利用kaptcha实现验证码,防止表单重复提交
一、添加kaptcha的依赖<dependency><groupId>com.github.penggle</groupId><artifactId>kaptcha</artifactId><version>2.3.2</version></dependency>二、在web.x...
·
一、添加kaptcha的依赖
<dependency>
<groupId>com.github.penggle</groupId>
<artifactId>kaptcha</artifactId>
<version>2.3.2</version>
</dependency>
二、在web.xml中添加kaptcha的servlet
<servlet>
<!-- 生成图片的Servlet -->
<servlet-name>Kaptcha</servlet-name>
<servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>
<!-- 是否有边框 -->
<init-param>
<param-name>kaptcha.border</param-name>
<param-value>no</param-value>
</init-param>
<!-- 字体颜色 -->
<init-param>
<param-name>kaptcha.textproducer.font.color</param-name>
<param-value>red</param-value>
</init-param>
<!-- 图片宽度 -->
<init-param>
<param-name>kaptcha.image.width</param-name>
<param-value>135</param-value>
</init-param>
<!-- 使用哪些字符生成验证码 -->
<init-param>
<param-name>kaptcha.textproducer.char.string</param-name>
<param-value>ACDEFHKPRSTWX345679</param-value>
</init-param>
<!-- 图片高度 -->
<init-param>
<param-name>kaptcha.image.height</param-name>
<param-value>50</param-value>
</init-param>
<!-- 字体大小 -->
<init-param>
<param-name>kaptcha.textproducer.font.size</param-name>
<param-value>43</param-value>
</init-param>
<!-- 干扰线的颜色 -->
<init-param>
<param-name>kaptcha.noise.color</param-name>
<param-value>black</param-value>
</init-param>
<!-- 字符个数 -->
<init-param>
<param-name>kaptcha.textproducer.char.length</param-name>
<param-value>4</param-value>
</init-param>
<!-- 使用哪些字体 -->
<init-param>
<param-name>kaptcha.textproducer.font.names</param-name>
<param-value>Arial</param-value>
</init-param>
</servlet>
<!-- 映射的url -->
<servlet-mapping>
<servlet-name>Kaptcha</servlet-name>
<url-pattern>/Kaptcha</url-pattern>
</servlet-mapping>
三、在你表单需要的地方添加相应的html代码
更换验证码的src根据自己的项目来设置
<!-- 验证码 kaptcha控件 -->
<li>
<div class="item-content">
<div class="item-inner">
<div class="item-title label">验证码</div>
<input type="text" id="j_captcha" placeholder="验证码">
<div class="item-input">
<img id="capcha_img" alt="点击更换" title="点击更换"
onclick="changeVerifyCode(this)" src="../../../Kaptcha" />
</div>
</div>
</div>
</li>
四、在后台接收输入框内的数据判断验证码是否正确
代码中接收前端传来的数据verifyCodeActual可以根据自己的方式接收,verifyCodeActual根据前端的参数名字来写
public static boolean checkVerifyCode(HttpServletRequest request) {
String verifyCodeExpected = (String) request.getSession().getAttribute(
com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);
String verifyCodeActual = HttpServletRequestUtil.getString(request,
"verifyCodeActual");
if (verifyCodeActual == null
|| !verifyCodeActual.equalsIgnoreCase(verifyCodeExpected)) {
return false;
}
return true;
}
verifyCodeExpected是验证码的值,verifyCodeActual是接收的值
更多推荐
已为社区贡献1条内容
所有评论(0)