public class AjaxServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/plain");
response.setHeader("Cache-Control", "no-cache");
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().write(getResponseForZip(request.getParameter("zip")));
}
private String getResponseForZip(String zip) {
return "97402".equals(zip) ? "Eugene,Oregon" : "NO DATA,NO DATA";
}
}
In our example, the Ajax servlet creates a canned response for Eugene,
Oregon, only.
A real application would access a database of zip codes to find the corresponding city and state.