spring: add session attribute in every controller model

Question

我想在模型中为每个控制器添加常用属性。

Answer 1

HandlerInterceptorAdapter can be used to intercept the request. For example, you can override preHandle to validate the session, and add the user to model in postHandle.

public class SessionValidator extends HandlerInterceptorAdapter{

@Override
public boolean preHandle(HttpServletRequest request,
                         HttpServletResponse response, Object handler) throws Exception {
    HttpSession session = request.getSession();
    if (session == null || session.getAttribute("user") == null) {
        return false;
    }
    return super.preHandle(request, response, handler);
}


@Override
public void postHandle(HttpServletRequest request,
                       HttpServletResponse response, Object handler,
                       ModelAndView modelAndView) throws Exception {
    HttpSession session = request.getSession();

    if (modelAndView != null) {
        modelAndView.getModelMap().addAttribute("user", session.getAttribute("user"));
    }
}

}