单点登录添验证码例子

2012-08-25

单点登录加验证码例子在部署cas登录过程中,可能会用到验证码功能,这里简要介绍一下加入验证码的过程.1.首

单点登录加验证码例子
     在部署cas登录过程中,可能会用到验证码功能,这里简要介绍一下加入验证码的过程.
1.   首先,我用的cas版本是3.4.6,验证码采用的是CAPTCHA,所需jar包可以google搜索,部署好cas后.在web-info目录下找到login-webflow.xml,打开,找到如下代码:
     <view-state id="viewLoginForm" view="casLoginView" model="credentials">
        <var name="credentials" />
        <binder>
            <binding property="username" />
            <binding property="password" />
        </binder>
        <on-entry>
            <set name="viewScope.commandName" value="'credentials'" />
        </on-entry>
<transition on="submit" bind="true" validate="true" to="realSubmit">
            <set name="flowScope.credentials" value="credentials" />
            <evaluate expression="authenticationViaFormAction.doBind(flowRequestContext, flowScope.credentials)" />
        </transition>
</view-state>
此段代码的功能是绑定cas登录过程中的用户名和密码,再次我们修改如下:
      <view-state id="viewLoginForm" view="casLoginView" model="credentials">
        <var name="credentials" />
        <binder>
            <binding property="username" />
            <binding property="password" />
        </binder>
        <on-entry>
            <set name="viewScope.commandName" value="'credentials'" />
        </on-entry>
<transition on="submit" bind="true" validate="true" to="yzmSubmit">
            <set name="flowScope.credentials" value="credentials" />
            <evaluate expression="authenticationViaFormAction.doBind(flowRequestContext, flowScope.credentials)" />
        </transition>
</view-state>
也就是说,只需要修改realSubmit为yzmSubmit即可.然后加入如下配置:
      
<action-state id="yzmSubmit">
        <evaluate expression="yzmViaFormAction.submit(flowRequestContext)" />
<transition on="success" to="realSubmit" />
<transition on="error" to="viewLoginForm" />
</action-state>

此段配置是自定义的验证码验证器,用来验证你提交的验证码的正确性.
2.在web-info下找到cas-servlet.xml,打开后,加入

<bean id="yzmViaFormAction" src="captcha.jpg">
<spring:message code="screen.welcome.label.yzm.accesskey" var="yzmAccessKey" />
<form:input csscssErrorid="yzm" size="25" tabindex="1" accesskey="${yzmAccessKey}" path="yzm" autocomplete="false" htmlEscape="true" />
<%--fan add end --%>
5. 最后一步则是注册验证码生成器,打开web.xml文件,加入
<servlet>
        <servlet-name>jcaptcha</servlet-name>
        <servlet-class>com.ivan.zhang.servlet.ImageCaptchaServlet</servlet-class>
        <load-on-startup>0</load-on-startup>
    </servlet>
<servlet-mapping>
        <servlet-name>jcaptcha</servlet-name>
        <url-pattern>/captcha.jpg</url-pattern>
    </servlet-mapping>
ok,就这么简单.简单解释一下流程,web.xml中注册的类是用来调用自定义的验证码生成器,以便在显示登陆界面的时候绘制验证码图片,并在session中生成标志位并记录,当用户提交验证码和用户名密码时,会先走自定义的验证码验证器(此时会先验证验证码的正确性),如果正确,再走用户名和密码的验证,如果不正确,则直接跳转回登陆页面.yzm.jar是自定义的验证码生成器和验证类,直接打包好后放到web-info/lib下.
如有疑问,请留言
   去掉    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        UsernamePasswordCredentials that = (UsernamePasswordCredentials) o;

        if (password != null ? !password.equals(that.password) : that.password != null) return false;
        if (username != null ? !username.equals(that.username) : that.username != null) return false;
        if (yzm != null ? !yzm.equals(that.yzm) : that.yzm != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = username != null ? username.hashCode() : 0;
        result = 31 * result + (password != null ? password.hashCode() : 0);
        return result;
    }
}
//将这个类替换

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单点登录添验证码例子