RSS and Atom Feeds in Java

Create QR-Code in Java RSS and Atom Feeds
RSS and Atom Feeds
Creating QR-Code In Java
Using Barcode creator for Java Control to generate, create Denso QR Bar Code image in Java applications.
A large and increasing number of information sources now provide their content via a feed to which a user can subscribe, in addition to more traditional publication methods such as a website or an email distribution list JavaFX has support for the two most popular feed protocols RSS (Really Simple Syndication) and AtomYou can find documentation for
Creating Bar Code In Java
Using Barcode printer for Java Control to generate, create barcode image in Java applications.
In JSON terms, a value enclosed in quotes is reported as TEXT even if it looks like a number, so "23" is text, but 23 is an integer and is reported with an INTEGER event
Scanning Bar Code In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
27 Using External Data Sources
QR Code ISO/IEC18004 Drawer In C#
Using Barcode printer for .NET framework Control to generate, create QR-Code image in .NET applications.
the RSS protocol at http://wwwrssboardorg/rss-specification and for Atom at http:// wwwietforg/rfc/rfc4287txt Both Atom and RSS are XML-based protocolsAccess to feeds is usually provided over HTTP, so it is possible to read or subscribe to the content of a feed from a web browser or from a stand-alone application that may display either a single feed or a combination of feeds In this section, we ll show you how to write readers for both RSS and Atom feeds in JavaFX Because feed data is encoded in XML, it is possible to use the HttpRequest class to get the content of a feed and the PullParser class to parse it, but this is not necessary because the classes in the javafxdatafeedrss and javafxdatafeedatom packages take care of the details for youAll you have to do is supply the URL of the feed source, and the data will be retrieved, parsed, converted to JavaFX objects, and delivered to your application
Denso QR Bar Code Generator In Visual Studio .NET
Using Barcode generator for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
Feeds Overview
Quick Response Code Encoder In .NET
Using Barcode generation for .NET Control to generate, create Quick Response Code image in .NET framework applications.
You get an RSS feed by using the RssTask class and an Atom feed from the AtomTask class Both of these classes are derived from the class javafxdatafeedFeedTask, which provides the common variables and behavior for both feed implementationsThe variables of the FeedTask class are listed in Table 27-7
Printing Denso QR Bar Code In VB.NET
Using Barcode generator for VS .NET Control to generate, create QR Code 2d barcode image in VS .NET applications.
Table 27-7 Variable
Generating Bar Code In Java
Using Barcode printer for Java Control to generate, create bar code image in Java applications.
location interval
Data Matrix ECC200 Generation In Java
Using Barcode encoder for Java Control to generate, create Data Matrix 2d barcode image in Java applications.
Variables of the FeedTask Class Type
Bar Code Printer In Java
Using Barcode encoder for Java Control to generate, create bar code image in Java applications.
String Duration
Encoding USS Code 128 In Java
Using Barcode generator for Java Control to generate, create ANSI/AIM Code 128 image in Java applications.
Access
Painting Barcode In Java
Using Barcode printer for Java Control to generate, create bar code image in Java applications.
RI RI
USD - 8 Creator In Java
Using Barcode creator for Java Control to generate, create USD8 image in Java applications.
Default
Bar Code Drawer In Visual Basic .NET
Using Barcode maker for .NET framework Control to generate, create barcode image in .NET applications.
Description
ANSI/AIM Code 128 Creator In .NET Framework
Using Barcode encoder for .NET framework Control to generate, create Code 128 Code Set B image in .NET framework applications.
The URL of the feed source The time between successive polls for content updates
Decoding Data Matrix 2d Barcode In .NET Framework
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications.
headers
Barcode Creator In Visual Studio .NET
Using Barcode encoder for .NET framework Control to generate, create barcode image in .NET applications.
HttpHeader[]
Paint Barcode In .NET Framework
Using Barcode generation for VS .NET Control to generate, create barcode image in .NET applications.
null
Decode Code 128A In .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
The HTTP headers to be sent when requesting the feed Function to be called if an exception occurs while fetching the feed content Function to be called when foreign elements are encountered in the feed content
Barcode Printer In VB.NET
Using Barcode creator for .NET framework Control to generate, create barcode image in VS .NET applications.
onException
function (:Exception) :Void
null
onForeignEvent
function (:Event):Void
null
RSS and Atom Feeds
The location variable gives the URL from which the feed is to be obtained Most feed sources extract all the information that they need from the URL, but in some cases it is possible to configure the feed source by supplying further information in the form of HTTP headers For example, the Twitter search API allows more requests per hour to a client that supplies the User-Agent header than to one that does notYou can specify the headers to be send by setting the headers variable The FeedTask class allows you to make a one-off request for the content of a feed or to subscribe and have the content automatically updated periodicallyYou choose the mode of operation that you want by using one of the following functions to fetch the feed content:
The update() function fetches and parses the whole feed The poll() function fetches and parses only those items in the feed that have changed because the last time the feed was read The start() function performs an update() immediately and then repeats the operation with the frequency given by the interval variable of the FeedTask object, until the stop() function is called Use this function if you want automatic, periodic updates to be delivered to your application (that is, a subscription)
The RSS and Atom feed protocols consist of a set of standard XML elements that the and AtomTask classes parse and convert into equivalent JavaFX objectsThe XML elements and the JavaFX objects to which they are converted are feed-dependent and are discussed in the sections that follow For example, an RSS feed is converted to a Channel object, which contains information about the feed itself, and a set of Entry objects, one for each entry in the feed Some feeds use additional XML elements that are not part of the protocol definition This is often done to make it easier for the receiver of the feed to decode and use its contentYou ll see an example of this when we create a JavaFX client for the Yahoo! Weather service in the next sectionThese additional XML elements are referred to as foreign elements and are delivered to the onForeignEvent function of the FeedTask Because the meaning of these elements is unknown to the RSS and Atom parsers, they are simply delivered as a stream of raw XML events