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Cloud service and gae for java(gae:j)
- 1. Cloud Service and GAE for Java(GAE/J) Speaker: Roy Chen
- 2. outline • 1. What’s Cloud Service? • 2. PaaS features (GAE) • 3. IaaS features (EC2) • 4. Comparison: PaaS and IaaS • 5. implement and deme a tiny Project (目標: • gae/j 開發環境設置 • 、基本jave web(servlet, jsp) • 、將專案deploy到google gae)
- 4. Cloud Service Because a lot of demand for cloud computing, and technologies of cloud is getting better, many companies have released some services that basic on Cloud, we called it “Cloud Service”. • Web service (Amazon EC2, GAE…) • Storage (Amazon s3, hicloud s3, Google Cloud Storage…) • Music, movie (itunes)
- 5. 3-layer in Cloud Service Web browser, mobile app… SaaS (Software as a Service) PaaS (Platform as a Service) IaaS (Infrastructure as a Service)
- 7. Explore features! PaaS - GAE 1. Api 2. Auth 3. Monitoring – Logs 4. Storage 5. …
- 8. 1. Support some useful APIs Based on PaaS, GAE support many useful APIs For developers Such as mail, map, youtube, and most powerful is auth!
- 9. 2. OAuth2.0 Think about this Scenario: Your app(third party) wants to access user’s photo placed in Google Storage, The safest way is by Oauth, but how the Oauth do it? If you Use a non-OAuth app… WHAT CONSEQUENCES YOU WILL ENCOUNTER???
- 10. 3. Monitoring – Logs You don’t need to implement a log record system, GAE provides you a log control panel which has a pretty UI, and useful filter.
- 11. 4. Storage Store and manage data using a fully-managed, relational MySQL database Cloud Datastore provides a managed, NoSQL, schemaless database for storing non-relational data. provides developers and IT teams with secure, durable, highly-scalable object storage. with a simple web services interface to store and retrieve any amount of data from anywhere on the web.
- 13. IaaS example – Amazon EC2
- 14. IaaS example – Amazon EC2
- 15. Instagram
- 16. Comparison: PaaS and IaaS PaaS IaaS Google App Engine (GAE) Microsoft Azure Amazon EC2 Good Part of PaaS: machine and software configurations has been set, moreover, the vendor may provide many good api for you. Bad Part: you need to allow the vender’s rules of environments settings, programming languages, db. And PaaS project has bad portability and hard to rework.
- 17. Good stuff… GCE I prefer to use IaaS production, but I hate AWS, I want to use Google production! Let me show you something good!
- 20. 2 ways to set ur dev environment • 1. use MAVEN • 2. use eclipse
- 21. The Google App Engine SDK and Maven • When you use Maven, you don't need to download the Google App Engine SDK. Maven does that for you. You'll also use Maven to test your app locally and upload (deploy) it to production App Engine.
- 22. Getting Eclipse
- 23. Installing the Google Plugin for Eclipse
- 24. 環境設置完成
- 25. Creating a project Click Web Application Project
- 27. 測試一下
- 28. 成功
- 29. 新增html
- 30. 設定router
- 31. Front-end
- 34. 把預設的servlet改成這樣
- 36. Apply gae service • 接下來要上傳到GAE SERVER，但在這之前 你需要去google開發者網站一下。 • https://console.developers.google.com/projec t • 直接使用您原本的gmail帳號即可，將gae的 服務打開。
- 39. • 去 appengine-web.xml • 把application tag中間加上你的id • <application>oh20141030</application>
Editor's Notes
- 因為雲端計算的需求越來越多，和一些技術的純熟，很多公司都推出了一些基於雲端的服務，統稱為雲端服務，雲端服務又可細分很多種， 像是web相關的服務，Amazon, Google, MS…等非常多大大小小的公司都有在做web service, 很多大小公司把它們的server host在這些服務上，所以他們只要專心於開發就好，除了省時間，也可以少請幾位Msi，節省成本。 另外一種像是雲端儲存服務，就是儲放檔案的空間，像以前很多人會自己架server讓別人用ftp抓東西，現在可以不用自己架，用一些大公司提供的雲端儲存服務就可以了，而且一些新的儲存雲服務除了使用依傳統的ftp作為client之外，還支援REST API的方式存取資料，REST API簡單來講就是把HTTP的GET POST PUT DELETE寫成api的方式，讓client user可以更簡單的存取server資源。 通常 web service跟 Storage service會它配再一起用，比如說像一個類似instragram的專案，他的web server可能就會使用ec2，然後再使用amazon s3去存取圖片。 另外像是提供音樂影片的服務也算是雲端服務的一種，最有名的應該就是apple的 itunes。
- 上一張是簡單介紹雲端服務的種類，這裡則是要介紹雲端服務的階層，雲端服務主要是三層，就是這張投影片我用藍色圈起來的部分，至於最上面那層是client，不屬於雲端服務，就是我們用戶端，像是瀏覽器，或是app之類的， 那我們就來看雲端服務的第一層，應應層，這層跟這次主題GAE並沒有太大關聯，這層主要是直接提供軟體給客戶用，只是說軟體不是放在client，是放在某個cloud server上，像是Facebook, google map, youtube都是此層的應用。 接下來是platform跟infrastructure的這兩層就跟應用層有很明顯的差別了，下面這兩層主要是給開發者使用，也是跟這次主題GAE最有關連的兩層， 先看platform這層，這一層主要提供平台服務，這個平台有廠商提供給你的設備，還有廠商幫你設置好的Server，甚至連你可能會用到的API都幫你寫好了，開發者需要遵循廠商的部署規範，和api的使用方法來開發你的專案，最後在放上平台運作。使用這個架構來提供服務的有 Google的gae，也就是這次的主題，和MS azure。 接著要看的是infrastructure這層，這層翻譯較基礎建設，但這樣講很怪，簡單來說就是提供你主機跟設備還有網路等等，至於要跑什麼軟體，做什麼服務都是你自己決定的，可以把它想像成廠商直接提供你一台乾淨的windows或是osx 或是linux，讓你遠端連過去用。有名的像是Amazon的ec2。
- 額 前面有說到PaaS的服務會幫你把serer設置好，你需要的只是遵守開發商的佈署規則，和遵循開發商釋出的api呼叫方法，就可以開發你的專案了，在這裡我要開始介紹GAE的一些特色，但其實GAE可以使用的東西實在太多，在這次的分享講不完，所以我會快速的帶過幾個比較常見的特色，讓大家更了解GAE是在幹什麼。
- 因為GAE是PaaS的一種，所以它幫妳寫好很多API讓你方便使用，你省了很多時間自己寫。 舉例像是gmail的api，
- Oauth的機制可以讓user更安心地把存取資料的權限交給第三方的應用程式，舉個例子，當有app要存取你fb的圖片時，你的帳號密碼經過這個app，而是給app一個token，類似金鑰的東西，這樣就不用擔心你的個資在經過別人的server時被偷存起來。 Facebook twitter google等大廠都有使用這個機制，那GAE提供了方便使用的api，讓你的專案可以使用Oauth這個東c 像金流的網站幾乎都有用到這個機制，好處是你線上付款時，你的個資 你的卡號 不會經過賣家的server 例子 你做了一個app，功能是取得你用戶fb的照片，這個app不需要用戶索取帳號跟密碼，app需要的是一組token，此時app會去跟fb server要token，fb server認證你這個app是合法的之後，fbserver會給app一組token，app就可以用token去跟fb索取你的照片， 它強大的地方式在於，每組token都有特定的功用，比如說 app想要拿到你的相簿，它需要有一組專門取得相簿的token，如果app想要拿到你設為隱私的留言，app就需要一組專門取得隱私留言的token，除此之外，每個token都有它的有效期限，可能是幾小時或者是幾天。 使用Oauth機制的服務，使用者會很安心，這也就是為什麼很多應用程式的登入都直接拿fb, twitter google+的來用。 那如果你想要自己做登入系統，GAE提供了API讓你很方便的使用Oauth。
- http://instagram-engineering.tumblr.com/ PaaS 優點 硬體軟體都幫你設定好，甚至提供了很多實用的api，比IaaS能更快的進入開發狀態。 缺點 必須遵照PaaS開發指定的某些開發環境、程式語言、資料庫，而且專案到後期太依賴開發商給的api，移植性變得不容易，rework也相對難。
- 其實google在2008先推出PaaS的GAE，amazon則是在2006推出IaaS的EC2，但google發現這樣不行cloud service的市占率都被amazon拿走了，於是google在2012推出了跟ec2很像的GCE，要來pk， 至於gae跟gce哪個好，其實都很好，看需求決定要用什麼。 對了 google跟amazon在台灣都有data center，所以速度都很快。
- The Eclipse IDE is available in several packages. The "Eclipse IDE for Java EE Developers" package includes all of the components you will need for web application development. In addition to the Google Plugin for Eclipse, we recommend the Eclipse Web Tools Platform (WTP) plugins for web development. Among other things, WTP provides editing modes for JSP and HTML files. Eclipese版本有很多，你要去下載的是Eclipse IDE for Java EE Developers，這個版本包含一些寫java web需要用到的東西 //Luna…月神
- Start Eclipse Select Help > Install New Software... In the dialog that appears, enter the update site URL into the Work with text box: https://dl.google.com/eclipse/plugin/4.4 And press the enter key. 只需要安裝 Google Plugin for Eclipse(required) 和 SDK -> Google App Engine Java SDK (1.9.4), 這兩個即可，但如果你很熟悉用dreamweaver這種拖拉式的網頁ide來寫網頁的話，你可以考慮安裝 Google web toolkit SDK 2.6.0，有了它，你要radio btn, table, div, inputbox,都可以直接拖拉來完成。
- Using the Google Plugin for Eclipse It's easy to use the Eclipse development environment to develop your Java App Engine application, just as you can to develop any other servlet-based web application. With the Google Plugin for Eclipse, it's even easier. The plugin lets you create, test, and upload App Engine applications from within Eclipse. You can also import an App Engine application packaged as a Maven project, and let Eclipse use Maven to manage dependencies and builds. (For more information, see Using Apache Maven.) The Google Plugin for Eclipse also makes it easy to develop applications using Google Web Toolkit (GWT), to run on App Engine or in any other environment. This article describes how to install the Google Plugin for Eclipse, create or import a new App Engine project, and debug it using the development server running within Eclipse. The article also describes how to use the plugin to upload your project to App Engine. For more information about the plugin, including how to use it for Google Web Toolkit projects, see the Google Plugin for Eclipse documentation. Getting Eclipse Installing the Google Plugin for Eclipse Creating a project Importing a Maven project Running the project Uploading to Google App Engine Running the command line tools Getting Eclipse The Eclipse IDE is available in several packages. The "Eclipse IDE for Java EE Developers" package includes all of the components you will need for web application development. In addition to the Google Plugin for Eclipse, we recommend the Eclipse Web Tools Platform (WTP) plugins for web development. Among other things, WTP provides editing modes for JSP and HTML files. Installing the Google Plugin for Eclipse To use the plugin you must be running Java version 7 and a recent version of Eclipse. You can install the Google Plugin for Eclipse using the software update feature of Eclipse. Be sure to use the plugin that corresponds to your version of Eclipse. Follow the installation instructions provided at the links below or, if you are familiar with installing Eclipse plugins, you can simply paste the appropriate plugin link directly into Eclipse. Eclipse versionInstallation instructionsDirect plugin linkEclipse 4.4 (Luna)Plugin for Eclipse 4.4 (Luna)https://dl.google.com/eclipse/plugin/4.4Eclipse 4.3 (Kepler)Plugin for Eclipse 4.3 (Kepler)https://dl.google.com/eclipse/plugin/4.3Eclipse 3.8/4.2 (Juno)Plugin for Eclipse 3.8/4.2 (Juno)https://dl.google.com/eclipse/plugin/4.2If you are looking for older versions of the plugin, click here. If you are having trouble installing from the update sites (due to firewall issues, for instance), please see this FAQ entry. As an alternative to installing from the update site, you can install the Google Plugin for Eclipse by downloading and installing an archive of the update site. Creating a project To create a new App Engine project: Select the File menu > New > Web Application Project . If you do not see this menu option, select theWindow menu > Reset Perspective..., click OK, then try the File menu again. Alternatively, click the Google button in the Eclipse toolbar and select New Web Application Project. The "Create a Web Application Project" wizard opens. For "Project name," enter a name for your project, such as Guestbook for the project described in the Getting Started Guide. For "Package," enter an appropriate package name, such as guestbook. If you're not using Google Web Toolkit, uncheck "Use Google Web Toolkit." Verify that "Use Google App Engine" is checked. If you installed the App Engine SDK using Software Update, the plugin is already configured to use the SDKs that were installed. If you would like to use a separate installation of the App Engine SDK, clickConfigure SDKs..., and follow the prompts to add a configuration with your SDK's appengine-java-sdk/directory. Click Finish to create the project. The wizard creates a directory structure for the project, including a src/ directory for Java source files, and awar/ directory for compiled classes and other files for the application, libraries, configuration files, static files such as images and CSS, and other data files. The wizard also creates a servlet source file and two configuration files. The complete directory structure looks like this:
- 到這裡沒問題的話，表示你環境設置ok了，可以開始動工了!
- 瀏覽器輸入url，這個檔案會幫你找到哪個url應該對應到那些page，應該執行那些code。 可以把它想像成是路油表 router table，一四是，當有人對url-pattern裡的那段做出request時，servlet-mapping裡的servlet-name就會去找s
- MisterUniverseServlet.java 去增加一個do post
- Create jsp to shwo man 前端有種東西叫做表單 form，有一個屬性較method，method的值主要有四種，GET POST DELETE PUT，當你送出表單時，server side也就是 servlet要有相對應的method去接他，不然會有錯。 這段code是預設一個有著radio btn的表單Post到server時要做的事情， Req.gerParameter會把表單中name屬性為boy的值取出來，另一個就是下面req.setAttribute
- 先來看看 錢號跟一組中括號的那個東西，是JSP的特殊用法，它可以直接把servlet的變數印出來，通常會把它稱為ｓｌｏｔ， 印完之後，JSP會隨著被填滿的slot被render成html，再經由瀏覽器秀出來。