[Servlet] How servlet looks like, what it contains its inside.

Servlet has Context Path(ex. @WebServlet("/file.do")) above class name and it consists of two parts - doGet(), doPost()

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    if( ){
    } else if( ){
    } else if( ){
    } else ...
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    if( ){
    } else if( ){
    } else if( ){
    } else ...
}