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开发工具:eclipse、kaptcha-2.3.jar包。
一、创建Web项目;
二、新建一个Jsp页面(内容有,一个文本框,一个图片容器,一个提交按钮)
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三、可以看出图片验证码来源(src=“randomcode.jpg”)需配置Web.xml文件。(交给Servlet(该servlet在kaptcha-2.3.jar)处理)
<servlet><servlet-name>Kaptcha</servlet-name><servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class></servlet><servlet-mapping><servlet-name>Kaptcha</servlet-name><url-pattern>/randomcode.jpg</url-pattern></servlet-mapping>
四、由于需要kaptcha-2.3.jar包,所以将下载好的jar包导入在lib中。(复制黏贴即可)
其他:
一、网页验证码的属性
(一)添加边框
<servlet><init-param><description>图片边框,合法值:yes , no</description><param-name>kaptcha.border</param-name><param-value>yes</param-value> <!-- yes 或者 no--> </init-param></servlet>
(二)边框颜色
<init-param><description> 边框颜色,合法值: r,g,b (and optional alpha) 或者white,black,blue. </description><param-name>kaptcha.border.color</param-name><param-value>black</param-value></init-param>
(三)边框厚度
<init-param><description>边框厚度,合法值:>大于0 </description><param-name>kaptcha.border.thickness</param-name><param-value>1</param-value></init-param>
(四)图片宽度
<init-param><description>图片宽 200</description><param-name>kaptcha.image.width</param-name><param-value>200</param-value></init-param>
(五)图片高度
<init-param><description>图片高 50</description><param-name>kaptcha.image.height</param-name><param-value>50</param-value></init-param>
(六)验证码集合
<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>1234567890</param-value> <!--纯数字 --> //<param-value>abcde2345678gfynmnpwx</param-value> <!-- 文字加英文--> </init-param>
(七)验证码长度
<init-param><description>验证码长度 默认是5 </description><param-name>kaptcha.textproducer.char.length</param-name><param-value>2</param-value></init-param>
(八)字体
<init-param><description>字体 Arial, Courier</description><param-name>kaptcha.textproducer.font.names</param-name><param-value>Arial, Courier</param-value></init-param>
(九)字体大小
<init-param><description>字体大小 40px.</description><param-name>kaptcha.textproducer.font.size</param-name><param-value>40</param-value></init-param>
(十)字体颜色
<init-param><description> 字体颜色,合法值: r,g,b 或者 white,black,blue. </description><param-name>kaptcha.textproducer.font.color</param-name><param-value>black</param-value></init-param>
(十一)每个验证码之间的间隔
<init-param><description>文字间隔 2</description><param-name>kaptcha.textproducer.char.space</param-name><param-value>2</param-value></init-param>
(十二)干扰实现
<init-param><description>干扰实现类</description><param-name>kaptcha.noise.impl</param-name><param-value><!-- com.google.code.kaptcha.impl.NoNoise --> com.google.code.kaptcha.impl.DefaultNoise </param-value></init-param>
(十三)干扰颜色
<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>
(十四)背景样式
<init-param><description> 图片样式: 水纹com.google.code.kaptcha.impl.WaterRipple 鱼眼com.google.code.kaptcha.impl.FishEyeGimpy 阴影com.google.code.kaptcha.impl.ShadowGimpy </description><param-name>kaptcha.obscurificator.impl</param-name><param-value> com.google.code.kaptcha.impl.WaterRipple </param-value></init-param>
(十五)背景实现类
<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>
(十六)背景渐变颜色
<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><init-param><description>背景颜色渐变,结束颜色</description><param-name>kaptcha.background.clear.to</param-name><param-value>white</param-value></init-param>
(十七)文字渲染器
<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>
(十八)图片的验证码会保存在Session中,其中的值为
<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>
(十九)图片实现类别
<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>
(二十)文本实现类(可通过重写该类来实现验证码为中文)
<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>
重写文本实现类,实现验证码为中文:
1.创建一个类别,继承Configurable 实现TextProducer(在jar包中)
import com.google.code.kaptcha.text.TextProducer; import com.google.code.kaptcha.util.Configurable; import java.util.Random; public class ChineseText extends Configurable implements TextProducer { public String getText() { int length = getConfig().getTextProducerCharLength(); String finalWord = "", firstWord = ""; int tempInt = 0; String[] array = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; Random rand = new Random(); for (int i = 0; i <p>2.修改Web.xml配置</p><pre class="brush:xml;toolbar:false;"><init-param><description>文本实现类</description><param-name>kaptcha.textproducer.impl</param-name><param-value> ChineseText </param-value></init-param> 五、验证码的校验(本文是利用check.jsp来校验的)保存在Session中,其中的键值为(第十八个属性) [html] view plain copy
六、扩展(加法验证码的实现)
1.重写KaptchaServlet类
import com.google.code.kaptcha.Producer; import com.google.code.kaptcha.util.Config; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Enumeration; import java.util.Properties; import javax.imageio.ImageIO; import javax.servlet.Servlet; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class KaptchaServlet extends HttpServlet implements Servlet { private Properties props; private Producer kaptchaProducer; private String sessionKeyValue; public KaptchaServlet() { this.props = new Properties(); this.kaptchaProducer = null; this.sessionKeyValue = null; } public void init(ServletConfig conf) throws ServletException { super.init(conf); ImageIO.setUseCache(false); Enumeration initParams = conf.getInitParameterNames(); while (initParams.hasMoreElements()) { String key = (String) initParams.nextElement(); String value = conf.getInitParameter(key); this.props.put(key, value); } Config config = new Config(this.props); this.kaptchaProducer = config.getProducerImpl(); this.sessionKeyValue = config.getSessionKey(); } public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setDateHeader("Expires", 0L); resp.setHeader("Cache-Control", "no-store, no-cache, must-revalidate"); resp.addHeader("Cache-Control", "post-check=0, pre-check=0"); resp.setHeader("Pragma", "no-cache"); resp.setContentType("image/jpeg"); String capText = this.kaptchaProducer.createText(); String s1 = capText.substring(0, 1); String s2 = capText.substring(1, 2); int r = Integer.valueOf(s1).intValue() + Integer.valueOf(s2).intValue(); req.getSession().setAttribute(this.sessionKeyValue, String.valueOf(r)); BufferedImage bi = this.kaptchaProducer.createImage(s1+"+"+s2+"=?"); ServletOutputStream out = resp.getOutputStream(); ImageIO.write(bi, "jpg", out); try { out.flush(); } finally { out.close(); } } }
2.修改配置文件
<servlet><servlet-name>Kaptcha</servlet-name><servlet-class>KaptchaServlet</servlet-class></servlet>
以上所述是小编给大家介绍的使用开源工具制作网页验证码的方法,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对PHP中文网的支持!
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