5.Spring security从当前请求对象中获取登陆用户

@RequestMapping("getUser")

public void getUser(HttpServletRequest req){

　　String remoteUser=req.getRemoteUser();

　　Authentication auth=(Authentication) req.getUserPrincipal();

　　System.out.println("remoteUser:"+remoteUser);

　　System.out.println("auth.getName():"+auth.getName());

}