Google Facebook Java App
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Google Facebook Java App
Using the Google Plugin for Eclipse: Read about the GAE plug-in for Eclipse and how to install it. Add the static helper method shown in Listing 3 to the FacebookSignedRequest class to create the object:Listing 3. Leave the remaining options with their defaults. The secure canvas URL is the same as the canvas URL, except that https replaces http. .. RestFB: Download RestFB. Jump toSections of this pageAccessibility HelpPress alt + / to open this menuRemoveTo help personalize content, tailor and measure ads, and provide a safer experience, we use cookies. Facebook application basic settings dialogView image at full size Note the App ID and App Secret keys at the top of the screen (hidden in Figure 2). Subscribe me to comment notifications static.content.url= developmentArticleID=821916ArticleTitle=Java Facebook applications on Google App Enginepublish-date=06192012 developerWorks About Help Submit content Report abuse Third-party notice Community Product feedback Developer Centers Follow us Join Faculty Students Startups Business Partners Select a language English Portugus (Brasil) Espaol Tutorials & training Demos & sample code Q&A forums dW Blog Events Courses Open source projects Videos Recipes Downloads APIs Newsletters Feeds Contact Privacy Terms of use Accessibility Feedback Cookie Preferences . (See Related topics for a link to the complete list of available permission.)You can customize the look and feel of this page in the Settings > Auth Dialog page of the Facebook developer application. For this application, the canvas URL ends with a question mark to indicate that the parameters for the application will be passed in via the request URL sent to the application. Instead of writing the HTML for the content directly to the page, you could implement a more traditional Model-View-Controller (MVC) approach by using the standard RequestDispatcher.forward() call to a JavaServer Pages (JSP) page. Conclusion This article has demonstrated how to register, implement, and deploy a Facebook application in Java, hosted on the Google App Engine service. This article shows you how to register a Facebook application, develop it in Java, and deploy it for free on GAE for use by any logged-in Facebook user. RestFB provides a helper method StringUtils.join() to create the list correctly. This is included in the payload of the request only if the user has granted the application access to his or her profile. Learn about a specific product or take a course and get certified. I've omitted all appropriate get and set methods for clarity; they're included in the source-code download (see Download). By clicking or navigating the site, you agree to allow our collection of information on and off Facebook through cookies. First, you need to extract the OAuth token from the payload, using the SignedRequest class, as shown in Listing 4:Listing 4. Create a new class with the same signature as the definition in web.xml. Keep them private and do not allow other developers to use them, because they could be used maliciously without your knowledge. Listing 2 shows the source for the Java object of the signed request. (The URL for my app's servlet is so in Figure 2, I've entered for the canvas URL and for the secure canvas URL.) This is all you need to do to set up an application on Facebook, but it's a good idea to configure some of the other settings, such as the app's icon and its category, to modify how the application is presented to users.Register the application with GAE With the application now registered with Facebook, you'll next register it with GAE. With a valid OAuth token, you can create a DefaultFacebookClient from the RestFB library and use it to retrieve data from Facebook's Graph API using the fetchConnection() call. Thus, the URL of the profile picture is created by replacing User ID in the URL with the user ID from the User object. Deselect Use Google Web Toolkit. Enter an application domain in the App Domains field. After the application is compiled and uploaded to the server, you (and any other Facebook user) can install the application in Facebook at ID/ and see the results. Under Select how your app integrates with Facebook, select Website with Facebook Login and enter a site URL consisting of the GAE domain you entered in the App Domains field, preceded by (In Figure 2, I've entered The canvas URLThe canvas URL you specify in the basic settings for your app tells Facebook where to get the page code to populate the Canvas Page a blank canvas within Facebook where your application runs. Sign UpIts free and always will be.JavaScript is disabled on your browser.Please enable JavaScript on your browser or upgrade to a JavaScript-capable browser to register for Facebook.An error occurred. All in developerWorks communities. Again, the question mark at the end of the URL is important. Each User object in this list is used to create a line in the table of users the servlet will create. For example, in Figure 2, I entered myoldfacebookfriends.appspot.com. The platform initially supported a wide variety of programming languages including Java but now it provides native SDKs only for JavaScript and PHP (as well as support for applications on iOS and Android devices). View communities Featured Developer Centers Blockchain IBM Cloud WebSphere Application Server Featured destinations IBM Code Swift IBM API Explorer Cognitive Cloud Data Internet of Things Java All topics LearnJava development ContentsIntroductionRegistering the applicationDeveloping the applicationDeploying the applicationConclusionDownloadable resourcesRelated topicsComments Java Facebook applications on Google App EngineCreate, implement, and deploy a Facebook application on Google App Engine Mr Joseph McCarthyPublished on June 19, 2012 Launched in February 2004, Facebook is the world's largest social network, with more than 900 million users using the site to share content with their connected friends. Using the same PrintWriter object as before, write a table with a header row to the canvas:writer.print(" Photo Name Id "); Iterate through the list of User objects, as just described, then write a new row for this table, using the instance variables from each User object:for (List myFriendsList : myFriends) { for(User user: myFriendsList) writer.print(" " + " " + " " + user.getName() +" " + user.getId() + " "); } Finally, close the tag, and close the PrintWriter object to complete the servlet:writer.print(" "); writer.close(); Listing 7 shows the final servlet doPost() method:Listing 7. You pass the list of permissions an application needs to the authentication URL by adding each one to the scope request parameter 5a02188284
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