How to read value of a input field in JSP form through a Servlet using id of that field? [duplicate]

Question

My JSP contains this form tag:

<form action="MyServlet" method="post">
    Fname:<input type="text" id="fname" placeholder="type first name"/>
    <input type="submit" value="ok"/>
</form>

My servlet is:

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

import com.cad.database.DatabaseClass;
import com.cad.example.service.InputService;


public class Input extends HttpServlet {

    private static final long serialVersionUID = 1L;
    public Input() {
        super();
        // TODO Auto-generated constructor stub
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String fname = request.getParameterById("fname");
        System.out.println("My name "+fname);
    }   
}

Answer 1

You can use name field. Thats the proper way and can go with the method request.getParameter().

Answer 2

Add a name attribute to the input element. Now that, your HTML will look like,

<form action="MyServlet" method="post">
Fname:
<input type="text" name="fname" placeholder="type first name" />
<input type="submit" value="ok" />
</form>

This can be accessed anywhere in your servlet/java code as,

String fName = request.getParameter("fname");

As far as i know, ID attribute cannot be used to get values in java. JavaScript can be used in cases to get the innerText or innerHTML using an ID attribute.