Google App Engine allows users to develop and host web applications on Google's servers. It provides an integrated development environment called Eclipse to write applications using Java, Python or other languages. The application code and files are packaged and deployed to Google's servers. When requests come in, the web.xml file maps URLs to servlet classes which handle the requests. The appengine-web.xml file provides configuration details like the application ID. Applications can be tested locally and then deployed to the cloud with a single click from within Eclipse. Once deployed, applications are accessible via a URL based on the registered application ID.

1. Google App Engine

2. Developed by:
Shreyash Gupta
5th
CE-1
110400107034
Google App Engine

3. What are Google apps?
• Apps is a form Short of application. An app is
a piece of software. It can run on the Internet,
on your computer, or on your phone or other
electronic device.
• Google refers to their online services as apps,
but they also sell a specific suite of services
known as Google Apps and have an
application hosting service called Google
Appengine.

4. What is google appengine?
• Google App Engine is a way to write your own Web
applications and have them hosted on Google
servers.
• Google Apps can be found on the Web at
“www.google.com/a”
• And Google App Engine can be found on the Web at
“code.google.com/appengine”.

5. Cont…
•You can serve your app using a free
name on the appspot.com domain. You
can share your application with the
world, or limit access to members of
your organization.

6. How to make Google app?
• To make google app we need following
1. eclipse
2. google plugin for eclipse

7. Eclipse
• Eclipse is a multi-language software development environment
which is made an integrated development environment (IDE) and
an extensible plugin system. It is written mostly in java and can be
used to develop applications in Java and, by means of various plug-
ins, other programming language including C, C++ etc.

8. How to download eclipse?
• Eclipse is an open source software .
• Its different versions are easily available on internet .
• http://www.eclipse.org/downloads/
• To download eclipse first you have to install java run time
environment.

9. Installing eclipse:
• Go to the site:
• http://www.poweredbypulse.com/eclipse_packages_win.php
• Select the eclipse version 3.6

10. Installing eclipse classic:

11. Step1:Check Google plugin for eclipse

12. Step2:click on install button

13. Installation started:

14. Plugin installed:

15. Creating web application project

16. Creating new web application project:

17. Project created:

18. The Project Directory
• A single directory named
Project_Name/ for all project
files.
• Subdirectory named src/
contains the Java source
code
• Subdirectory named war/
contains the complete
application arranged in the
WAR format.
• Build process compiles the
Java source files and puts
the compiled classes in the
appropriate location in war/

19. The servlet class:
• App Engine Java applications use the Java Servlet API to interact
with the web server.
• An HTTPservlet is an application class that can process and
respond to web requests.
• Servlet class extends either the javax.servlet.GenericServlet class
or the javax.servlet.http.HttpServlet class.

20. Servlet class:

21. The web.xml File:
• When the web server receives a request, web.xml file is used to
determines which servlet class to call
• web.xml resides in the war/WEB-INF/ directory
• web.xml file declares a servlet named Yusra, and maps it to the
URL path /yusra
• whenever the user fetches a URL path that is not already mapped to
a servlet, the server should check for a file named index.html in
that directory and serve it if found.

22. Xml file:

23. The appengine-web.xml File
• This file is named appengine-web.xml, and resides in WEB-INF/
alongside web.xml
• It includes:
– The registered ID of your application (Eclipse creates this with an
empty ID for you to fill in later),
– The version number of your application,
– Lists of files:
• Static files (such as images and CSS) and resource files (such as JSPs and
other application data)

24. appengine-web.xml file:

25. Running the project:
• The App Engine SDK includes a web server application
you can use to test your application
• Steps:
– Make sure the project (“Yusra") is selected,
– Right click and select Run As menu
– Select Web Application
• This should start Jetty on http://localhost:8888/

27. Testing the Application:

28. Deploying Application:
• Now deploy your application to the Google cloud
• You must have a google mail account
• Give application ID to you application
– Application ID will be stored in file (“appengine-web.xml”
• First you will have to register application on google cloud
– Using the same application ID
• Then perform deploying operation

29. Registering the Application
1. App Engine Administration Console, at the following
URL:
https://appengine.google.com/
2. Sign in to App Engine using your Google account
3. To create a new application:
a) Click the "Create an Application" button
b) Follow the instructions to register an application ID, a name unique
to this application
c)If you select to use the free appspot.com domain name, the full URL for
the application will be http://application-id.appspot.com/

30. Sign in to gmail account:

32. Uploading From Eclipse
• To upload your application from Eclipse, click the App Engine
deploy button on the toolbar
• Click the Deploy button
• Enter your Google account username (your email address) and
password when prompted
• Eclipse gets the application ID and version information from the
appengine-web.xml file, and uploads the contents of the war/
directory.

33. Deploying project:

34. Click on deploy button:

35. Deployment started:

36. Accessing Your Application
• You can now see your application running on App Engine
• If you set up a free appspot.com domain name, the URL for your
website begins with your application ID:
http://application-id.appspot.com/
• In our example it will be
http://hiyzfriends.appspot.com/yusra

37. Uploaded successfully: