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java实例 验证码机制

(1)登陆页面前台html部分代码

<script src="https://code.csdn.net/snippets/590081.js" type="text/javascript"></script>

(2)web.xml配置sevlet调用入口

<script src="https://code.csdn.net/snippets/590082.js" type="text/javascript"></script>

(3)sevlet生成验证码,存入session,返回前台

<script src="https://code.csdn.net/snippets/590084.js" type="text/javascript"></script>


(4)后台校验验证码
<script src="https://code.csdn.net/snippets/590095.js" type="text/javascript"></script>

(5)如果验证码错误,或者看不清楚,局部刷新验证码
<script src="https://code.csdn.net/snippets/590088.js" type="text/javascript"></script>




java实例 验证码机制