{"id":117,"date":"2017-03-02T07:34:20","date_gmt":"2017-03-02T07:34:20","guid":{"rendered":"http:\/\/codeinsightacademy.com\/blog\/?p=117"},"modified":"2017-05-11T15:34:23","modified_gmt":"2017-05-11T15:34:23","slug":"session-management-in-java","status":"publish","type":"post","link":"https:\/\/codeinsightacademy.com\/blog\/java\/session-management-in-java\/","title":{"rendered":"Session Management in Java"},"content":{"rendered":"

List of Files<\/p>\n

    \n
  1. header.jsp<\/li>\n
  2. login.jsp<\/li>\n
  3. home.jsp<\/li>\n
  4. logout.jsp<\/li>\n<\/ol>\n
    \n

    header.jsp<\/p>\n

    <a href=\"login.jsp\">Login<\/a>\r\n<a href=\"home.jsp\">Home<\/a>\r\n<a href=\"logout.jsp\">Logout<\/a><\/pre>\n
     <\/p>\n
    \n
    login.jsp<\/p>\n
     <\/p>\n
    <%\r\n    HttpSession sess = request.getSession();\r\n\r\n    if (sess.getAttribute(\"sess_username\") != null) { \/\/ check is session variable exist in session pool or not\r\n        response.sendRedirect(\"home.jsp\"); \/\/ if session variable is already set then redirect it to home page else stay on login page\r\n    }\r\n%>\r\n\r\n<!DOCTYPE html>\r\n<html>\r\n    <head>\r\n        <meta http-equiv=\"Content-Type\" content=\"text\/html; charset=UTF-8\">\r\n        <title>JSP Page<\/title>\r\n    <\/head>\r\n    <body>\r\n        <%@include file=\"header.jsp\" %>\r\n        <h1>Login<\/h1>\r\n        <form action=\"home.jsp\" method=\"post\">\r\n            Username <input type=\"text\" name=\"username\"\/><br\/>\r\n            Password <input type=\"password\" name=\"password\"\/><br\/>\r\n            <input type=\"submit\" value=\"Login\"\/>\r\n        <\/form>\r\n    <\/body>\r\n<\/html><\/pre>\n
     <\/p>\n
    \n
    home.jsp<\/p>\n
     <\/p>\n
    <%\r\n    HttpSession sess = request.getSession(); \/\/get the session object from getSession() method of request object\r\n\r\n    if (sess.getAttribute(\"sess_username\") == null) { \/\/ check whether the session variable is exist in session pool or not\r\n        sess.setAttribute(\"sess_username\", request.getParameter(\"username\")); \/\/ create session variable if it is not present in session pool\r\n    }\r\n%>\r\n\r\n<!DOCTYPE html>\r\n<html>\r\n    <head>\r\n        <meta http-equiv=\"Content-Type\" content=\"text\/html; charset=UTF-8\">\r\n        <title>JSP Page<\/title>\r\n    <\/head>\r\n    <body>\r\n        <%@include file=\"header.jsp\" %>\r\n        <h1>Home<\/h1>\r\n        <h2>Hello <%=sess.getAttribute(\"sess_username\")%> <\/h2>\r\n    <\/body>\r\n<\/html><\/pre>\n
     <\/p>\n
    \n
    logout.jsp<\/p>\n
     <\/p>\n
    <%\r\n    HttpSession sess = request.getSession();\r\n    sess.invalidate(); \/\/ this will terminate the session and destroy all variables stored in session pool\r\n%>\r\n\r\n<!DOCTYPE html>\r\n<html>\r\n    <head>\r\n        <meta http-equiv=\"Content-Type\" content=\"text\/html; charset=UTF-8\">\r\n        <title>JSP Page<\/title>\r\n    <\/head>\r\n    <body>\r\n        <%@include file=\"header.jsp\" %>\r\n        <h1>Logout<\/h1>\r\n    <\/body>\r\n<\/html><\/pre>\n
     <\/p>\n
    \n
    Display Session variables from pool<\/p>\n
    Console o\/p:<\/p>\n
     <\/p>\n
    Enumeration attributeNames = sess.getAttributeNames();\r\n\r\nwhile (attributeNames.hasMoreElements()) {\r\n\r\n    String name = (String) attributeNames.nextElement();\r\n\r\n    String value = (String) sess.getAttribute(name);\r\n\r\n    out.println(name + \"=\" + value);\r\n\r\n}<\/pre>\n
     <\/p>\n
    JSTL(Java Server Pages Standard Tag Library<\/span>) o\/p:<\/p>\n
    <c:forEach var=\"session\" items=\"${sessionScope}\">\r\n\r\n    ${session.key} = ${session.value}\r\n\r\n<\/c:forEach><\/pre>\n
     <\/p>\n
     <\/p>\n","protected":false},"excerpt":{"rendered":"
    List of Files header.jsp login.jsp home.jsp logout.jsp header.jsp <a href=”login.jsp”>Login<\/a> <a href=”home.jsp”>Home<\/a> <a href=”logout.jsp”>Logout<\/a>   login.jsp   <% HttpSession sess = request.getSession(); if (sess.getAttribute(“sess_username”) != null) { \/\/ check is session variable exist in session pool or not response.sendRedirect(“home.jsp”); \/\/ if session variable is already set then redirect it to home page else stay on […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/codeinsightacademy.com\/blog\/wp-json\/wp\/v2\/posts\/117"}],"collection":[{"href":"https:\/\/codeinsightacademy.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/codeinsightacademy.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/codeinsightacademy.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/codeinsightacademy.com\/blog\/wp-json\/wp\/v2\/comments?post=117"}],"version-history":[{"count":12,"href":"https:\/\/codeinsightacademy.com\/blog\/wp-json\/wp\/v2\/posts\/117\/revisions"}],"predecessor-version":[{"id":251,"href":"https:\/\/codeinsightacademy.com\/blog\/wp-json\/wp\/v2\/posts\/117\/revisions\/251"}],"wp:attachment":[{"href":"https:\/\/codeinsightacademy.com\/blog\/wp-json\/wp\/v2\/media?parent=117"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codeinsightacademy.com\/blog\/wp-json\/wp\/v2\/categories?post=117"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codeinsightacademy.com\/blog\/wp-json\/wp\/v2\/tags?post=117"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}