Kaptcha组件的使用步骤:
1、下载Kaptcha-2.3.jar
下载地址:https://mvnrepository.com/artifact/com.google.code.kaptcha/kaptcha/2.3
2、将jar包导入web项目中
3、编写页面(index.jsp)
源代码:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Kaptcha验证码</title>
</head>
<body>
<form action="<%=request.getContextPath()%>/loginServlet" method="post">
请输入验证码:<input name="piccode" type="text" />
<img alt="验证码" src="<%=request.getContextPath()%>/piccode.jpg" /><br />
<input type="submit" value="登录" />
</form>
</body>
</html>
4、配置web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>kaptcha</display-name>
<servlet>
<servlet-name>kaptcha</servlet-name>
<servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>
<init-param>
<description>
图片边框,合法值:yes,no
</description>
<param-name>kaptcha.border</param-name>
<param-value>no</param-value>
</init-param>
<init-param>
<description>字体颜色,合法值:white,black,blue.等</description>
<param-name>kaptcha.textproducer.font.color </param-name>
<param-value>blue</param-value>
</init-param>
</servlet>
<servlet>
<servlet-name>loginServlet</servlet-name>
<servlet-class>login.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>kaptcha</servlet-name>
<url-pattern>/piccode.jpg</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>loginServlet</servlet-name>
<url-pattern>/loginServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
5、Kaptcha组件详细配置:
Kaptcha图片边框配置
<init-param>
<description>
图片边框,合法值:yes,no
</description>
<param-name>kaptcha.border</param-name>
<param-value>yes</param-value>
</init-param>
Kaptcha图片边框颜色
<init-param>
<description>
边框颜色,合法值:white,black,blue.等
</description>
<param-name>Kaptcha.border.color</param-name>
<param-value>black</param-value>
</init-param>
Kaptcha图片边框厚度
<init-param>
<description>
边框厚度,合法值:0
</description>
<param-name>kaptcha.border.thickness</param-name>
<param-value>1</param-value>
</init-param>
Kaptcha图片边框宽度
<init-param>
<description>图片宽度</description>
<param-name>kaptcha.image.width </param-name>
<param-value>200</param-value>
</init-param>
Kaptcha图片边框高度
<init-param>
<description>图片高度</description>
<param-name>kaptcha.image.height </param-name>
<param-value>50</param-value>
</init-param>
Kaptcha图片实现类
<init-param>
<description>图片实现类</description>
<param-name>kaptcha.producer.impl </param-name>
<param-value>com.google.code.kaptcha.impl.DefaultKaptcha</param-value>
</init-param>
Kaptcha文本实现类
<init-param>
<description>文本实现类</description>
<param-name>kaptcha.textproducer.impl </param-name>
<param-value>com.google.code.kaptcha.text.impl.DefaultTextCreator</param-value>
</init-param>
Kaptcha验证码值配置
<init-param>
<description>文本集合,验证码值从此集合中获取</description>
<param-name>kaptcha.textproducer.char.string </param-name>
<param-value>abcde2345678gfynmnpwx</param-value>
</init-param>
Kaptcha验证码字体配置
<init-param>
<description>字体Arial,Courier</description>
<param-name>kaptcha.textproducer.font.names </param-name>
<param-value>Arial,Courier</param-value>
</init-param>
Kaptcha验证码字体大小配置
<init-param>
<description>字体大小40px.</description>
<param-name>kaptcha.textproducer.font.size </param-name>
<param-value>40</param-value>
</init-param>
Kaptcha验证码字体颜色配置
<init-param>
<description>字体颜色,合法值:white,black,blue.等</description>
<param-name>kaptcha.textproducer.font.color </param-name>
<param-value>black</param-value>
</init-param>
Kaptcha验证码文字间隔配置
<init-param>
<description>文字间隔2</description>
<param-name>kaptcha.textproducer.char.space </param-name>
<param-value>2</param-value>
</init-param>
Kaptcha验证码干扰实现类配置
<init-param>
<description>干扰实现类</description>
<param-name>kaptcha.noise.impl </param-name>
<param-value>com.google.code.kaptcha.impl.DefaultNoise</param-value>
</init-param>
Kaptcha验证码干扰颜色配置
<init-param>
<description>干扰颜色,合法值:r,g,b或者white,black,blue</description>
<param-name>kaptcha.noise.color</param-name>
<param-value>black</param-value>
</init-param>
Kaptcha验证码图片样式配置
<init-param>
<description>图片样式:水纹,鱼眼,阴影</description>
<param-name>kaptcha.obscurificator.impl</param-name>
<param-value>com.google.code.kaptchaimpl.WaterPipple</param-value>
</init-param>
Kaptcha验证码背景实现类配置
<init-param>
<description>背景实现类</description>
<param-name>kaptcha.background.impl </param-name>
<param-value>com.google.code.kaptcha.impl.DefaultBackground</param-value>
</init-param>
Kaptcha验证码背景渐-开始颜色配置
<init-param>
<description>背景颜色渐变,开始颜色</description>
<param-name>kaptcha.background.clear.from</param-name>
<param-value>green</param-value>
</init-param>
Kaptcha验证码背景渐-结束颜色配置
<init-param>
<description>背景颜色渐变,结束 </description>
<param-name>kaptcha.background.clear.to</param-name>
<param-value>white</param-value>
</init-param>
Kaptcha验证码文字渲染器配置
<init-param>
<description>文字渲染器</description>
<param-name>kaptcha.word.impl</param-name>
<param-value>com.google.code.kaptcha.text.impl.DefaultWordRenderer</param-value>
</init-param>
Kaptcha验证码在session中存放验证码的key键配置
<init-param>
<description>session中存放验证码的key键</description>
<param-name>kaptcha.session.key</param-name>
<param-value>KAPTCHA_SESSION_KEY</param-value>
</init-param>
6、启动项目