spring security获得当前不为空的上下文

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()); }