Hi friend,

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

public class CountRowExample extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)throws
ServletException, IOException{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
Connection con = null;
String url = "jdbc:mysql://localhost:3306/";;
String db = "register";
String driver = "com.mysql.jdbc.Driver";
int count= 0;
try{
Class.forName(driver);
con = DriverManager.getConnection(url+db,"root","root");
try{
Statement st = con.createStatement();
ResultSet res = st.executeQuery("SELECT COUNT(*) FROM regiform");
while (res.next()){
count = res.getInt(1);
}
out.println("Number of column:" +count);

}
catch (SQLException ex){
System.out.println("SQL statement is not executed!");
}
}
catch (Exception e){
e.printStackTrace();
}

}
}

-----------------------------------------

<servlet>
<servlet-name>countrow</servlet-name>
<servlet-class>CountRowExample</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>countrow</servlet-name>
<url-pattern>/CountRowExample</url-pattern>
</servlet-mapping

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read for more information

http://www.roseindia.net/servlets/