java 将值从 Servlet 传递到我的 JSP
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Passing values from Servlet to my JSP
提问by Bright
I need to pass the String value h from Servlet to the jsp page. If login is success it will be redirected to success page else it need to display "Invalid login message" in login.jsp page
我需要将字符串值 h 从 Servlet 传递到 jsp 页面。如果登录成功，它将被重定向到成功页面，否则它需要在 login.jsp 页面中显示“无效登录消息”
if(success)
{
RequestDispatcher view=getServletContext().getRequestDispatcher("/Success.html");
view.forward(request, response);
}
else
{
String h="Invalid Login";
RequestDispatcher view=getServletContext().getRequestDispatcher("/Login.jsp");
view.forward(request, response);
}
I tried a lot, but its not working.
我尝试了很多，但它不起作用。
回答by Sazzadur Rahaman
Your else block will be like bellow:
您的 else 块将如下所示：
else
{
String h="Invalid Login";
request.setAttibute("message",h);
RequestDispatcher view=getServletContext().getRequestDispatcher("/Login.jsp");
view.forward(request, response);
}
And in your Login.jspfile you should use:
在您的Login.jsp文件中，您应该使用：
${message} //(El expression to access value)
And your message will be displayed.
并且将显示您的消息。
回答by Lightning Boy
You can store your data either in request or in session.Then access that value from your jsp page by using sessionScope or simply ${data}.
您可以将数据存储在请求中或会话中。然后通过使用 sessionScope 或简单地 ${data} 从您的 jsp 页面访问该值。
You can set values in request or session by using the code below in your Servlet.
您可以在 Servlet 中使用以下代码在请求或会话中设置值。
request.setAttribute("data",h);
request.getSession.setAttribute("data",h);
In order to access this value in your jsp page. Add the below code in your jsp page
为了在您的 jsp 页面中访问此值。在你的jsp页面添加以下代码
${data} //if you are storing data in request
${sessionScope.data} //If you are storing data in Session
回答by user2302288
Try to store your data in some scope
尝试将您的数据存储在某个范围内
In servlet
在小服务程序中
request.setAttribute("Data", h);
in jsp
在jsp中
request.getAttribute("Data")
