毕业设计&课设-Java IO实验室（流上的文件系统、管道和过滤器模式）.zip

# Teaching-HEIGVD-RES-2019-Labo-Java-IO ### About the 2019 version of this lab We changed the project structure. In previous editions, there was a "test" project (with its own pom.xml), a "production" project (with its own pom.xml) and a top-level "build" project. This is what you will see in the webcasts. This year, we have moved to a single project, with production and test packages. **Warning: do NOT change the code in the test packages** ### About previous versions of this lab Before reading this documentation and diving into the code, you should watch [this webcast](https://www.youtube.com/watch?v=qgncWAUqcbY&index=1&list=PLfKkysTy70QYD00EqEabdwyDNTPwLcsFV), which shows a **demo** of the application that you will implement. Later on, you might also watch [this webcast](https://www.youtube.com/watch?v=v_ZpVgf0lGc&index=2&list=PLfKkysTy70QYD00EqEabdwyDNTPwLcsFV), which gives you some hints about the **code structure**. If you watch carefully, you will see that in 2015, we were using a web service called [iheartquotes](http://www.iheartquotes.com/) to fetch dynamic text data. This service is now down, so this year we had to look for [a replacement](http://www.icndb.com/api/). We also had to adapt the code of the starter project a bit. You will see why and how when in the commented source code. We also fixed an issue with previous versions of the lab. In the past, our specification was not correct when talking about **depth-first traversal**. Our unit tests specified a wrong behaviour. We have fixed them. For these reasons, there will be some differences in the console output, but nothing extraordinary.  ### Introduction The objective of this lab is to get familiar with the Java IO APIs and to interact with the file system. You will implement an application that performs the following tasks: 1. The user invokes the application on the **command line** and provides a numeric argument (*n*). 2. The application **uses a Web Service client** (which is provided to you) to fetch *n* **quotes** from the [Internet Chuck Norris Database](http://www.icndb.com/api/) online service. 3. The application stores the content of each quote in a **text file** (utf-8), on the local filesystem. It uses the *tags* associated to each quote to create a hierarchical structure of directories. 4. The application then **traverses the local file system** (depth-first) and applies a processing to each visited quote file. 5. The processing consists of 1) converting all characters to their **uppercase** value and 2) adding a **line number** (followed by a tab character) at the beginning of each line. This is achieved by combining sub-classes of the `FilterWriter` class. If your application is fully implemented you should have the following result on your machine: #### A. When building the application ``` [INFO] Scanning for projects... [INFO] [INFO] --------------------< ch.heigvd.res.io:lab-java-io >-------------------- [INFO] Building RES Lab Java IO 1.0-SNAPSHOT [INFO] --------------------------------[ jar ]--------------------------------- ... (skipping some of the log output) [INFO] Running ch.heigvd.res.labio.impl.explorers.DFSFileExplorerTest [INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.15 s - in ch.heigvd.res.labio.impl.explorers.DFSFileExplorerTest [INFO] [INFO] Results: [INFO] [INFO] Tests run: 27, Failures: 0, Errors: 0, Skipped: 0 ... (skipping some of the log output) [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 7.497 s [INFO] Finished at: 2019-03-04T08:12:55+01:00 [INFO] ------------------------------------------------------------------------ ``` #### B. When running the application ``` $ java -jar Lab01App-code/target/Lab01App-code-1.0-SNAPSHOT-launcher.jar 10 INFO: Received a new joke with 4 tags. INFO: > movie INFO: > internet INFO: > geek INFO: > popular INFO: Received a new joke with 4 tags. INFO: > movie INFO: > funny INFO: > geek INFO: > joke INFO: Received a new joke with 2 tags. INFO: > hilarious INFO: > movie INFO: Received a new joke with 1 tags. INFO: > geek INFO: Received a new joke with 7 tags. INFO: > internet INFO: > geek INFO: > movie INFO: > joke INFO: > funny INFO: > hilarious INFO: > popular INFO: Received a new joke with 0 tags. INFO: Received a new joke with 1 tags. INFO: > popular INFO: Received a new joke with 0 tags. INFO: Received a new joke with 1 tags. INFO: > popular INFO: Received a new joke with 2 tags. INFO: > hilarious INFO: > geek INFO: ./workspace/quotes ./workspace/quotes/geek ./workspace/quotes/geek/quote-4.utf8 ./workspace/quotes/hilarious ./workspace/quotes/hilarious/geek ./workspace/quotes/hilarious/geek/quote-10.utf8 ./workspace/quotes/hilarious/movie ./workspace/quotes/hilarious/movie/quote-3.utf8 ./workspace/quotes/internet ./workspace/quotes/internet/geek ./workspace/quotes/internet/geek/movie ./workspace/quotes/internet/geek/movie/joke ./workspace/quotes/internet/geek/movie/joke/funny ./workspace/quotes/internet/geek/movie/joke/funny/hilarious ./workspace/quotes/internet/geek/movie/joke/funny/hilarious/popular ./workspace/quotes/internet/geek/movie/joke/funny/hilarious/popular/quote-5.utf8 ./workspace/quotes/movie ./workspace/quotes/movie/funny ./workspace/quotes/movie/funny/geek ./workspace/quotes/movie/funny/geek/joke ./workspace/quotes/movie/funny/geek/joke/quote-2.utf8 ./workspace/quotes/movie/internet ./workspace/quotes/movie/internet/geek ./workspace/quotes/movie/internet/geek/popular ./workspace/quotes/movie/internet/geek/popular/quote-1.utf8 ./workspace/quotes/popular ./workspace/quotes/popular/quote-7.utf8 ./workspace/quotes/popular/quote-9.utf8 ./workspace/quotes/quote-6.utf8 ./workspace/quotes/quote-8.utf8 ``` #### C. After running the application ``` $ find ./workspace ./workspace ./workspace/quotes ./workspace/quotes/geek ./workspace/quotes/geek/quote-4.utf8 ./workspace/quotes/geek/quote-4.utf8.out ./workspace/quotes/hilarious ./workspace/quotes/hilarious/geek ./workspace/quotes/hilarious/geek/quote-10.utf8 ./workspace/quotes/hilarious/geek/quote-10.utf8.out ./workspace/quotes/hilarious/movie ./workspace/quotes/hilarious/movie/quote-3.utf8 ./workspace/quotes/hilarious/movie/quote-3.utf8.out ./workspace/quotes/internet ./workspace/quotes/internet/geek ./workspace/quotes/internet/geek/movie ./workspace/quotes/internet/geek/movie/joke ./workspace/quotes/internet/geek/movie/joke/funny ./workspace/quotes/internet/geek/movie/joke/funny/hilarious ./workspace/quotes/internet/geek/movie/joke/funny/hilarious/popular ./workspace/quotes/internet/geek/movie/joke/funny/hilarious/popular/quote-5.utf8 ./workspace/quotes/internet/geek/movie/joke/funny/hilarious/popular/quote-5.utf8.out ./workspace/quotes/movie ./workspace/quotes/movie/funny ./workspace/quotes/movie/funny/geek ./workspace/quotes/movie/funny/geek/joke ./workspace/quotes/movie/funny/geek/joke/quote-2.utf8 ./workspace/quotes/movie/funny/geek/joke/quote-2.utf8.out ./workspace/quotes/movie/internet ./workspace/quotes/movie/internet/geek ./workspace/quotes/movie/internet/geek/popular ./workspace/quotes/movie/internet/geek/popular/quote-1.utf8 ./workspace/quotes/movie/internet/geek/popular/quote-1.utf8.out ./workspace/quotes/popular ./workspace/quotes/popular/quote-7.utf8 ./workspace/quotes/popular/quote-7.utf8.out ./workspace/quotes/popular/quote-9.utf8 ./workspace/quotes/popular/quote-9.utf8.out ./workspace/quotes/quote-6.utf8 ./workspace/quotes/quote-6.utf8.out ./workspace/quotes/quote-8.utf8 ./workspace/quotes/quote-8.utf8.out ``` You can then compare `quote-8.utf8` with `quote-8.utf8` to see the text received as input (from the web service) and the text produced as output (by your program). ### Tasks Here is the proposed list of tasks to achieve the objectives: 1. Start by forking and cloning this repo (**mandatory!!**).