha captcha = new Captcha.Builder(300, 57).build();

验证码显示如下：在此处输入图像描述

但是当我向验证码添加更多选项时，例如 Captcha captcha = new Captcha.Builder( 300, 57).addNoise().build();，仍然以同样的方式显示，没有噪音。我尝试了更多选项，但仍然得到相同的结果。

有谁知道为什么会发生这种情况？

谢谢，

库尔特

原文

We're using SimpleCaptcha http://simplecaptcha.sourceforge.net/ to creating a captcha in our registration form (running on Tomcat)

We create the captcha using:

Captcha captcha = new Captcha.Builder(300, 57).build();

and the captcha is displayed as follows:
enter image description here

But when I add more options to the captcha such as Captcha captcha = new Captcha.Builder(300, 57).addNoise().build();, it's still displayed in the same way without the noise. I tried more options but still get the same results.

Does anyone know why this is happening please?

Thanks,

Kurt

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玩套路吗 2024-11-11 05:19:32

我尝试了上面的代码（使用 java 1.6 版本），但它没有产生任何结果。原因是你没有 .addText()。（我本想将此写为评论，但我对此没有足够的声誉）。这对我来说表明您上面的代码不是您的实际代码，也许您在发布时忘记了某些内容。

这是我使用的有效方法：

public class MyCaptchaServlet extends SimpleCaptchaServlet
{
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException
    {
        Captcha captcha = new Captcha.Builder(120,40).addText().addBorder().gimp().addBackground(new GradiatedBackgroundProducer()).build();

        CaptchaServletUtil.writeImage(response, captcha.getImage());

        request.getSession().setAttribute(Captcha.NAME, captcha);
    }
}

在 .build() 之前添加 .addNoise() 确实会显示噪音。

I tried the code above (with java 1.6 version) and it produces nothing. The reason is that you don't have .addText(). (I would have written this as a comment but I don't have enough reputation for it). This suggests to me that your code above isn't your actual code, maybe you forgot something when posting.

Here's what I use that works:

public class MyCaptchaServlet extends SimpleCaptchaServlet
{
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException
    {
        Captcha captcha = new Captcha.Builder(120,40).addText().addBorder().gimp().addBackground(new GradiatedBackgroundProducer()).build();

        CaptchaServletUtil.writeImage(response, captcha.getImage());

        request.getSession().setAttribute(Captcha.NAME, captcha);
    }
}

Adding .addNoise() just before .build() does show the noise.

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