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Class examples.jms.webshare.WebshareServlet

examples.jms.webshare.WebshareServlet

public class WebshareServlet

This example is a servlet that allows users to rate web pages and receive other users' web page ratings. It demonstrates these features of JMS:

Publish/subscribe (Topic) messaging model.
Using a MapMessage.
Setting and checking the JMSType header field.
Setting message properties.
Using durable subscriptions.
Using message selectors to filter messages.

Any user can publish a web page rating. The servlet requires users to log in with a ClientID. This ClientID is used to reconnect a TopicSubscriber so that the user can receive all of the messages posted. The ClientID is also used in messages to identify the user who published the web page rating.

Configure the server:

Set weblogic.httpd.session.enable=true in the weblogic.properties file.
You must have a connection pool configured and assigned to JMS in the weblogic.properties file. See JMS Examples for instruction on how to set up a connection pool for JMS.

Set up a JMS Topic and a Durable ClientID by adding these properties to your weblogic.properties file:

   weblogic.jms.topic.webshareTopic=jms.topic.webshareTopic
   weblogic.jms.connectionFactoryName.webshare=jms.connection.webshareFactory
   weblogic.jms.connectionFactoryArgs.webshare=ClientID=webshareUser

Register the servlet in your weblogic.properties file by adding this property:
```
  weblogic.httpd.register.webshare=examples.jms.webshare.WebshareServlet
```
Set the servlet classpath and reload properties in your weblogic.properties file by adding the following properties:
```
  weblogic.httpd.servlet.classpath=weblogic/myserver/servletclasses
  weblogic.httpd.servlet.reloadCheckSecs=1
```
where weblogic is the directory where WebLogic is installed.

Build the example:

Set up your development shell, as described in Setting up your environment.
Compile the files in this directory as shown in this examples for Windows NT:
```
  $ javac -d %SERVLET_CLASSES% WebshareServlet.java
```

Run the example:

Start the WebLogic Server in a new command shell.
Load the servlet in a browser with a URL like this:
```
  http://hostname:port/webshare
```
where:

hostname
Host name of the WebLogic Server
port
Port where the WebLogic Server is listening for connections (weblogic.system.ListenPort).
Log in to establish a session with the servlet. Then you can choose to rate web pages, view the posted web page listings, or change your subscription information.

Author:: Copyright (c) 1999-2000 by BEA Systems, Inc. All Rights Reserved.

JMS_FACTORY
MESSAGE_TYPE
TOPIC

WebshareServlet()

editSubscription(PrintWriter, String): Create a DurableSubscription and MessageSelector for the current logged in user.
getLogin(PrintWriter): Draws the login HTML page.
getOptions(PrintWriter): Sticks standard buttons on the bottom of pages.
getRatings(PrintWriter, String): Reads website recommendations from the webshareTopic JMS Topic.
installSelector(PrintWriter, String, String, int, String): Create a selector string and update the user's DurableSubscription
printForm(PrintWriter, String): Displays the website review form.
service(HttpServletRequest, HttpServletResponse)
shareUrl(String, String, int, String, String, String): Publishes a website review to the webshareTopic Topic.

JMS_FACTORY

 public static final String JMS_FACTORY

TOPIC

 public static final String TOPIC

MESSAGE_TYPE

 public static final String MESSAGE_TYPE

WebshareServlet

 public WebshareServlet()

service

 public void service(HttpServletRequest req,
                     HttpServletResponse res) throws IOException, ServletException

getLogin

 public void getLogin(PrintWriter pw) throws Exception

Draws the login HTML page.

getOptions

 public void getOptions(PrintWriter pw) throws Exception

Sticks standard buttons on the bottom of pages. Pressing one of these buttons determines which post method the service() method is going to process.

printForm

 public void printForm(PrintWriter pw,
                       String login) throws Exception

Displays the website review form.

shareUrl

 public void shareUrl(String user,
                      String category,
                      int rating,
                      String summary,
                      String pagetitle,
                      String url) throws NamingException, JMSException

Publishes a website review to the webshareTopic Topic.

editSubscription

 public void editSubscription(PrintWriter pw,
                              String user) throws NamingException, JMSException, Exception

Create a DurableSubscription and MessageSelector for the current logged in user.

installSelector

 public void installSelector(PrintWriter pw,
                             String userName,
                             String posters,
                             int minRating,
                             String categoryList) throws NamingException, JMSException, Exception

Create a selector string and update the user's DurableSubscription

getRatings

 public void getRatings(PrintWriter pw,
                        String user) throws NamingException, JMSException, Exception

Reads website recommendations from the webshareTopic JMS Topic. Creates a DurableSubscriber for whomever is logged in.

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