单点登录CAS4-服务端登录页添加验证码

1、由于CAS使用了SpringWebFlow，所以我们想在登录页表单中增加属性就直接找\WEB-INF\login-webflow.xml

2、在第84行<view-state id="viewLoginForm">中找到表单的两个属性，我们加一个

　　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

　　发现是在第27行设置的，其值为org.jasig.cas.authentication.UsernamePasswordCredential

　　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

3、创建com.jadyer.sso.model.UsernamePasswordCaptchaCredential extends UsernamePasswordCredential

　　再加上captcha属性，及其对应的setter和getter

　　再修改login-webflow.xml第27行credential对应实体类为com.jadyer.sso.model.UsernamePasswordCaptchaCredential

4、接下来添加校验验证码的流程

　　继续看，这里我们会发现表单实际的提交等动作是由authenticationViaFormAction处理的

　　authenticationViaFormAction是被配置在cas-servlet.xml中的第233行

　　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

　　创建com.jadyer.sso.authentication.AuthenticationViaCaptchaFormAction extends AuthenticationViaFormAction

　　在AuthenticationViaCaptchaFormAction中增加一个validateCaptcha()方法用来校验验证码

　　然后将cas-servlet.xml中的authenticationViaFormAction改为新扩展的AuthenticationViaCaptchaFormAction

        注意名字不需要修改，只修改class地址  <bean id="authenticationViaFormAction"                          class="com.jadyer.sso.authentication.AuthenticationViaCaptchaFormAction" ..../>   血淋淋的坑，不要踩下去哦！

　　　同样login-webflow.xml中的三处authenticationViaFormAction改为新扩展的AuthenticationViaCaptchaFormAction资料上需要这样更改，但是我在做的时候这样做并没有什么作用，就先写在这里，做参考吧，本人不介意更改此项内容。

5、最后把messages.properties的一些提示文字改为中文

　　required.username=必须输入帐号

　　required.password=必须输入密码

　　required.captcha=必须输入验证码

　　error.authentication.captcha.bad=验证码不正确

　　authenticationFailure.AccountNotFoundException=登录失败–帐号不正确

　　authenticationFailure.FailedLoginException=登录失败–密码不正确

　　authenticationFailure.UNKNOWN=未知错误

代码

本文源码下载：（下面两个地址的文件的内容，都是一样的）

http://oirr30q6q.bkt.clouddn.com/jadyer/code/sso-cas-login-captcha.rar

http://download.csdn.net/detail/jadyer/8906831

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.jadyer.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.jadyer.sso.model;import org.jasig.cas.authentication.UsernamePasswordCredential;/** * 自定义的接收登录验证码的实体类 * Created by 玄玉<https://jadyer.github.io/> on 2015/07/14 16:28. */public class UsernamePasswordCaptchaCredential extends UsernamePasswordCredential {    private static final long serialVersionUID = 8317889802836113837L;    private String captcha;    /*-- setter和getter略 --*/}

下面是扩展的AuthenticationViaCaptchaFormAction.java

package com.jadyer.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.jadyer.sso.model.UsernamePasswordCaptchaCredential;/** * 自定义的处理验证码登录逻辑的Action * Created by 玄玉<https://jadyer.github.io/> on 2015/07/14 16:28. */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.jadyer.sso.authentication.AuthenticationViaCaptchaFormAction"        p:centralAuthenticationService-ref="centralAuthenticationService"        p:warnCookieGenerator-ref="warnCookieGenerator"        p:ticketRegistry-ref="ticketRegistry"/>

下面是我的登录成功页\WEB-INF\view\jsp\jadyer\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>

下面是我的登录页\WEB-INF\view\jsp\jadyer\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>

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（1--纯数字，2--纯汉字） * 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，详见第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SESSIONsession.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 responseout.clear();out = pageContext.pushBody();%>