/** * @see ------------------------------------------------------------------------------------------------------------------------ * @see CAS登录页添加验证码 * @see 0.这年头验证码一般用来防止帐号被暴力破解,如果我们的系统是走专线的,也就是说放在内网,那完全没必要搞验证码 * @see 1.由于CAS使用了Spring Web Flow框架,所以我们想在表单加属性就直接找\WEB-INF\login-webflow.xml * @see 2.在84行<view-state id="viewLoginForm">中找到表单的两个属性,我们加一个<binding property="captcha"/> * @see 同样该标签中会发现model="credential"配置,所以我们就在该文件找credential对应的实体类配置 * @see 发现是在27行设置的,其值为org.jasig.cas.authentication.UsernamePasswordCredential * @see 这是一个用来接收前台表单参数的JavaBean,我们这里要在表单上加一个参数captcha,所以继承它就行了 * @see 3.创建com.msxf.sso.model.UsernamePasswordCaptchaCredential extends UsernamePasswordCredential * @see 再加上captcha属性,以及captcha对应的setter和getter * @see 再修改login-webflow.xml第27行credential对应实体类为com.msxf.sso.model.UsernamePasswordCaptchaCredential * @see 4.接下来添加校验验证码的流程 * @see 继续看<view-state id="viewLoginForm">,这里我们会发现表单实际的提交等动作是由authenticationViaFormAction处理的 * @see authenticationViaFormAction是被配置在cas-servlet.xml中的第233行 * @see 我们要在原有表单处理逻辑的基础上增加验证码,所以就扩展authenticationViaFormAction * @see 创建com.msxf.sso.authentication.AuthenticationViaCaptchaFormAction extends AuthenticationViaFormAction * @see 在AuthenticationViaCaptchaFormAction中增加一个validateCaptcha()方法用来校验验证码 * @see 然后将cas-servlet.xml中的authenticationViaFormAction改为新扩展的AuthenticationViaCaptchaFormAction * @see 同样login-webflow.xml中的三处authenticationViaFormAction改为新扩展的AuthenticationViaCaptchaFormAction * @see 5.将messages.properties的一些提示文字改为中文 * @see required.username=必须输入帐号 * @see required.password=必须输入密码 * @see required.captcha=必须输入验证码 * @see error.authentication.captcha.bad=验证码不正确 * @see authenticationFailure.AccountNotFoundException=登录失败--帐号不正确 * @see authenticationFailure.FailedLoginException=登录失败--密码不正确 * @see authenticationFailure.UNKNOWN=未知错误 * @see ------------------------------------------------------------------------------------------------------------------------ * @create 2015-7-16 下午7:09:19 * @author 玄玉<http://blog.csdn.net/jadyer> */
下面是login-webflow.xml中的改动部分
<!-- <var name="credential" class="org.jasig.cas.authentication.UsernamePasswordCredential"/> --> <!-- 新加的用于接收前台表单验证码字段captcha的JavaBean --> <var name="credential" class="com.msxf.sso.model.UsernamePasswordCaptchaCredential"/> <view-state id="viewLoginForm" view="casLoginView" model="credential"> <binder> <binding property="username"/> <binding property="password"/> <!-- 前台添加表单添加验证码字段captcha --> <binding property="captcha"/> </binder> <on-entry> <set name="viewScope.commandName" value="'credential'"/> </on-entry> <transition on="submit" bind="true" validate="true" to="validateCaptcha"> <evaluate expression="authenticationViaCaptchaFormAction.doBind(flowRequestContext, flowScope.credential)"/> </transition> </view-state> <!-- 新添加的校验验证码 --> <action-state id="validateCaptcha"> <evaluate expression="authenticationViaCaptchaFormAction.validateCaptcha(flowRequestContext, flowScope.credential, messageContext)"/> <transition on="error" to="generateLoginTicket"/> <transition on="success" to="realSubmit"/> </action-state> <action-state id="realSubmit"> <evaluate expression="authenticationViaCaptchaFormAction.submit(flowRequestContext, flowScope.credential, messageContext)"/> <transition on="warn" to="warn"/> <transition on="success" to="sendTicketGrantingTicket"/> <transition on="successWithWarnings" to="showMessages"/> <transition on="authenticationFailure" to="handleAuthenticationFailure"/> <transition on="error" to="generateLoginTicket"/> </action-state>下面是扩展的UsernamePasswordCaptchaCredential.java
package com.msxf.sso.model; import org.jasig.cas.authentication.UsernamePasswordCredential; /** * 自定义的接收登录验证码的实体类 * @create 2015-7-14 下午4:28:33 * @author 玄玉<http://blog.csdn.net/jadyer> */ public class UsernamePasswordCaptchaCredential extends UsernamePasswordCredential { private static final long serialVersionUID = 8317889802836113837L; private String captcha; public String getCaptcha() { return captcha; } public void setCaptcha(String captcha) { this.captcha = captcha; } }下面是扩展的AuthenticationViaCaptchaFormAction.java
package com.msxf.sso.authentication; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.jasig.cas.authentication.Credential; import org.jasig.cas.web.flow.AuthenticationViaFormAction; import org.jasig.cas.web.support.WebUtils; import org.springframework.binding.message.MessageBuilder; import org.springframework.binding.message.MessageContext; import org.springframework.util.StringUtils; import org.springframework.webflow.execution.RequestContext; import com.msxf.sso.model.UsernamePasswordCaptchaCredential; /** * 自定义的处理验证码登录逻辑的Action * @create 2015-7-14 下午4:28:55 * @author 玄玉<http://blog.csdn.net/jadyer> */ public class AuthenticationViaCaptchaFormAction extends AuthenticationViaFormAction { public final String validateCaptcha(final RequestContext context, final Credential credential, final MessageContext messageContext){ final HttpServletRequest request = WebUtils.getHttpServletRequest(context); HttpSession session = request.getSession(); String rand = (String)session.getAttribute("rand"); session.removeAttribute("rand"); UsernamePasswordCaptchaCredential upc = (UsernamePasswordCaptchaCredential)credential; String captcha = upc.getCaptcha(); System.out.println("获取Session验证码-->" + rand); System.out.println("获取表单输入验证码-->" + captcha); if(!StringUtils.hasText(rand) || !StringUtils.hasText(captcha)){ messageContext.addMessage(new MessageBuilder().error().code("required.captcha").build()); return "error"; } if(captcha.equals(rand)){ return "success"; } //这段网上这么写的messageContext.addMessage(new MessageBuilder().code("required.captcha").build()); //实际上这么写是org.springframework.binding.message.INFO级别的,这会导致前台表单无法显示这里的错误信息 messageContext.addMessage(new MessageBuilder().error().code("error.authentication.captcha.bad").build()); return "error"; } }下面是cas-servlet.xml中的改动部分
<!-- <bean id="authenticationViaFormAction" class="org.jasig.cas.web.flow.AuthenticationViaFormAction" p:centralAuthenticationService-ref="centralAuthenticationService" p:warnCookieGenerator-ref="warnCookieGenerator" p:ticketRegistry-ref="ticketRegistry"/> --> <!-- 新添加的用于校验验证码的Action --> <bean id="authenticationViaCaptchaFormAction" class="com.msxf.sso.authentication.AuthenticationViaCaptchaFormAction" p:centralAuthenticationService-ref="centralAuthenticationService" p:warnCookieGenerator-ref="warnCookieGenerator" p:ticketRegistry-ref="ticketRegistry"/>下面是我的登录页\\WEB-INF\\view\\jsp\\msxf\\ui\\casLoginView.jsp
<%@ page pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%> <c:set var="ctx" value="${pageContext.request.contextPath}" scope="session"/> <!DOCTYPE HTML> <html> <head> <meta charset="UTF-8"/> <title>CAS单点登录系统</title> <link rel="icon" type="image/x-icon" href="${ctx}/favicon.ico"/> <script type="text/javascript" src="${ctx}/js/jquery-1.10.2.min.js"></script> <script type="text/javascript" src="${ctx}/js/jquery-ui-1.10.2.min.js"></script> <script type="text/javascript" src="${ctx}/js/cas.js"></script> <!--[if lt IE 9]> <script src="${ctx}/js/html5shiv-3.7.2.min.js" type="text/javascript"></script> <![endif]--> </head> <style> body {background-color: #CBE0C9;} #msg {padding:20px; margin-bottom:10px;} #msg.errors {border:1px dotted #BB0000; color:#BB0000; padding-left:100px; background:url(${ctx}/images/error.gif) no-repeat 20px center;} </style> <body> <c:if test="${not pageContext.request.secure}"> <div id="msg" class="errors"> <h2>Non-secure Connection</h2> <p>You are currently accessing CAS over a non-secure connection. Single Sign On WILL NOT WORK. In order to have single sign on work, you MUST log in over HTTPS.</p> </div> </c:if> <form:form method="post" commandName="${commandName}" htmlEscape="true"> <!-- cssClass用于指定表单元素CSS样式名,相当于HTML元素的class属性 cssStyle用于指定表单元素样式,相当于HTML元素的style属性 cssErrorClass用于指定表单元素发生错误时对应的样式 path属性用于绑定表单对象的属性值,它支持级联属性,比如path="user.userName"将调用表单对象getUser.getUserName()绑定表单对象的属性值 --> <form:errors path="*" id="msg" cssClass="errors" element="div" htmlEscape="false"/> <input type="hidden" name="lt" value="${loginTicket}"/> <input type="hidden" name="execution" value="${flowExecutionKey}"/> <input type="hidden" name="_eventId" value="submit"/> <table border="9"> <tr> <td> <c:if test="${not empty sessionScope.openIdLocalId}"> <strong>${sessionScope.openIdLocalId}</strong> <input type="hidden" name="username" value="${sessionScope.openIdLocalId}"/> </c:if> <c:if test="${empty sessionScope.openIdLocalId}"> <form:input tabindex="1" path="username" placeholder="帐号" htmlEscape="true" maxlength="16" size="25"/> </c:if> </td> </tr> <tr> <td> <form:password tabindex="2" path="password" placeholder="密码" htmlEscape="true" maxlength="16" size="25"/> </td> </tr> <tr> <td> <form:input tabindex="3" path="captcha" placeholder="验证码" htmlEscape="true" maxlength="4" size="15"/> <img style="cursor:pointer; vertical-align:middle;" src="captcha.jsp" onClick="this.src='captcha.jsp?time'+Math.random();"> </td> </tr> <%-- <tr> <td> <input type="checkbox" tabindex="3" name="warn" value="true"/> <label for="warn">转向其他站点前提示我</label> </td> </tr> --%> <tr> <td> <input type="submit" tabindex="3" value="登录"/> </td> </tr> </table> </form:form> </body> </html>下面是我的登录成功页\\WEB-INF\\view\\jsp\\msxf\\ui\\casGenericSuccess.jsp
<%@ page pageEncoding="UTF-8"%> <body style="background-color:#CBE0C9;"> <span style="color:red; font-size:64px; font-weight:bold;">登录成功</span> </body>最后是用到的用于生成验证码的\\WebRoot\\captcha.jsp
<%@ page contentType="image/jpeg; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="java.awt.Color"%> <%@ page import="java.util.Random"%> <%@ page import="java.awt.image.BufferedImage"%> <%@ page import="java.awt.Graphics"%> <%@ page import="java.awt.Font"%> <%@ page import="javax.imageio.ImageIO"%> <%-- 这是一个用于生成随机验证码图片的JSP文件 这里contentType="image/jpeg"用来告诉容器:该JSP文件的输出格式为图片格式 登录网站时,通常要求输入随机生成的验证码,这是为了防止有些软件会自动生成破解密码 这些验证码一般都是通过图片显示出来的,并且图片上有很多不规则的线条或者图案来干扰,使得软件不容易识别图案上的验证码 --%> <%! /** * 定义验证码类型 * @see 1--纯数字,2--纯汉字 * @see 这里也支持数字和英文字母组合,但考虑到不好辨认,故注释了这部分代码,详见69行 */ int captchaType = 1; /** * 生成给定范围内的随机颜色 */ Color getRandColor(Random random, int fc, int bc){ if(fc>255) fc = 255; if(bc>255) bc = 255; int r = fc + random.nextInt(bc-fc); int g = fc + random.nextInt(bc-fc); int b = fc + random.nextInt(bc-fc); return new Color(r, g, b); } %> <% //设置页面不缓存 response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); //创建随机类实例 Random random = new Random(); //定义图片尺寸 int width=60*this.captchaType, height=(this.captchaType==1)?20:30; //创建内存图像 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); //获取图形上下文 Graphics g = image.getGraphics(); //设定背景色 g.setColor(this.getRandColor(random, 200, 250)); //设定图形的矩形坐标及尺寸 g.fillRect(0, 0, width, height); String sRand = ""; if(this.captchaType == 1){ //图片背景随机产生50条干扰线作为噪点 g.setColor(this.getRandColor(random, 160, 200)); g.setFont(new Font("Times New Roman", Font.PLAIN, 18)); for(int i=0; i<50; i++){ int x11 = random.nextInt(width); int y11 = random.nextInt(height); int x22 = random.nextInt(width); int y22 = random.nextInt(height); g.drawLine(x11, y11, x11+x22, y11+y22); } //取随机产生的4个数字作为验证码 //String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; //String str = "abcdefghkmnpqrstwxyABCDEFGHJKLMNPRSTWXYZ123456789"; for(int i=0; i<4; i++){ //String rand = String.valueOf(str.charAt(random.nextInt(62))); //String rand = String.valueOf(str.charAt(random.nextInt(49))); String rand = String.valueOf(random.nextInt(10)); sRand += rand; g.setColor(this.getRandColor(random, 10, 150)); //将此数字画到图片上 g.drawString(rand, 13*i+6, 16); } }else{ //设定备选汉字 String base = "\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740" + "\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b" + "\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1" + "\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001" + "\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1" + "\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1" + "\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0" + "\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee" + "\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168" + "\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d" + "\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c" + "\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0" + "\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f" + "\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf" + "\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597" + "\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3" + "\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be" + "\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173" + "\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757" + "\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752" + "\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6" + "\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531" + "\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5" + "\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4" + "\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c" + "\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a" + "\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834" + "\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce" + "\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559" + "\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645" + "\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165" + "\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c" + "\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6"; //图片背景增加噪点 g.setColor(this.getRandColor(random, 160, 200)); g.setFont(new Font("Times New Roman", Font.PLAIN, 14)); for(int i=0; i<6; i++){ g.drawString("*********************************************", 0, 5*(i+2)); } //设定验证码汉字的备选字体{"宋体", "新宋体", "黑体", "楷体", "隶书"} String[] fontTypes = {"\u5b8b\u4f53", "\u65b0\u5b8b\u4f53", "\u9ed1\u4f53", "\u6977\u4f53", "\u96b6\u4e66"}; //取随机产生的4个汉字作为验证码 for(int i=0; i<4; i++){ int start = random.nextInt(base.length()); String rand = base.substring(start, start+1); sRand += rand; g.setColor(this.getRandColor(random, 10, 150)); g.setFont(new Font(fontTypes[random.nextInt(fontTypes.length)], Font.BOLD, 18+random.nextInt(4))); //将此汉字画到图片上 g.drawString(rand, 24*i+10+random.nextInt(8), 24); } } //将验证码存入SESSION session.setAttribute("rand", sRand); //图像生效 g.dispose(); //输出图像到页面 ImageIO.write(image, "PNG", response.getOutputStream()); //若无下面两行代码,则每次请求生成验证码图片时,尽管不会影响到图片的生成以及验证码的校验,但控制台都会滚动下面的异常 //java.lang.IllegalStateException: getOutputStream() has already been called for this response out.clear(); out = pageContext.pushBody(); %>
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【试水CAS-4.0.3】第03节_CAS服务端登录页添加验证码
原文地址:http://blog.csdn.net/jadyer/article/details/46916169