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web.xml file.

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>Register</display-name>
  <servlet>
  <servlet-name>Register</servlet-name>
  <servlet-class>Register</servlet-class>
  </servlet>
  <servlet-mapping>
  <servlet-name>Register</servlet-name>
  <url-pattern>/Register</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

Register.java

import java.sql.PreparedStatement;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@SuppressWarnings("serial")
public class Register extends HttpServlet {

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
		PrintWriter out = response.getWriter();
		response.setContentType("text/html");
		String name = request.getParameter("userName");
		String pass = request.getParameter("userPass");
		String email = request.getParameter("userEmail");
		String country = request.getParameter("userCountry");
		try {
			Class.forName("com.mysql.jdbc.Driver");
			Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/register", "root", "#Tandy1997");
			PreparedStatement ps = con.prepareStatement("insert into register values(?,?,?,?)");
			ps.setString(1, name);
			ps.setString(2, pass);
			ps.setString(3, email);
			ps.setString(4, country);
			int x = ps.executeUpdate();
			if (x > 0) {
				out.println("You have Succefully Registered");
			}
		}
		catch (SQLException se) {
			System.out.println(se.getErrorCode());
		}
		catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

servlet.html .

<!DOCTYPE html>
<html>

<body>
 <p>
 <h1>Hey your welcome!</h1></p>
<form action="servlet/Register" method="post">

Name:<input type="text" name="userName"/><br/><br/>
Password:<input type="password" name="userPass"/><br/><br/>
Email Id:<input type="text" name="userEmail"/><br/><br/>
Country:
<select name="userCountry">
<option>India</option>
<option>Pakistan</option>
<option>Uganda</option>
<option>other</option>
</select>

<br/><br/>
<input type="submit" value="register"/>

</form>
</body>
</html>