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Servlet/HelloWorld

  • Create an Http Servlet. Override the doGet method, and write 'HelloWorld!' to the response's outputStream.
  • Run your application on Eclipse ('Run as Server').
  • See your own message at 'localhost:8080/YourAppName/YourServletName'
  • Make your servlet respond at 'localhost:8080/YourAppName/' (Edit the @WebServlet annotation path to '/')
  • See that your servlet now responds at 'localhost:8080/YourAppName/'
  • Now undo your change (restore the @WebServlet annotation path).
  • Right click on your project -> Java EE tools -> Generate Deployment descriptor stub.
    • You will now have a 'web.xml' file. It is called a deployment descriptor.
    • Edit the deployment descriptor, and add a first welcome-file tag pointing to 'YourServletName'. We want to register the servlet as a welcome page for your server :)
  • Check the 'html source code' returned by your servlet. You will see no HTML tags. Why?
  • Write an HTML response to your client. For instance <h1>Now that's a big title!</h1>

Congratulations. You've just witnessed what ASP/JSP/PHP is all about. We are not going to do any of that sh** stuff.

Simple news agregator

Do you know what an RSS is?
It is a simple format for describing content (just the content, and not it's visualization). It is an XML-based format.

This is an RSS Your task is simple - create a service (using just a servlet), that shows the latest news in bulgarian in the following categories:

  • General/Bulgaria
  • Technology
  • Sport

Write the ugliest simplest html output you possibly can.
Something like is completely OK.
this

If you don't know HTML, it's okay, just check http://www.w3schools.com/html/html_basic.asp You'll learn a few tricks in no time.

Hints:

  • Pick some RSS feed links from popular news websites. Dnevnik.bg, sportal.bg, etc have RSS feed functionality. Maybe even FMI had one?
  • Do not parse the XML yourself. There are libraries for that, use the ones given in this github folder (the ROME library).
  • Add both jars in the WEB-INF/lib folder. Don't do anything after that, Eclipse will automatically add them to the project's build path.
  • Use this ROME tutorial: http://blog.manishchhabra.com/2011/10/rome-library-example-for-parsing-rss-and-atom-feeds/

Simple JSON pretty printer service.

Just look at the JSON at http://hackbulgaria.com/api/checkins . It is horrible - completely unreadable. What are the elements? What are the JSON objects? You cannot easily tell.