166 lines
6.5 KiB
Java
166 lines
6.5 KiB
Java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.net.URLEncoder;
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import java.util.Date;
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import java.util.Enumeration;
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import java.util.ResourceBundle;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import util.HTMLFilter;
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/**
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* Example servlet showing request headers
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*
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* @author James Duncan Davidson <duncan@eng.sun.com>
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*/
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public class SessionExample extends HttpServlet {
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private static final long serialVersionUID = 1L;
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private static final int SESSION_ATTRIBUTE_COUNT_LIMIT = 10;
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@Override
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public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
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ResourceBundle rb = ResourceBundle.getBundle("LocalStrings", request.getLocale());
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response.setContentType("text/html");
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response.setCharacterEncoding("UTF-8");
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PrintWriter out = response.getWriter();
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out.println("<!DOCTYPE html><html>");
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out.println("<head>");
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out.println("<meta charset=\"UTF-8\" />");
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String title = rb.getString("sessions.title");
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out.println("<title>" + title + "</title>");
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out.println("</head>");
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out.println("<body bgcolor=\"white\">");
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out.println("<a href=\"../sessions.html\">");
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out.println(
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"<img src=\"../images/code.gif\" height=24 " + "width=24 align=right border=0 alt=\"view code\"></a>");
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out.println("<a href=\"../index.html\">");
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out.println(
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"<img src=\"../images/return.gif\" height=24 " + "width=24 align=right border=0 alt=\"return\"></a>");
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out.println("<h3>" + title + "</h3>");
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HttpSession session = request.getSession(true);
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out.println(rb.getString("sessions.id") + " " + session.getId());
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out.println("<br>");
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out.println(rb.getString("sessions.created") + " ");
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out.println(new Date(session.getCreationTime()) + "<br>");
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out.println(rb.getString("sessions.lastaccessed") + " ");
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out.println(new Date(session.getLastAccessedTime()));
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// Count the existing attributes
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int sessionAttributeCount = 0;
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Enumeration<String> names = session.getAttributeNames();
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while (names.hasMoreElements()) {
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names.nextElement();
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sessionAttributeCount++;
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}
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String dataName = request.getParameter("dataname");
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String dataValue = request.getParameter("datavalue");
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if (dataName != null) {
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if (dataValue == null) {
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session.removeAttribute(dataName);
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sessionAttributeCount--;
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} else if (sessionAttributeCount < SESSION_ATTRIBUTE_COUNT_LIMIT) {
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session.setAttribute(dataName, dataValue);
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sessionAttributeCount++;
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} else {
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out.print("<p> Session attribute [");
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out.print(HTMLFilter.filter(dataName));
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out.print("] not added as there are already "+ SESSION_ATTRIBUTE_COUNT_LIMIT + " attributes in the ");
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out.println("session. Delete an attribute before adding another.");
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}
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}
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out.println("<p>");
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out.println(rb.getString("sessions.data") + "<br>");
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names = session.getAttributeNames();
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while (names.hasMoreElements()) {
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String name = names.nextElement();
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String value = session.getAttribute(name).toString();
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out.println(HTMLFilter.filter(name) + " = " + HTMLFilter.filter(value));
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out.print("<a href=\"");
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out.print(HTMLFilter.filter(
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response.encodeURL("SessionExample?dataname=" + URLEncoder.encode(name, "UTF-8"))));
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out.println("\" >delete</a>");
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out.println("<br>");
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}
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if (sessionAttributeCount < SESSION_ATTRIBUTE_COUNT_LIMIT) {
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out.println("<p>");
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out.print("<form action=\"");
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out.print(response.encodeURL("SessionExample"));
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out.print("\" ");
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out.println("method=POST>");
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out.println(rb.getString("sessions.dataname"));
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out.println("<input type=text size=20 name=dataname>");
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out.println("<br>");
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out.println(rb.getString("sessions.datavalue"));
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out.println("<input type=text size=20 name=datavalue>");
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out.println("<br>");
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out.println("<input type=submit>");
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out.println("</form>");
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out.println("<p>GET based form:<br>");
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out.print("<form action=\"");
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out.print(response.encodeURL("SessionExample"));
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out.print("\" ");
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out.println("method=GET>");
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out.println(rb.getString("sessions.dataname"));
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out.println("<input type=text size=20 name=dataname>");
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out.println("<br>");
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out.println(rb.getString("sessions.datavalue"));
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out.println("<input type=text size=20 name=datavalue>");
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out.println("<br>");
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out.println("<input type=submit>");
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out.println("</form>");
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out.print("<p><a href=\"");
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out.print(HTMLFilter.filter(response.encodeURL("SessionExample?dataname=exampleName&datavalue=exampleValue")));
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out.println("\" >URL encoded </a>");
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} else {
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out.print("<p>You may not add more than " + SESSION_ATTRIBUTE_COUNT_LIMIT + " attributes to this session.");
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}
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out.println("</body>");
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out.println("</html>");
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}
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@Override
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public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
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doGet(request, response);
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}
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}
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