CS320 HW1

Homework 1
CS320, Fall 2006

Due: Tuesday, October 17

Please upload your files using CSNS. The files should include all the source code, documentation, and an HTML file hw1.html, which contains a link to your servlet on the CS3 server. Note that file uploading will be disabled automatically after 11:59PM of the due date, so please turn in your work on time.

[Reading]

Textbook Chapter 1, 3, 4, 5, 19 except 4.7.

[Online Album]

For this assignment, you are going to write a servlet that implements an online album manager, which manages pictures for a number of users. Each user has their own home page, which we call an album, where they can add and delete pictures, edit the information about the pictures. and organize the pictures in some folders. In particular,

(10pt) When the servlet is requested without any parameter, it displays a list of the albums currently managed by the application. For example:

Welcome to CS320 Online Albums

For this assignment, you need to have at least two users (with cysun being one of them). When a user clicks on one of the albums, the application should displays the selected album as described below.

(30pt) When the servlet is requested with a user parameter, e.g. http://cs3.calstatela.edu:8080/cs320stu31/servlet/AlbumManager?user=cysun, it displays the album of the specified user, which may look like the following:

Folders:

Hawaii
LA

Description:

Pictures taken when we were on vacation in Hawaii.

edit delete	edit delete	edit delete	edit delete
edit delete

If the servlet is requested with an invalid user, simply displays the front page with the list of the albums.

(20pt) An album may have a number of folders. Each folder has a description and contains a number of pictures. For this assignment, you must create at least two folders in each album. A user may choose to see the pictures in a folder by clicking on the name of the folder. Note that currently selected folder should not be "clickable".

(10pt) When a user clicks Delete, the corresponding picture will be deleted. We will leave editing for next time.

(30pt) When a user clicks the Add New Picture button, the servlet displays the following page which allows the user to add a new picture:

Name:
Folder:
File:

[NOTES]

The easiest way to start this application (or any other web application for that matter), is to separate the business logic and the presentation part of the application, and start with the business logic. In particular, the business logic of this application may consist of the following classes: Album, Folder, and Picture. Once you have completed these classes, the presentation part, which is the servlet, is quite straight-forward - simply create a few Album objects (together with their owners, folders, and pictures) as class variables of the servlet, and display or update the objects based on the HTTP requests.
Since we have not covered databases yet, the content of the albums may be lost after the servlet is unloaded or reloaded. That's ok for this assignment.
Our subsequent homework assignments will be built on top of this assignment, so make sure your design, especially the business logic part, is extensible.
Do not spend too much time on the user interface - we will do that in later assignments when we use JSP.