Slide 1: Servlets Can be generic or HTTP specific servletRequest and servletResponse used for generic protocols httpServletRequest and httpServletResponse used for HTTP protocol
Slide 2: Lifecycle of Servlets  init(servletConfig config) { super.init(config); }  service(servletRequest req,servletResponse res)  destroy()
Slide 3: Service methods for HTTP doGet(servletRequest req, servletResponse res); doPost(servletRequest req, servletResponse res); Note: The service method calls doGet or doPost. Signature of service, doGet and doPost is same.
Slide 4: httpServletResponse response.setContentType(“text/html” ) PrintWriter out = response.getWriter()
Slide 5: httpServletRequest getParameter(name) setParameter(name)
Slide 6: servletContext servletContext acts as a shared memory segment for web applications ServletContext context = getServletContext(); setAttribute, getAttribute and removeAttribute
Slide 7: JSP JSP is http specific
Slide 8: Directives Page Directive language=”scriptingLanguage” extends=”className” import=”importList” session=”true|false” buffer=”none|size in kb autoFlush=”true|false” isThreadSafe=”true|false” info=”text” errorPage=”error_url” isErrorPage=”true|false” contentType=”ctinfo”
Slide 9: Directives Include Directive <%@ include file="relativeURLspec" %> Taglib Directive Uri Prefix TagDir
Slide 10: JSP Scripting <! declaration %> <= expression %> <% scriptlet source %>
Slide 11: Implicit Objects Out -- JspWriter (derived from a java.io.Writer) Request -- javax.servlet.http.HttpServletRequest interface Response -- javax.servlet.http.HttpServletResponse object PageContext -- provides access to the namespaces associated with a JSP page SetAttribute getAttribute Session -- javax.servlet.http.HttpSession object store objects between client requests Application -- javax.servlet.ServletContex Config – ServletConfig Page -- contains a reference to the current instance of the JSP being accessed
Slide 12: Standard Actions <jsp:useBean> id, scope, class, beanName,type <jsp:setProperty> <jsp:getProperty> <jsp:param name="name" value="value"/> <jsp:include page="urlSpec" flush="true"> <jsp:forward page="relativeURL"> <jsp:plugin type="pluginType" code="classFile" codebase="relativeURLpath"/>