Kaptcha组件实现验证码

一、生成验证码

1.导入jar包

2.写页面

3.写验证

4.配置web.xml

二、详细配置

  1 <init-param>
  2             <description>图片边框，合法值：yes , no</description>
  3             <param-name>kaptcha.border</param-name>
  4             <param-value>yes</param-value>
  5         </init-param>
  6         <init-param>
  7             <description>
  8                 边框颜色，合法值： r,g,b (and optional alpha) 或者
  9                 white,black,blue.
 10             </description>
 11             <param-name>kaptcha.border.color</param-name>
 12             <param-value>black</param-value>
 13         </init-param>
 14         <init-param>
 15             <description>边框厚度，合法值：>0</description>
 16             <param-name>kaptcha.border.thickness</param-name>
 17             <param-value>1</param-value>
 18         </init-param>
 19         <init-param>
 20             <description>图片宽 200</description>
 21             <param-name>kaptcha.image.width</param-name>
 22             <param-value>200</param-value>
 23         </init-param>
 24         <init-param>
 25             <description>图片高 50</description>
 26             <param-name>kaptcha.image.height</param-name>
 27             <param-value>50</param-value>
 28         </init-param>
 29         <init-param>
 30             <description>图片实现类</description>
 31             <param-name>kaptcha.producer.impl</param-name>
 32             <param-value>
 33                 com.google.code.kaptcha.impl.DefaultKaptcha
 34             </param-value>
 35         </init-param>
 36         <init-param>
 37             <description>文本实现类</description>
 38             <param-name>kaptcha.textproducer.impl</param-name>
 39             <param-value>
 40                 com.google.code.kaptcha.text.impl.DefaultTextCreator
 41             </param-value>
 42         </init-param>
 43         <init-param>
 44             <description>文本集合，验证码值从此集合中获取</description>
 45             <param-name>kaptcha.textproducer.char.string</param-name>
 46             <param-value>1234567890</param-value>
 47         </init-param>
 48         <init-param>
 49             <description>验证码长度 5</description>
 50             <param-name>kaptcha.textproducer.char.length</param-name>
 51             <param-value>2</param-value>
 52         </init-param>
 53         <init-param>
 54             <description>字体 Arial, Courier</description>
 55             <param-name>kaptcha.textproducer.font.names</param-name>
 56             <param-value>Arial, Courier</param-value>
 57         </init-param>
 58         <init-param>
 59             <description>字体大小 40px.</description>
 60             <param-name>kaptcha.textproducer.font.size</param-name>
 61             <param-value>40</param-value>
 62         </init-param>
 63         <init-param>
 64             <description>
 65                 字体颜色，合法值： r,g,b 或者 white,black,blue.
 66             </description>
 67             <param-name>kaptcha.textproducer.font.color</param-name>
 68             <param-value>black</param-value>
 69         </init-param>
 70         <init-param>
 71             <description>文字间隔 2</description>
 72             <param-name>kaptcha.textproducer.char.space</param-name>
 73             <param-value>2</param-value>
 74         </init-param>
 75         <init-param>
 76             <description>干扰实现类</description>
 77             <param-name>kaptcha.noise.impl</param-name>
 78             <param-value>
 79                 <!-- com.google.code.kaptcha.impl.NoNoise -->
 80                 com.google.code.kaptcha.impl.DefaultNoise
 81             </param-value>
 82         </init-param>
 83         <init-param>
 84             <description>
 85                 干扰颜色，合法值： r,g,b 或者 white,black,blue.
 86             </description>
 87             <param-name>kaptcha.noise.color</param-name>
 88             <param-value>black</param-value>
 89         </init-param>
 90         <init-param>
 91             <description>
 92                 图片样式： 水纹com.google.code.kaptcha.impl.WaterRipple
 93                 鱼眼com.google.code.kaptcha.impl.FishEyeGimpy
 94                 阴影com.google.code.kaptcha.impl.ShadowGimpy
 95             </description>
 96             <param-name>kaptcha.obscurificator.impl</param-name>
 97             <param-value>
 98                 com.google.code.kaptcha.impl.WaterRipple
 99             </param-value>
100         </init-param>
101         <init-param>
102             <description>背景实现类</description>
103             <param-name>kaptcha.background.impl</param-name>
104             <param-value>
105                 com.google.code.kaptcha.impl.DefaultBackground
106             </param-value>
107         </init-param>
108         <init-param>
109             <description>背景颜色渐变，开始颜色</description>
110             <param-name>kaptcha.background.clear.from</param-name>
111             <param-value>green</param-value>
112         </init-param>
113         <init-param>
114             <description>背景颜色渐变，结束颜色</description>
115             <param-name>kaptcha.background.clear.to</param-name>
116             <param-value>white</param-value>
117         </init-param>
118         <init-param>
119             <description>文字渲染器</description>
120             <param-name>kaptcha.word.impl</param-name>
121             <param-value>
122                 com.google.code.kaptcha.text.impl.DefaultWordRenderer
123             </param-value>
124         </init-param>
125         <init-param>
126             <description>
127                 session中存放验证码的key键
128             </description>
129             <param-name>kaptcha.session.key</param-name>
130             <param-value>KAPTCHA_SESSION_KEY</param-value>
131         </init-param>
132         <init-param>
133             <description>
134                 The date the kaptcha is generated is put into the
135                 HttpSession. This is the key value for that item in the
136                 session.
137             </description>
138             <param-name>kaptcha.session.date</param-name>
139             <param-value>KAPTCHA_SESSION_DATE</param-value>
140         </init-param>

三、算式验证码的实现——>重写KapthaServlet类

1. 获取随机值，结果相加

2.将计算公式写到验证码图片中

3.将相加结果放在session中

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原文地址：https://www.cnblogs.com/olivegyr/p/7402861.html