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Announcements

Announcements. Homecoming Engineering Tailgate Extravaganza Students need to register by October 21 st Actual game is October 29 th $10 Lunch, $15 for Lunch + Ticket 300 tickets available Now selling t-shirts and dues $10.00 Dues = Free T-Shirt!. Announcements. Speakers Dr. Gary Leavens

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Announcements

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  1. Announcements • Homecoming Engineering Tailgate Extravaganza • Students need to register by October 21st • Actual game is October 29th • $10 Lunch, $15 for Lunch + Ticket • 300 tickets available • Now selling t-shirts and dues • $10.00 Dues = Free T-Shirt!

  2. Announcements • Speakers • Dr. Gary Leavens • Next week! • Florida Interactive Entertainment Academy • October 20th • Then social!

  3. APIs and You! Shane Chism, 2011

  4. What’s an API? • Application Programming Interface • Serves as an interface between different software programs and facilitates their interaction • (I want your data) + (You don’t trust me) = API • Implements multiple concepts • Object based requests • JSON / XML • Authentication Shane Chism, 2011

  5. How is a request made?

  6. How is a request made? • Multiple methods of making an API request • A request can simply be defined: • Client communicates a request to a Server • For our purposes, we’ll focus on URL based requests Example: GET https://graph.facebook.com/{userId}  Shane Chism, 2011

  7. Object Based Requests • APIs can be simple or powerful • Consider an API that only serves the time • Consider an API that translates to and from any language • Object Oriented requests make requesting complex data easy: GET https://graph.facebook.com/chism/posts • This returns all posts for user “chism” • Our main object is the user (chism). posts is our “connection,” a collection of child objects Shane Chism, 2011

  8. How do I use this data?

  9. How do I use this data? • The API server has no clue what context you’re requesting from • Web app? Desktop app? C? C#? PHP? Java? Whitespace? • It needs to send a response that can be read by any language in any context • Solution: XML!Right? …. Right? …….. Shane Chism, 2011

  10. JSON • XML is cool. • It’s traditionally been used to do what JSON is doing • Send data in a way where we can convert it into usable data structures • JSON is cooler. (opinion, but backed with facts!) • It does what XML does, but it’s much lighter weight Shane Chism, 2011

  11. JSON vs. XML

  12. JSON • Computers can read JSON fairly easily • Getting the data into the data structure, however, isn’t as fun • In PHP: • json_decode( $jsonString, true ); • Produces an associative array with proper variable types • In Java: …. Not as fun. Shane Chism, 2011

  13. JSON • Decoding JSON in Java • You can use any number of open source libraries • We’ll be using GSON • Google JSON Decoder • The trick: We need to build a container for our JSON data Shane Chism, 2011

  14. JSON • Example: Decoding JSON in Java • Suppose this is our JSON response: • Our data structure would be: { "id": "1106460174" } classmy_JSON_Container { public String id; } Shane Chism, 2011

  15. JSON • Example: Decoding JSON in Java • Suppose this is our JSON response: • Our data structure would be: { "id": "1106460174”,  "name": "Shane Chism", } classmy_JSON_Container { public String id; public String name; } Shane Chism, 2011

  16. Reading JSON { "id": "1106460174", "name": "Shane Chism", "link": "https://www.facebook.com/chism", "username": "chism", "hometown": { "id": "109466215738919", "name": "Tierra Verde, Florida" }, "languages": [ { "id": "117976438273549", "name": "SQL" }, { "id": "177492448957188", "name": "CSharp" } ] } Strings String key = value

  17. Reading JSON { "id": "1106460174", "name": "Shane Chism", "link": "https://www.facebook.com/chism", "username": "chism", "hometown": { "id": "109466215738919", "name": "Tierra Verde, Florida" }, "languages": [ { "id": "117976438273549", "name": "SQL" }, { "id": "177492448957188", "name": "CSharp" } ] } Arrays Map<String,String>

  18. Reading JSON { "id": "1106460174", "name": "Shane Chism", "link": "https://www.facebook.com/chism", "username": "chism", "hometown": { "id": "109466215738919", "name": "Tierra Verde, Florida" }, "languages": [ { "id": "117976438273549", "name": "SQL" }, { "id": "177492448957188", "name": "CSharp" } ] } Nested Arrays Collection<Map<String,String>>

  19. MAKING THE CONNECTION

  20. Making the connection • In Java we use two pre-built classes: • URL • URLConnection • More on this in the tutorial… Shane Chism, 2011

  21. OAUTH Api authentication

  22. Authentication • Often times an API will need to know that we have permission to access user data • Google, Facebook (and many others) use a protocol called OAUTH • This is extremely important, but we won’t be tackling it in this tutorial • At first blush OAuth is very complex. Pace yourself! Shane Chism, 2011

  23. APIs and You! Shane Chism, 2011

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