如何从servlet / jsp获取登录属性

可通过

HttpServletRequest#getUserPrincipal()

HttpServletRequest#getRemoteUser()

String name = request.getUserPrincipal().getName();// OrString name = request.getRemoteUser();

在JSP EL中等效：

${pageContext.request.userPrincipal.name}<!-- or -->${pageContext.request.remoteUser}