open_in_new content_copy 
//index.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Parameter Input Form</title>
</head>
<body>
    <h2>Enter Your Details</h2>
    <form action="ParameterServlet" method="post">
        Name: <input type="text" name="name" required><br><br>
        Age: <input type="text" name="age" required><br><br>
        <input type="submit" value="Submit">
    </form>
</body>
</html>

//ParameterServlet.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/ParameterServlet")
public class ParameterServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // Retrieve parameters from the request
        String name = request.getParameter("name");
        String age = request.getParameter("age");

        // Set response content type
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        // Generate response
        out.println("<html><body>");
        out.println("<h2>Your Details:</h2>");
        out.println("<p>Name: " + name + "</p>");
        out.println("<p>Age: " + age + "</p>");
        out.println("</body></html>");
        
        out.close();
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // Redirect to doPost for GET requests
        doPost(request, response);
    }
}