Implementing Servlet to JSP Parameter Transfer

Project Setup

Begin by creating a Java web project in your preferred IDE such as Eclipse or IntelliJ IDEA.

Servlet Implementation

Create a servlet class to handle HTTP requests and transfer data to JSP pages.

@WebServlet("/dataHandler")
public class DataTransferServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) 
            throws ServletException, IOException {
        // Set attributes to pass to JSP
        request.setAttribute("userName", "Jane Smith");
        request.setAttribute("userRole", "Administrator");
        
        // Forward request to JSP page
        RequestDispatcher dispatcher = request.getRequestDispatcher("/displayData.jsp");
        dispatcher.forward(request, response);
    }
}

Deployment

Deploy your application to a servlet container like Tomcat or Jetty.

Server Execution

Start your server and verify that the application runs correctly.

JSP Parameter Retrieval

In your JSP page, retrieve the attributes set by the servlet:

<%
    String userName = (String) request.getAttribute("userName");
    String userRole = (String) request.getAttribute("userRole");
%>

Parameter Display

Display the retrieved parameters in your JSP:

<div>
    <h2>User Information</h2>
    <p>Name: <%= userName %></p>
    <p>Role: <%= userRole %></p>
</div>

Result

When accessing the servlet URL (e.g., http://localhost:8080/yourapp/dataHandler), the browser will display the user information passed from the servlet.