qr code java download Building a blog client with Atom protocol in Java

Creating QR Code in Java Building a blog client with Atom protocol

Building a blog client with Atom protocol
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In Atom protocol, blog entries and resources are treated in a consistent way. In fact, a resource is an entry. To model that, we add a new interface called BlogResource which extends our existing BlogEntry interface. Expanded entry model To support Atom s richer entry model, we need a better model for blog entry content, categories, and information about authors and contributors. As you can see in figure 10.1, we ll add three classes associated with the BlogEntry interface: Content, Category, and Person.
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The new interfaces The new blog client library interfaces shown in figure 10.1 are part of the package com.manning.chapter10.blogclient. You can find the source code for the interfaces under the directory java/ch10/src. You ll also find a complete MetaWeblog API implementation of those interfaces there. Now let s move on to our Atom blog client implementation.
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10.3.3 Atom blog client implementation Since we re working in Java, we have two powerful and flexible libraries to help us write our Atom blog client. We ll use HttpClient to execute our GET, POST, PUT, and DELETE requests. And we ll use ROME to generate the XML we send and to parse the XML that comes back. Thanks to those libraries, our implementation is fairly small: nine classes and about a thousand lines of code, including comments. Figure 10.2 shows the blog client interfaces and the Atom blog client implementation classes. Let s discuss the key classes in the Atom implementation, which are shaded gray.
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AtomBlogConnection Created by the BlogConnectionFactory, these objects use an AtomService object to parse the Atom introspection document and determine what blogs are available to the caller. AtomBlog Created by AtomBlogConnection, an AtomBlog object represents a blog that exists on an Atom server. This is the workhorse of the Atom blog client, where most of the HttpClient and ROME calls are made.
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Figure 10.2 Java classes in our Atom protocol blog client implementation
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AtomBlogCollection Created by AtomBlog, this class is an inner class of AtomBlog that represents a collection of entries, which can be of type AtomEntry or AtomResource. AtomEntry Created by AtomBlog, this class represents an Atom blog entry. The class extends the abstract BaseBlogEntry class and implements the BlogEntry interface. It calls back to AtomBlog to do the work of saving, updating, and deleting. It uses PubControl, a custom ROME module, to handle the <app:draft> flag. AtomResource Created by AtomBlog, this class represents an Atom media collection member. It implements BlogResource and extends AtomEntry, because Atom represents resources as entries.
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The new implementation The new Atom blog client library implementation classes are part of the package com.manning.chapter10.atomclient. You can find the source code for the package under the directory java/ch10/src. You ll also find a complete MetaWeblog API implementation of them there. Now, let s briefly discuss how to use the library.
10.3.4 Atom blog client in action
Using the blog client library is easy, and we ve included plenty of examples of its use in the rest of the book. You simply put the jars in your classpath, call the BlogConnnectionFactory to create a BlogConnnection to your blog server, and start blogging with Atom. In the example code for this chapter, we ve included a new version of the BlogPoster from chapter 2 that s been rewritten to use our new blog client library. Here s the portion of the new BlogPoster.java that posts to the first blog found on the blog server:
BlogConnection con = BlogConnectionFactory.getBlogConnection( "atom", target, username, password); Blog blog = (Blog)con.getBlogs().get(0); BlogEntry entry = blog.newEntry(); entry.setTitle(title); entry.setContent(new BlogEntry.Content(description)); entry.save();
As we did for the C# blog client library we developed in chapter 9, we ve developed a simple GUI client that uses the library to support publishing via either the MetaWeblog API or the Atom protocol. Figure 10.3 shows a screenshot of the client. You ll find the code for the GUI client in the example code for the chapter. Refer to the readme file in the examples for instructions on running the client.
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