更新时间:2023-11-08 22:49:28
我认为您在这里寻找的是请求,会话或应用程序数据。
I think what you're looking for here is request, session or application data.
在servlet中,您可以将对象作为属性添加到请求对象,会话对象或servlet上下文对象中:
In a servlet you can add an object as an attribute to the request object, session object or servlet context object:
protected void doGet(HttpServletRequest request, HttpServletResponse response) {
String shared = "shared";
request.setAttribute("sharedId", shared); // add to request
request.getSession().setAttribute("sharedId", shared); // add to session
this.getServletConfig().getServletContext().setAttribute("sharedId", shared); // add to application context
request.getRequestDispatcher("/URLofOtherServlet").forward(request, response);
}
如果将它放在请求对象中,它将可供servlet使用被转发到请求完成:
If you put it in the request object it will be available to the servlet that is forwarded to until the request is finished:
request.getAttribute("sharedId");
如果你把它放在会话中,它将可用于所有servlet,但值将会绑定到用户:
If you put it in the session it will be available to all the servlets going forward but the value will be tied to the user:
request.getSession().getAttribute("sharedId");
根据用户的不活动情况,会话到期为止。
Until the session expires based on inactivity from the user.
由您重置:
request.getSession().invalidate();
或者一个servlet将其从范围中移除:
Or one servlet removes it from scope:
request.getSession().removeAttribute("sharedId");
如果将它放在servlet上下文中,它将在应用程序运行时可用:
If you put it in the servlet context it will be available while the application is running:
this.getServletConfig().getServletContext().getAttribute("sharedId");
直到你删除它:
this.getServletConfig().getServletContext().removeAttribute("sharedId");