/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.IOException; import java.io.PrintWriter; import java.net.URLEncoder; import java.nio.charset.StandardCharsets; import java.util.Date; import java.util.Enumeration; import java.util.ResourceBundle; import jakarta.servlet.ServletException; import jakarta.servlet.http.HttpServlet; import jakarta.servlet.http.HttpServletRequest; import jakarta.servlet.http.HttpServletResponse; import jakarta.servlet.http.HttpSession; import util.HTMLFilter; /** * Example servlet showing request headers * * @author James Duncan Davidson <duncan@eng.sun.com> */ public class SessionExample extends HttpServlet { private static final long serialVersionUID = 1L; private static final int SESSION_ATTRIBUTE_COUNT_LIMIT = 10; @Override public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { ResourceBundle rb = ResourceBundle.getBundle("LocalStrings", request.getLocale()); response.setContentType("text/html"); response.setCharacterEncoding("UTF-8"); PrintWriter out = response.getWriter(); out.println(""); out.println(""); out.println(""); String title = rb.getString("sessions.title"); out.println("" + title + ""); out.println(""); out.println(""); out.println(""); out.println( "\"view"); out.println(""); out.println( "\"return\""); out.println("

" + title + "

"); HttpSession session = request.getSession(true); out.println(rb.getString("sessions.id") + " " + session.getId()); out.println("
"); out.println(rb.getString("sessions.created") + " "); out.println(new Date(session.getCreationTime()) + "
"); out.println(rb.getString("sessions.lastaccessed") + " "); out.println(new Date(session.getLastAccessedTime())); // Count the existing attributes int sessionAttributeCount = 0; Enumeration names = session.getAttributeNames(); while (names.hasMoreElements()) { names.nextElement(); sessionAttributeCount++; } String dataName = request.getParameter("dataname"); String dataValue = request.getParameter("datavalue"); if (dataName != null) { if (dataValue == null) { session.removeAttribute(dataName); sessionAttributeCount--; } else if (sessionAttributeCount < SESSION_ATTRIBUTE_COUNT_LIMIT) { session.setAttribute(dataName, dataValue); sessionAttributeCount++; } else { out.print("

Session attribute ["); out.print(HTMLFilter.filter(dataName)); out.print("] not added as there are already "+ SESSION_ATTRIBUTE_COUNT_LIMIT + " attributes in the "); out.println("session. Delete an attribute before adding another."); } } out.println("

"); out.println(rb.getString("sessions.data") + "
"); names = session.getAttributeNames(); while (names.hasMoreElements()) { String name = names.nextElement(); String value = session.getAttribute(name).toString(); out.println(HTMLFilter.filter(name) + " = " + HTMLFilter.filter(value)); out.print("delete"); out.println("
"); } if (sessionAttributeCount < SESSION_ATTRIBUTE_COUNT_LIMIT) { out.println("

"); out.print("

"); out.println(rb.getString("sessions.dataname")); out.println(""); out.println("
"); out.println(rb.getString("sessions.datavalue")); out.println(""); out.println("
"); out.println(""); out.println("
"); out.println("

GET based form:
"); out.print("

"); out.println(rb.getString("sessions.dataname")); out.println(""); out.println("
"); out.println(rb.getString("sessions.datavalue")); out.println(""); out.println("
"); out.println(""); out.println("
"); out.print("

URL encoded "); } else { out.print("

You may not add more than " + SESSION_ATTRIBUTE_COUNT_LIMIT + " attributes to this session."); } out.println(""); out.println(""); } @Override public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { doGet(request, response); } }