3 Servlet

WEEK 3: SERVLETS Matt Green MS.Ed , Instructor at WCTC 152

197 DISTRIBUTED JAVA Writing a Servlet 2 Servlets Class Declaration (What is a Servlet?) public class SimpleServlet extends HttpServlet doGet vs. doPost Request and Response Objects protected void doGet ( HttpServletRequest request, HttpServletResponse response) throws ServletException , IOException { 3 Response HttpServletResponse Referencing the HttpServletResponse Writer PrintWriter out = response.getWriter (); String docType = "<! DOCTYPE html>
n "; out .println ( docType

• "< html>
  n);
  Setting HttpServletResponse Content type response.setContentType ("text/html"); 4 Request HttpServletRequest request http ://site.co m / simple?full_name=Bob&toppings=Olives&toppings= Anchovies&toppings= Mango Accessing HttpServletRequest parameters String fullName = request.getParameter (" full_name "); Accessing multiple values from a parameter (Checkbox) String[] paramValues = request.getParameterValues ("toppings "); L ist of HttpServletRequest parameter names Enumeration paramNames = request.getParameterNames (); 5