Aim: Modify the above program to use an xml file instead of database

<form name="login" method="post" action="sls">
    <table width="370" border="1" align="center" style="background: silver;">
        <tr height="25">
            <th colspan="4" align="center">User Login</th>
        </tr>
        <tr>
            <td>User Name</td>
            <td><input type="text" name="uname"></td>
        </tr>
        <tr>
            <td>Password</td>
            <td><input type="password" name="pwd"></td>
        </tr>
        <tr align="center">
            <td align="center" colspan="2">
                <input type="submit" name="ok" value="Submit">
            </td>
        </tr>
    </table>
</form>
        

package pres;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class StudentLoginServlet extends HttpServlet {
    public void service(HttpServletRequest req, HttpServletResponse resp) 
    throws ServletException, IOException {
        resp.setContentType("text/html");
        PrintWriter out = resp.getWriter();
        
        ServletConfig config = getServletConfig();
        String un = req.getParameter("uname");
        String pw = req.getParameter("pwd");
        String uname = config.getInitParameter("uname");
        String pwd = config.getInitParameter("pwd");

        if (un.equals(uname) && pw.equals(pwd)) {
            RequestDispatcher rd = req.getRequestDispatcher("home.jsp");
            rd.forward(req, resp);
        } else {
            RequestDispatcher rd1 = req.getRequestDispatcher("login.html");
            rd1.include(req, resp);
            out.println("<h3 align='center' style='color:red;'>Wrong credentials</h3>");
        }
    }
}
        

<h2>Welcome to the Home Page - You are successfully logged in</h2><br/>
<a href="login.html">Back</a>
        

<web-app>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>

    <servlet>
        <servlet-name>sls</servlet-name>
        <servlet-class>pres.StudentLoginServlet</servlet-class>
        <init-param>
            <param-name>uname</param-name>
            <param-value>kumar</param-value>
        </init-param>
        <init-param>
            <param-name>pwd</param-name>
            <param-value>kumar</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>sls</servlet-name>
        <url-pattern>/sls</url-pattern>
    </servlet-mapping>
</web-app>