Here is a code that displays an interaction between html file and servlet.

1)login.html:

<h1>Login Form</h1>
<form action="http://localhost:8080/examples/validservlet">
<Table>
<tr>
<td>enter name</td>
<td><Input Type="text" name="uname"></td>
</tr>

<tr>
<td>enter password</td>

<td><Input Type="password" name="pwd"></td>
</tr>
<tr>

<td><Input type="checkbox" value="tick">remember my password</td>
</tr>


<tr>
<td><Input type="submit" value="submit"></td>
</tr>

<tr>
<td><Input type="reset" value="clear"></td>
</tr>

</table>
</form>

2)validservlet.java:

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

public class validservlet  extends HttpServlet {
  public void doGet(HttpServletRequest request,   HttpServletResponse response)  throws ServletException, IOException {
  PrintWriter pw = response.getWriter();

  String uname=request.getParameter("uname");
String pwd=request.getParameter("pwd");


 if((uname.equals("rose"))&&(pwd.equals("rose"))){
     out.println("Welcome");
 }
 else{
     response.sendRedirect("/examples/jsp/login.html");
 }
  }
}