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网站如何嵌入验证码
最近博客园的改版动作比较大，看到后台管理页面的验证码，提起了我的兴趣。点击显示的验证码，可以进入到一个专门做验证码的网站：http://captcha.com/
其中包含有java、php、.net等，几乎是全平台支持的，还有配套的教程和demo。
文末提供下载下来的java版的文件，里面有jar包，如何使用呢？想快速入手：
一：最简单的文字验证码。使用jsp方式。
在jsp页面引用：
<%@page import="botdetect.web.Captcha"%>
然后在需要验证码的地方加上:
<% // Adding BotDetect Captcha to the pageCaptcha captcha = Captcha.load(request, "exampleCaptcha"); captcha.renderCaptchaMarkup(pageContext.getServletContext(), pageContext.getOut());%><input id="captchaCodeTextBox" type="text" name="captchaCodeTextBox" />
检测用户输入的验证码是否正确
<%if("POST".equalsIgnoreCase(request.getMethod())){ // validate the Captcha to check we‘re not dealing with a bot boolean isHuman = captcha.validate(request, request.getParameter("captchaCodeTextBox")); if(isHuman){ // TODO: Captcha validation passed, perform protected action } else { // TODO: Captcha validation failed, show error message }}%>
既然引入了第三方jar包，当然少不了在web.xml中配置了。
<servlet-name>BotDetect Captcha</servlet-name> <servlet-class>botdetect.web.http.CaptchaServlet</servlet-class></servlet><servlet-mapping> <servlet-name>BotDetect Captcha</servlet-name> <url-pattern>/botdetectcaptcha</url-pattern></servlet-mapping>
二：使用SpringMVC方式。
对应的页面：
<%@page contentType="text/html" pageEncoding="UTF-8"%><%@taglib prefix="botDetect" uri="botDetect"%><!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>BotDetect CAPTCHA Spring MVC Basic Example</title> <link rel="stylesheet" href="http://www.mamicode.com/stylesheet.css" type="text/css"/> </head> <body> <form method="post"> <h1>BotDetect CAPTCHA Spring MVC Basic Example</h1> <fieldset> <legend>CAPTCHA Validation</legend> <label for="captchaCodeTextBox" class="prompt"> Retype the code from the picture:</label> <!-- Adding BotDetect Captcha to the page --> <botDetect:captcha id="basicExampleCaptcha"/> <div class="validationDiv"> <input id="captchaCodeTextBox" type="text" name="captchaCodeTextBox" value="${basicExample.captchaCodeTextBox}"/> <input type="submit" name="submit" value="http://www.mamicode.com/Submit" /> <span class="correct">${basicExample.captchaCodeCorrect}</span> <span class="incorrect">${basicExample.captchaCodeIncorrect}</span> </div> </fieldset> </form> </body></html>
页面对应的controller：
package botdetect.examples.springmvc.basic.controller;import botdetect.examples.springmvc.basic.model.BasicExample;import botdetect.web.Captcha;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.validation.BindException;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.SimpleFormController;public class IndexController extends SimpleFormController { public IndexController(){ setCommandClass(BasicExample.class); } @Override protected ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors){ BasicExample basicExample = (BasicExample)command; // validate the Captcha to check we‘re not dealing with a bot Captcha captcha = Captcha.load(request, "basicExampleCaptcha"); boolean isHuman = captcha.validate(request, basicExample.getCaptchaCodeTextBox()); if (isHuman) { basicExample.setCaptchaCodeCorrect("Correct."); basicExample.setCaptchaCodeIncorrect(""); } else { basicExample.setCaptchaCodeCorrect(""); basicExample.setCaptchaCodeIncorrect("Incorrect!"); } basicExample.setCaptchaCodeTextBox(""); return new ModelAndView("index", "basicExample", basicExample); } }
验证码对应的bean
package botdetect.examples.springmvc.basic.model;public class BasicExample { private String userCaptchaCode, captchaCodeCorrect, captchaCodeIncorrect; public String getCaptchaCodeTextBox() { return userCaptchaCode; } public void setCaptchaCodeTextBox(String userCaptchaCode) { this.userCaptchaCode = userCaptchaCode; } public String getCaptchaCodeCorrect() { return captchaCodeCorrect; } public void setCaptchaCodeCorrect(String captchaCodeCorrect) { this.captchaCodeCorrect = captchaCodeCorrect; } public String getCaptchaCodeIncorrect() { return captchaCodeIncorrect; } public void setCaptchaCodeIncorrect(String captchaCodeIncorrect) { this.captchaCodeIncorrect = captchaCodeIncorrect; }}
下载验证码文件：
http://captcha.com/botdetect-java-captcha-component-free.zip
网站如何嵌入验证码
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