Hi friend,

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

public class DataInsertionExam extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String url = "jdbc:mysql://localhost:3306/";;
String db = "register";
Connection conn;
try{
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url+db,"root","root");
Statement statement = conn.createStatement();
String query = "insert into userdata values(1,'Amardeep', 'Programmer')";
int i = statement.executeUpdate(query);
if(i!=0){
out.println("The record has been inserted");
}
else{
out.println("Sorry! Failure");
}

statement.close();
}
catch (Exception e){
System.out.println(e);
}
}
}
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<servlet>
<servlet-name>InsertDataExample</servlet-name>
<servlet-class>DataInsertionExam</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>InsertDataExample</servlet-name>
<url-pattern>/DataInsertionExam</url-pattern>
</servlet-mapping>

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read for more information,

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