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Jcaptcha is an open source Java Open Source component used to generate graphical verification code, which is very easy to use.
JCAPTHCA is very powerful, not only can generate picture-type verification code, but also can generate sound (Sina used a two-factor verification code).
Jcaptcha is a relatively famous project in Captcha.
1: First add the jar package that needs to be used
Note: As part of the jar package Maven Central Library does not need to add itself to the local library, the jar package
The following is the configuration of the jar package in the Pom.xml file
<dependency> <groupId>Commons-collections</groupId> <artifactid>Commons-collections</artifactid> <version>3.0</version> </Dependency> <dependency> <groupId>Commons-logging</groupId> <artifactid>Commons-logging</artifactid> <version>1.1.3</version> </Dependency> <dependency> <groupId>Com.octo.captcha</groupId> <artifactid>Filters</artifactid> <version>2.0.235</version> </Dependency> <dependency> <groupId>Com.octo.captcha</groupId> <artifactid>Jcaptcha-api</artifactid> <version>1.0</version> </Dependency> <dependency> <groupId>Com.octo.captcha</groupId> <artifactid>Jcaptcha</artifactid> <version>2.0-alpha-1-snapshot</version> </Dependency> <dependency> <groupId>Com.octo.captcha</groupId> <artifactid>Jcaptcha-integration-simple-servlet</artifactid> <version>2.0-alpha-1-snapshot</version> </Dependency> <dependency> <groupId>Javax.servlet</groupId> <artifactid>Servlet-api</artifactid> <version>2.4</version> <scope>Provided</Scope> </Dependency>Configuration of the servlet in the Web. xml file, refer to the following address
Https://jcaptcha.atlassian.net/wiki/display/general/Simple+Servlet+Integration+documentation
<! DOCTYPE Web-app Public "-//sun Microsystems, INC.//DTD Web Application 2.3//en" "Http://java.sun.com/dtd/web-app_2_3. DTD "><web-app> <display-name>Verifycode</display-name> <servlet> <servlet-name>Verifycode</servlet-name> <servlet-class>Com.niu.gao.VerifyCodeServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>Verifycode</servlet-name> <url-pattern>/verifycode/submit.do</url-pattern> </servlet-mapping> <!--jcaptcha configuration https://jcaptcha.atlassian.net/wiki/display/general/Simple+Servlet+Integration+ Documentation -- <servlet> <servlet-name>Jcaptcha</servlet-name> <servlet-class>Com.octo.captcha.module.servlet.image.SimpleImageCaptchaServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>Jcaptcha</servlet-name> <url-pattern>/jcaptcha.jpg</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list></Web-app>index.jsp page
<%@ page language="java" import="java.util.*" 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" ><html> <head> <base href="<%=basePath%>"> <title>Verifycode</title> <meta http-equiv="Pragma" content="No-cache"> <meta http-equiv="Cache-control" content="No-cache" > <meta http-equiv="Expires" content="0"> <meta http-equiv="keywords" content="Keyword1,keyword2,keyword3" > <meta http-equiv="description" content="This is my page" > <script type="text/javascript" src="Jquery-1.9.1.js" ></script> <script type="Text/javascript"> var path="<%=path%>"; $ (document). Ready (function() { $ (' #codeImg '). On ("click",
function
(){ $ (
' #codeImg '). Prop (
' src ', path+
'/jcaptch A.jpg?nocache= '+
new
Date(). GetTime ()); }); });
</script> </head><body Style="Text-align:center;" ><h2>Hello world!</H2><span style="margin:10px 0 0 10px;vertical-align:baseline;" >Please enter a verification code:<input name="Verifycode" type="text" /></span><img id="codeimg" style="vertical-align:bottom;margin:10px 0 0 10px;cursor:pointer; " alt="captcha" src="<%=path%>/jcaptcha.jpg"> </body></html>Validating the Servlet class
PackageCom.niu.gao;ImportJava.awt.Color;ImportJava.awt.Font;ImportJava.awt.Graphics;ImportJava.awt.image.BufferedImage;ImportJava.io.IOException;ImportJava.util.Random;ImportJavax.imageio.ImageIO;ImportJavax.servlet.ServletException;ImportJavax.servlet.http.HttpServlet;ImportJavax.servlet.http.HttpServletRequest;ImportJavax.servlet.http.HttpServletResponse;ImportCom.octo.captcha.module.servlet.image.SimpleImageCaptchaServlet;/** * @Description: (Verification code servlet) * @author: Relieved * @date: 2015-7-25 */ Public class verifycodeservlet extends httpservlet { /** * Serialversionuid * * Private Static Final LongSerialversionuid =1L@Override protected void Doget(HttpServletRequest req, HttpServletResponse resp)throwsServletexception, IOException {String codevalue = Req.getparameter ("Verifycode");BooleanCheckrs = Simpleimagecaptchaservlet.validateresponse (req, codevalue); Resp.setcharacterencoding ("GBK"); Resp.setcontenttype ("Text/html"); Resp.getwriter (). Write (");if(CHECKRS) {resp.getwriter (). Write ("verified success!"); }Else{resp.getwriter (). Write ("validation failed!"); } resp.getwriter (). Write ("<br/><a href= ' Javascript:history.go (-1); ' > Try again </a> "); Resp.getwriter (). Write ("</body>); }@Override protected void DoPost(HttpServletRequest req, HttpServletResponse resp)throwsServletexception, IOException { This. Doget (req, resp); }}
Validation failure diagram
Verify through Diagram
Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.
Verification code for simple MAVEN Web project (Jcaptcha component)
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