Bonus-Java-Server

Java Server

The training wheels are coming off....sort of. In this lab, I set up the basic server for you. Your task is to handle other type of responses. You can refactor the code however you see fit and I highly advise you to do so.

Read the wiki page HTTP and figure out how to write the response for each of the request. I wrote a sample one for you to see. In src/main/java/Main.java, run the main method. Once the server is up, go http://localhost:5000, note it says Hello world.

Your task for this lab is to read the HTTP and figure out how to generate the proper response. Remember to write unit test.

Notes

I will not answer the following questions:

• What is a HTTP?
• How do I construct an HTTP response?
• What's an HTTP method?
• What's an HTTP code?

If you come to me, I will show you LMGTFY(Let me google that for you). I will answer anything related to why your code doesn't work. I will also answer design related questions. I will also help you construct the test if you know what message you want to write.

Text response

1. Add a /hello path so when I go to http://localhost:5000/hello, I will see world as the response
2. Add a /form?key=value path so when I go to http://localhost:5000/form?key=value I will see the value as the response. For example if I call /form?search=blue, the server will return blue. If I call /form?color=red, the server will return red. The response code should be 201.
3. Add a /404 path so when I go to http://localhost:5000/404 I will see the Are you lost? message with a 404 response code.
4. Edit the /form?key=value path so it will only response if it is a POST request. Any other type of request will a 404 response.

Redirect

1. Add a /redirect path so when I go to http://localhost:5000/redirect I will be redirect to http://google.com

Asynchronous requests

Currently our server can handle one request at a time. This is called Synchronous. We want multiple users to access the server at the same time. This is called Asynchronous. Read up on the term here.

1. In the run method of the RequestHandler, add Thread.sleep(5000); before the try and catch to make your server go to sleep for 5s before processing your request.
   1. Open up your browser and go to http://localhost:5000
   2. Open another tab and go to http://localhost:5000
   3. Note how long it takes for the second to get a response. That's because it has to wait for the first one to complete, then it will process the second request.
2. Look into the ExecutorService to see how you can use it to handle asynchronous requests

Image response

Part 1

1. Add a new file in the resources folder
2. Add a new path /files/[image_name] (e.g. /files/high5.gif) will show the image

Part 2

1. Add a /files path. The files path will list out all the files in the src/main/resources folder in a list.
2. Clicking on any of the file names will display the content of the file. If it is a picture, then show it as a picture.

Bonus - ORM

1. Add ORMlite with a mysql database to your dependencies
2. Add a User class with two fields long id and String name
3. Add the dao necessary to create retrieve the user
   1. Create 3 users
4. Add a /users path to display all the users name in a list.
5. Add a /users/1 to show information for the first user (their name and id)

Super bonus

1. Add a /users/new path to show a form where user can enter a name to create a new user.
2. Add a /users with a POST method to accept the form information and create the user. Redirect to /users/[user_id]