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Pull request #1107 

Slight improvements and simplification.
 - Use the SessionHandler created by the ServletContext
 - Use a single servlet to set and get the greeting
 - Added more information about the session
 - Added convenience links for the demo
This commit is contained in:
Greg Wilkins 2016-11-16 14:31:31 +11:00
parent 2c88bf0f83
commit 417fb1d7f8
3 changed files with 51 additions and 68 deletions
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48
examples/embedded/src/main/java/org/eclipse/jetty/embedded/HelloSessionServlet.java
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@ -21,6 +21,7 @@ package org.eclipse.jetty.embedded;
import org.eclipse.jetty.server.session.HashedSession;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
@ -29,8 +30,6 @@ import javax.servlet.http.HttpServletResponse;
public class HelloSessionServlet extends HttpServlet
{
private String greeting;
public HelloSessionServlet() {}
@Override
@ -38,14 +37,47 @@ public class HelloSessionServlet extends HttpServlet
HttpServletResponse response ) throws ServletException,
IOException
{
HashedSession session = (HashedSession)request.getSession();
if((greeting = (String)session.getAttribute("greeting")) == null) {
greeting = "Hello";
}
response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().println(
"<h1>" + greeting + " from HelloSessionServlet</h1>");
response.addHeader("Cache-Control","no-cache");
HashedSession session = (HashedSession)request.getSession();
String message;
String link;
String greeting = request.getParameter("greeting");
if (greeting != null)
{
session.setAttribute("greeting", greeting);
message = "New greeting '" + greeting + "' set in session.";
link = "Click <a href=\"/\">here</a> to use the new greeting from the session.";
}
else
{
greeting = (String)session.getAttribute("greeting");
if (greeting != null)
{
message = "Greeting '" + greeting + "' set from session.";
}
else
{
greeting = "Hello";
message = "Greeting '" + greeting + "' is default.";
}
link = "Click <a href=\"/?greeting=Hola\">here</a> to set a new greeting.";
}
PrintWriter out = response.getWriter();
out.println("<h1>" + greeting + " from HelloSessionServlet</h1>");
out.println("<p>" + message + "</p>");
out.println("<pre>");
out.println("session.getId() = " +session.getId());
out.println("session.isNew() = " +session.isNew());
out.println("</pre>");
out.println("<p>" + link + "</p>");
}
}

24
examples/embedded/src/main/java/org/eclipse/jetty/embedded/OneServletContextWithSession.java
View File

@ -32,29 +32,27 @@ public class OneServletContextWithSession
{
Server server = new Server(8080);
SessionHandler handler = new SessionHandler();
handler.setServer(server);
HashSessionManager manager = new HashSessionManager();
handler.setSessionManager(manager);
// Create an ID manager for the server. This is normally done
// by default, but is done explicitly here for demonstration.
AbstractSessionIdManager idManager = new HashSessionIdManager();
manager.setSessionIdManager(idManager);
server.setSessionIdManager(idManager);
// Create a ServletContext, with a session handler enabled.
ServletContextHandler context = new ServletContextHandler(
ServletContextHandler.SESSIONS);
context.setContextPath("/");
context.setResourceBase(System.getProperty("java.io.tmpdir"));
server.setHandler(context);
//Servlet to store a different greeting in the session
//Can be accessed using http://localhost:8080/store
context.addServlet(StoreInSessionServlet.class, "/store/*");
// Access the SessionHandler from the context.
SessionHandler sessions = context.getSessionHandler();
// Set a SessionManager. This is normally done by default,
// but is done explicitly here for demonstration.
sessions.setSessionManager(new HashSessionManager());
//Servlet to read the greeting stored in the session, if you have not visited the
//StoreInSessionServlet a default greeting is shown, after visiting you will see
//a different greeting.
//Servlet to read/set the greeting stored in the session.
//Can be accessed using http://localhost:8080/hello
context.addServlet(HelloSessionServlet.class, "/");

47
examples/embedded/src/main/java/org/eclipse/jetty/embedded/StoreInSessionServlet.java
View File

@ -1,47 +0,0 @@
//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.embedded;
import org.eclipse.jetty.server.session.HashedSession;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class StoreInSessionServlet extends HttpServlet
{
public StoreInSessionServlet() {}
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response ) throws ServletException,
IOException
{
HashedSession session = (HashedSession)request.getSession();
session.setAttribute("greeting", "New Hello");
response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().println(
"<h1>Value 'New Hello' stored in session.</h1>");
}
}