How can values be passed from a servlet to a JSP page?

1 year ago
William Carter
1 minute

A Servlet can pass values to a JSP page through either request forwarding or request redirection.

  1. Request forwarding: In Servlet, data can be passed to a JSP page by setting attributes in the request object. Code example:
request.setAttribute("message", "Hello JSP!");
RequestDispatcher dispatcher = request.getRequestDispatcher("index.jsp");
dispatcher.forward(request, response);

In a JSP page, the value passed can be accessed through the EL expression ${message}.

  1. Request forwarding: In Servlet, data can be passed to a JSP page by setting URL parameters or storing data in the Session. Example code:
response.sendRedirect("index.jsp?message=Hello JSP!");

In JSP pages, you can retrieve the value passed in the URL parameters by using request.getParameter(“message”), or get the value saved in the Session by using ${sessionScope.message}.

It should be noted that request forwarding is an internal redirection by the server, while request redirection is a redirection by the client.

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