JSP mechanisms:

• Expression.
  Hostname: <%= request.getRemoteHost() %>.
• Scriptlet.
  <% out.println("Attached GET data: " + request.getQueryString()); %>
• Declaration (plus expression).
  <%! private int accessCount = 0; %> Accesses to page since server reboot: <%= ++accessCount %>
• Directive (plus expression).
  <%@ page import = "java.util.*" %> Current date: <%= new Date() %>