Original Essay] The powerful Google open source free verification code reCAPTCHA
1, first visit http://code.google.com/intl/zh-CN/apis/recaptcha/intro.html, then click the corresponding language on the left, bloggers use the example jsp, so to download the jar package, you can directly [click here to download the jar package] to decompress the recaptcha4j-0.0.7.jar in the zip to the web project lib.
2. Visit https://www.google.com/recaptcha/admin/create and log in with your google account, enter the URL of your website in the text box, such as global-key.mycompany.com, click create key to generate Public Key and Private Key.
3. Write an example form in jsp
<%@ page import="net.tanesha.recaptcha.ReCaptcha" %> <%@ page import="net.tanesha.recaptcha.ReCaptchaFactory" %> <html> <body> <form action="" method="post"> <% ReCaptcha c = ReCaptchaFactory.newReCaptcha("fill in the previously generated public_key", "fill in the previously generated private_key", false); out.print(c.createRecaptchaHtml(null, null)); %> <
4，编写示例服务端接收校验
<%@ page import="net.tanesha.recaptcha.ReCaptchaImpl" %> <%@ page import="net.tanesha.recaptcha.ReCaptchaResponse" %> <html> <body> <% String remoteAddr = request.getRemoteAddr(); ReCaptchaImpl reCaptcha = new ReCaptchaImpl(); reCaptcha.setPrivateKey("填入之前生成的private_key"); String challenge = request.getParameter("recaptcha_challenge_field"); String uresponse = request.getParameter("recaptcha_response_field"); ReCaptchaResponse reCaptchaResponse = reCaptcha.checkAnswer(remoteAddr, challenge, uresponse); if (reCaptchaResponse.isValid()) { out.print("Answer was entered correctly!"); } else { out.print("Answer is wrong"); } %> </body> </html>
Google verification code
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