买域名的时候看到的一个验证码，感觉蛮有意思的（https://www.namesilo.com/create_account.php），这个质感看上去就不一样：
查看页面源码，果然这个验证码是用html的标签拼接出来的：
当然这种验证码是比较容易破解的，它是请求这个接口拿到的验证码html数据：
https://www.namesilo.com/captcha_generate.php
返回的数据被url编码了：
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22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3C%2Ftr%3E%3Ctr%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc1%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3Ctd%20class%3D%22capc2%22%20style%3D%22padding%3A0%3B%22%3E%26nbsp%3B%3C%2Ftd%3E%3C%2Ftr%3E%3C%2Ftable%3E
对其url decode并格式化：
<style>.capc1{ background-color: #F8ECFF; } .capc2{ background-color: #030D14; }</style>
<table c ellpadding="0" cellspacing="0" class="captchatable" align="center">
<tr>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td></tr>
<tr>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td></tr>
<tr>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td></tr>
<tr>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td></tr>
<tr>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td></tr>
<tr>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td></tr>
<tr>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc1" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td>
<td class="capc2" style="padding:0;"> </td></tr>
</table>破解的思路很简单，就是从字符映射回图片即可，多找几个例子观察可以看到，class就两个，capc2是背景色块，capc1是字体色块，然后就比较简单了，将这个captcha table的每个单元格作为一个像素映射到一张图片上：
package cc11001100.misc.crawler.captcha.namesilo;
import cc11001100.misc.crawler.utils.HttpUtil;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.apache.commons.io.FileUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.select.Elements;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
/**
* @author CC11001100
*/
public class NamesiloCrawler {
@NoArgsConstructor
@AllArgsConstructor
@Data
public static class Captcha {
private String html;
private BufferedImage img;
}
public static Captcha getCaptcha() {
String url = "https://www.namesilo.com/captcha_generate.php";
String html = HttpUtil.request(url, null, response -> URLDecoder.decode(response.body(), StandardCharsets.UTF_8));
Document doc = Jsoup.parse(html);
Elements rowElt = doc.select(".captchatable tr");
BufferedImage image = new BufferedImage(rowElt.get(0).select("td").size(), rowElt.size(), BufferedImage.TYPE_INT_RGB);
for (int y = 0; y < rowElt.size(); y++) {
Elements colsElt = rowElt.get(y).select("td");
for (int x = 0; x < colsElt.size(); x++) {
boolean isBackground = "capc2".equals(colsElt.get(x).attr("class"));
image.setRGB(x, y, isBackground ? Color.WHITE.getRGB() : Color.BLACK.getRGB());
}
}
return new Captcha(html, image);
}
public static void saveCaptchaForShow() throws IOException {
for (int i = 0; i < 10; i++) {
Captcha captcha = getCaptcha();
BufferedImage image = captcha.getImg();
long ts = System.currentTimeMillis();
ImageIO.write(image, "png", new File("data/captcha/namesilo/" + ts + ".png"));
FileUtils.writeStringToFile(new File("data/captcha/namesilo/" + ts + ".html"), captcha.getHtml(), "UTF-8");
}
}
public static void main(String[] args) throws IOException {
saveCaptchaForShow();
}
}
映射到的图片：
打开保存的html看看映射得是否正确：
接下来的事情就比较简单了，就是最基本的字符型图片验证码破解，因此也不再继续往下演示了。
这种验证码安全性还是比较差的，只是感觉蛮有意思，于是自己实现了一个：
package cc11001100.misc.crawler.captcha.namesilo;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
/**
* @author CC11001100
*/
public class NamesiloCaptcha {
public static boolean[][] draw(String chars, int size) throws IOException {
int width = size * chars.length();
BufferedImage image = new BufferedImage(width, size, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
g.setColor(Color.WHITE);
g.fillRect(0, 0, image.getWidth(), image.getHeight());
g.setColor(Color.BLACK);
g.setFont(new Font("Helvetica", Font.PLAIN, (int) (size * 1.1)));
g.drawString(chars, (int) (chars.length() * size * 0.1), (int) (size * 0.9));
// ImageIO.write(image, "png", new File("data/captcha/namesilo/1.png"));
boolean[][] result = new boolean[size][width];
for (int y = 0; y < image.getHeight(); y++) {
for (int x = 0; x < image.getWidth(); x++) {
result[y][x] = image.getRGB(x, y) == Color.BLACK.getRGB();
// System.out.printf("%-3d", image.getRGB(x, y));
}
// System.out.println();
}
return result;
}
public static void showWith(String chars, int size, char c) throws IOException {
boolean[][] matrix = draw(chars, size);
for (int x = 0; x < matrix.length; x++) {
StringBuilder line = new StringBuilder(matrix[x].length);
for (int y = 0; y < matrix[x].length; y++) {
// char t = !matrix[x][y] ? c : ' ';
char t = matrix[x][y] ? c : ' ';
line.append(t).append(t).append(t);
}
System.out.println(line.toString());
}
}
public static void main(String[] args) throws IOException {
showWith("ABCD", 10, '☻');
}
}
效果：
☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻
☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻
☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻
☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻
☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻
☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻
☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻ ☻☻☻
☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻
或者反色，可能需要离得远一点或者摘下眼镜才能看清楚了：
☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻ ☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻☻
.