spring security中当前用户信息

  1：如果在jsp页面中获取可以使用spring security的标签库

       在页面中引入标签

 

 

1	<%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags" %>

 

     然后：

 

 

1	<div> username : <sec:authentication property="name"/></div>

 

    即可显示当前用户。 

 

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

 

 

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

 

     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()); }