在页面中引入标签
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<%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags" %>
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然后：
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<div> username : <sec:authentication property="name"/></div>
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2：如果要在程序中获得
看了网上很多写法都是在程序中写这样的代码
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UserDetails userDetails = (UserDetails) SecurityContextHolder.getContext().getAuthentication() .getPrincipal();
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但我在实际运用中发现获得的Authentication为null。仔细看了下源代码发现，如果想用上面的代码获得当前用户，必须在spring
security过滤器执行中执行，否则在过滤链执行完时org.springframework.security.web.context.SecurityContextPersistenceFilter类会
调用SecurityContextHolder.clearContext();而把SecurityContextHolder清空，所以会得到null。 经过spring security认证后，
security会把一个SecurityContextImpl对象存储到session中，此对象中有当前用户的各种资料
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SecurityContextImpl securityContextImpl = (SecurityContextImpl) request
.getSession().getAttribute("SPRING_SECURITY_CONTEXT");
// 登录名
System.out.println("Username:"
+ securityContextImpl.getAuthentication().getName());
// 登录密码，未加密的
System.out.println("Credentials:"
+ securityContextImpl.getAuthentication().getCredentials());
WebAuthenticationDetails details = (WebAuthenticationDetails) securityContextImpl
.getAuthentication().getDetails();
// 获得访问地址
System.out.println("RemoteAddress" + details.getRemoteAddress());
// 获得sessionid
System.out.println("SessionId" + details.getSessionId());
// 获得当前用户所拥有的权限
List<GrantedAuthority> authorities = (List<GrantedAuthority>) securityContextImpl
.getAuthentication().getAuthorities();
for (GrantedAuthority grantedAuthority : authorities) {
System.out.println("Authority" + grantedAuthority.getAuthority());
}
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原文：http://www.cnblogs.com/yanduanduan/p/5159289.html