qr code reader java app download Implementing the File Depot in Java in Java

Paint QR Code 2d barcode in Java Implementing the File Depot in Java

8.4.1 Implementing the File Depot in Java
QR Code Generation In Java
Using Barcode maker for Java Control to generate, create QR-Code image in Java applications.
www.OnBarcode.com
Scan QR Code In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Before we can generate and serve a newsfeed for the File Depot, we need the File Depot itself, so let s create it. The concept is simple: File Depot is simply a collection of files. For the purposes of this example, we define the depot with a simple Java interface called Depot, shown next:
Barcode Drawer In Java
Using Barcode drawer for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
QR-Code Generator In Java
Using Barcode generator for Java Control to generate, create Quick Response Code image in Java applications.
www.OnBarcode.com
Generating newsfeeds with Java
Making Barcode In Java
Using Barcode printer for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
Barcode Encoder In Java
Using Barcode generation for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
package com.manning.blogapps.chapter08.filedepot; import java.util.Collection; import java.util.Date; public interface Depot { public abstract Collection getFiles(); public abstract Date getLastUpdateDate(); public abstract void update(); }
EAN128 Generator In Java
Using Barcode printer for Java Control to generate, create GTIN - 128 image in Java applications.
www.OnBarcode.com
Royal Mail Barcode Generation In Java
Using Barcode creation for Java Control to generate, create RM4SCC image in Java applications.
www.OnBarcode.com
As you can see, the Depot interface allows you to get a collection of files, get the last update time for the files, and update the collection by rescanning the files contained in the depot. The getFiles() method returns a collection of java. io.File objects. The FileDepot class implements the Depot interface, but the actual implementation is not central to our topic, which is generating newsfeeds. We won t discuss the implementation here, but you can find the full source code for it in the examples directory in the file FileDepot.java. Now that we have our File Depot in place, we are ready to discuss newsfeed generation.
QR Generator In VS .NET
Using Barcode creator for Reporting Service Control to generate, create QR Code JIS X 0510 image in Reporting Service applications.
www.OnBarcode.com
Paint QR-Code In VS .NET
Using Barcode creator for VS .NET Control to generate, create QR Code image in VS .NET applications.
www.OnBarcode.com
8.4.2 Generating the File Depot newsfeed in Java
Draw EAN13 In .NET Framework
Using Barcode drawer for VS .NET Control to generate, create GTIN - 13 image in Visual Studio .NET applications.
www.OnBarcode.com
Data Matrix 2d Barcode Generator In None
Using Barcode drawer for Office Word Control to generate, create DataMatrix image in Microsoft Word applications.
www.OnBarcode.com
Now, let s use ROME to create a newsfeed writer that can generate newsfeeds in any RSS or Atom format. We ll design the writer so that it can be used dynamically from within a web application or statically from a command-line invocation. Our new class, DepotNewsfeedWriter, is shown in full in listing 8.1.
Encode GS1 - 13 In .NET Framework
Using Barcode creator for Reporting Service Control to generate, create GS1 - 13 image in Reporting Service applications.
www.OnBarcode.com
Generate UPC-A In .NET
Using Barcode drawer for .NET Control to generate, create GS1 - 12 image in .NET applications.
www.OnBarcode.com
Listing 8.1 DepotNewsfeedWriter.java
QR Code Creator In Java
Using Barcode creation for Android Control to generate, create Denso QR Bar Code image in Android applications.
www.OnBarcode.com
Encoding Barcode In Java
Using Barcode encoder for Eclipse BIRT Control to generate, create Barcode image in Eclipse BIRT applications.
www.OnBarcode.com
package com.manning.blogapps.chapter08.filedepot; import java.io.*; import java.util.*; import com.sun.syndication.feed.WireFeed; import com.sun.syndication.feed.synd.*; import com.sun.syndication.io.WireFeedOutput; public class DepotNewsfeedWriter { private Depot depot; public DepotNewsfeedWriter(Depot depot) { this.depot = depot; }
Generating Barcode In .NET
Using Barcode maker for Visual Studio .NET Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
Paint Barcode In None
Using Barcode creation for Office Excel Control to generate, create Barcode image in Excel applications.
www.OnBarcode.com
public void write( Writer writer, String baseURL, String format) throws Exception {
Print Barcode In None
Using Barcode creation for Microsoft Word Control to generate, create Barcode image in Office Word applications.
www.OnBarcode.com
PDF-417 2d Barcode Generation In .NET
Using Barcode drawer for Reporting Service Control to generate, create PDF 417 image in Reporting Service applications.
www.OnBarcode.com
How to serve newsfeeds
SyndFeed feed = new SyndFeedImpl(); feed.setFeedType(format); feed.setLanguage("en-us"); feed.setTitle("File Depot Newsfeed"); feed.setDescription( "Newly uploaded files in the File Depot"); feed.setLink(baseURL); feed.setUri(baseURL + "/depot-newsfeed"); feed.setPublishedDate(depot.getLastUpdateDate()); SyndLink selfLink = new SyndLinkImpl(); selfLink.setHref(feed.getUri()); selfLink.setRel("self"); feed.setLinks(Collections.singletonList(selfLink)); ArrayList entries = new ArrayList(); Iterator files = depot.getFiles().iterator(); while (files.hasNext()) { File file = (File) files.next();
SyndEntry entry = new SyndEntryImpl(); String url = baseURL + file.getName(); entry.setLink(url); entry.setUri(url); entry.setTitle(file.getName()); entry.setPublishedDate(new Date(file.lastModified())); entry.setUpdatedDate(new Date(file.lastModified())); SyndContent description = new SyndContentImpl(); description.setValue( "Click <a href='"+url+"'>" + file.getName() + "</a> to download the file."); entry.setDescription(description); entries.add(entry); } feed.setEntries(entries);
i j 1)
WireFeedOutput output = new WireFeedOutput(); WireFeed wireFeed = feed.createWireFeed(); output.output(wireFeed, writer); } public void main(String[] args) throws Exception { if (args.length < 3) { System.out.println( "USAGE: DepotNewsfeedWriter " + "[depotDir] [depotUrl] [file] [format]"); return; }
Generating newsfeeds with Java
String depotDir = args[0]; Depot depot = new FileDepot(depotDir); DepotNewsfeedWriter newsfeedWriter = new DepotNewsfeedWriter(depot);
String depotUrl = args[1]; String filePath = args[2]; String format = args[3]; FileWriter writer = new FileWriter(filePath); newsfeedWriter.write(writer, depotUrl, format); } }
The code defines a class called DepotNewsfeedWriter that can be used to write newsfeeds for a depot. To construct a DepotNewsfeedWriter, you use the constructor b, which accepts a depot object. Once you have constructed a DepotNewsfeedWriter, you can call its write() method C to write out a newsfeed that references the files most recently added to the depot. To write a newsfeed, you must provide the java.io.Writer to be written to, the base URL to be used in the generated newsfeed, and the type of newsfeed you wish to have generated (for example, rss_0.91, rss_0.92, rss_1.0, rss_2.0, or atom_1.0). The write() method works by first creating a newsfeed object model in memory and then writing that model out to XML format. We start by creating a ROME SyndFeed object, which represents the feed itself D. After we set the feed type to tell ROME which newsfeed format to generate, we start setting the feed-level properties, like title, link, description, and publication date. So that we can support Atom, we add a self link back to the newsfeed itself e. Next, we need to loop through the files in the depot and create a ROME SyndEntry object for each file. We declare an ArrayList to hold the collection of entries we create and we start while looping though the files returned by the depot f. Within the loop, we create a SyndEntry for each file, and we set its entry-level properties such as title, link, and published date g. The description for each entry is a sentence that contains an HTML hyperlink so that the user can download it. We don t need to escape the HTML because ROME will take care of that for us h. We add each new entry to the ArrayList we declared earlier i, and when the entry collection is complete, we add it to the SyndFeed object j. Finally, we create the ROME WireFeed and WireFeedOutput objects we need and we write out the newsfeed 1) .
Copyright © OnBarcode.com . All rights reserved.