1.在session中取得spring security的登录用户名如下：
${session.SPRING_SECURITY_CONTEXT.authentication.principal.username}
spring security 把SPRING_SECURITY_CONTEXT 放入了session 没有直接把username 放进去。下面一段代码主要描述的是session中的存的变量，

存跳转时候的URLsession
{SPRING_SECURITY_SAVED_REQUEST_KEY=SavedRequest[http://localhost:8080/AVerPortal/resourceAction/resourceIndex.action]}
存的是登录成功时候session中存的信息：

session {SPRING_SECURITY_CONTEXT=org.springframework.security.context.SecurityContextImpl@87b16984: Authentication: org.springframework.security.providers.cas.CasAuthenticationToken@87b16984: Principal: com.avi.casExtends.UserInfo@ff631d80: Username: test; Password: [PROTECTED]; Enabled: true; AccountNonExpired: true; credentialsNonExpired: true; AccountNonLocked: true; Granted Authorities: ROLE_ADMIN; Password: [PROTECTED]; Authenticated: true; Details: org.springframework.security.ui.WebAuthenticationDetails@12afc: RemoteIpAddress: 127.0.0.1; SessionId: AE56E8925195DFF4C50ABD384574CCEA; Granted Authorities: ROLE_ADMIN Assertion: org.jasig.cas.client.validation.AssertionImpl@661a11 Credentials (Service/Proxy Ticket): ST-3-1lX3acgZ6HNgmhvjXuxB-cas, userId=2, userName=test}

2.在页面端用tag获取：
<%@ taglib prefix='security' uri='http://www.springframework.org/security/tags'%>
<security:authentication property="principal.username"></security:authentication>
或者
<security:authorize ifAllGranted="ROLE_ADMIN">
<security:authentication property="principal.username"></security:authentication>
</security:authorize>
或者取session中的值：

${session.SPRING_SECURITY_CONTEXT.authentication.principal.username}
3.在后台获取

UserDetails userDetails = (UserDetails) SecurityContextHolder.getContext()
.getAuthentication()
.getPrincipal();

userDetails.getUsername()

如果想要获取更多的信息：得扩展userDetails的默认实现类user类和UserDetailsService接口

由于springsecurity是把整个user信息放入session中的即：session.SPRING_SECURITY_CONTEXT.authentication.principal。这个就是代表着user对象。

http://blog.csdn.net/zmx729618/article/details/51914836

6.1 th:text属性
可对表达式或变量求值，并将结果显示在其被包含的 html 标签体内替换原有html文本
文本连接：用“+”符号，若是变量表达式也可以用“|”符号
6.2 th:utext属性
e.g.
若home.welcome=Welcome to our <b>fantastic</b> grocery store!
用<p th:text="#{home.welcome}"></p>解析结果为：
<p>Welcome to our <b>fantastic</b> grocery store!</p>
解决方案
<p th:utext="#{home.welcome}"></p>即可。
等效于<p>Welcome to our <b>fantastic</b> grocery store!</p>

<div>

        <ol>

        <li>文本：

            <ol>

                <li>'xxxx':Now you are looking at a <span th:text="'working web application'">template file</span>.</li>

                <li>不能有空格、逗号：Now you are looking at a <span th:text="workingwebapplication">template file</span>.</li>

            </ol>

        </li>

        <li>数字：

            <ol>

                <li>The year is <span th:text="2014">1492</span>.</li>

                <li>In two years, it will be <span th:text="2014 + 2">1494</span>.</li>

            </ol>

        </li>

        <li>布尔值(true/false)：

            <ol>

                <li>获取对象属性：<span th:if="${user.isAdmin} == false"> ...</span></li>

                <li>获取对象的方法(public)：<span th:if="${user.isAdmin()} == false"> ...</span></li>

            </ol>

        </li>

        <li>null:<span th:if="${user.isAdmin()} == null"> ...</span></li>

        <li>连接：

            <ol>

                <li>连接符+：<span th:text="'The name of the user is ' + ${user.userName}"></span></li>

                <li>连接符|：<span th:text="|Welcome to our application, ${user.userName}!|"></span></li>

                <li><span th:text="'Welcome to our application, ' + ${user.userName} + '!'"></span></li>

                <li><span th:text="${onevar} + ' ' + |${twovar}, ${threevar}|"></span></li>

                <li><span th:utext="#{home.welcome}">Welcome to our grocery store!</span></li>

            </ol>

        </li>

        <li>th:utext：

            <ol>

                <li>th:text：<span th:text="${textWelcome}">textWelcome!</span></li>

                <li>th:utext：<span th:utext="${textWelcome}">textWelcome!</span></li>

            </ol>

        </li>

        </ol>

    </div>  

http://blog.csdn.net/sun_jy2011/article/details/40215101