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Note:

You can download an AEM package that contains code and the OSGi bundle that are used in this article. Download the package and deploy using package manager. The purpose of this code is to show the community these concepts in action. That is, it's to illustrate how to write an OSGi bundle that contains a custom sling servlet that uses com.day.cq.dam.api.AssetManager API to work with digital assets. The objective of this community code is for teaching purposes only and not meant to go into production as is.

You can view the sample community application by using the following URL: http://localhost:4502/content/UploadAssetManager.html (assuming you deploy on author).
Before running this example, be sure to create the following path in the AEM JCR: /content/dam/travel.

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You can create an Adobe Experience Manager (AEM) application that lets a user select a file from their local desktop and upload it to AEM Digital Asset Manager (DAM). The file is posted to a custom Sling Servlet that persists an image file in the AEM DAM.

An Adobe Experience Manager client web page that lets a user select a file and upload it to the AEM DAM

In this example, notice that a file named lake.jpg is selected. Once the file is uploaded, the Sling Servlet persists the file in the AEM DAM, as shown in the following illustration.

A file is located in the AEM DAM that was uploaded using a Sling Servlet and AssetManager API

Note:

Before following along with this development article, create a folder in the AEM DAM named travel located at /content/dam/.

When you use the AssetManager API to persist a file in the AEM DAM, AEM automatically creates different renditions for the asset, as shown in this illustration.

This development article walks you through how to create this AEM application that lets a user select and upload a file to the AEM DAM. Once uploaded, the Java Sling Servlet places the file into the AEM DAM using the AssetManager API.

Note:

This development article dicusses how to create a page component that lets the user choose a file to upload to the AEM DAM. In contrast, you can create a Java application using the AssetManger API that uploads multiple files to the AEM DAM. For information, see http://helpx.adobe.com/experience-manager/using/multiple-digital-assets.html.

Create an Experience Manager application folder structure

Create an Experience Manager application folder structure that contains templates, components, and pages by using CRXDE Lite.

The following describes each application folder:

• application name: contains all of the resources that an application uses. The resources can be templates, pages, components, and so on.
• components: contains components that your application uses.
• page: contains page components. A page component is a script such as a JSP file.
• global: contains global components that your application uses.
• template: contains templates on which you base page components.
• src: contains source code that comprises an OSGi component (this development article does not create an OSGi bundle using this folder).
• install: contains a compiled OSGi bundles container.
  

To create an application folder structure:

1. To view the welcome page, enter the URL http://[host name]:[port] into a web browser. For example, http://localhost:4502.
2. Select CRXDE Lite.
3. Right-click the apps folder (or the parent folder), select Create, Create Folder.
4. Enter the folder name into the Create Folder dialog box. Enter slingFile.
5. Repeat steps 1-4 for each folder specified in the previous illustration.
6. Click the Save All button.
   

Note:

You have to click the Save All button when working in CRXDELite for the changes to be made.

You can create a template by using CRXDE Lite. An AEM template enables you to define a consistent style for the pages in your application. A template comprises of nodes that specify the page structure. For more information about templates, see Templates.

To create a template, perform these tasks:

1. To view the welcome page, enter the URL http://[host name]:[port] into a web browser. For example, http://localhost:4502.

2. Select CRXDE Lite.

3. Right-click the template folder (within your application), select Create, Create Template.

4. Enter the following information into the Create Template dialog box:

• Label: The name of the template to create. Enter templateUpload.
• Title: The title that is assigned to the template.
• Description: The description that is assigned to the template.
• Resource Type: The component's path that is assigned to the template and copied to implementing pages. Enter slingFile/components/page/templateUpload.
• Ranking: The order (ascending) in which this template will appear in relation to other templates. Setting this value to 1 ensures that the template appears first in the list.

5. Add a path to Allowed Paths. Click on the plus sign and enter the following value: /content(/.*)?.

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6. Click Next for Allowed Parents.

7. Select OK on Allowed Children.

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Create a render component that uses the template

Components are re-usable modules that implement specific application logic to render the content of your web site. You can think of a component as a collection of scripts (for example, JSPs, Java servlets, and so on) that completely realize a specific function. In order to realize this functionality, it is your responsibility as an AEM developer to create scripts that perform specific functionality. For more information about components, see Components.

By default, a component has at least one default script, identical to the name of the component. To create a render component, perform these tasks:

1. To view the CQ welcome page, enter the URL http://[host name]:[port] into a web browser. For example, http://localhost:4502.

2. Select CRXDE Lite.

3. Right-click /apps/slingFile/components/page, then select Create, Create Component.

4. Enter the following information into the Create Component dialog box:

• Label: The name of the component to create. Enter templateUpload.
• Title: The title that is assigned to the component.
• Description: The description that is assigned to the template.

5. Select Next for Advanced Component Settings and Allowed Parents.

6. Select OK on Allowed Children.

7. Open the slingTemplateJCR.jsp located at: /apps/slingFile/components/page/templateUpload/templateUpload.jsp.

8. Enter the following JSP code.

You can use Maven to build an OSGi bundle that contains a Sling Servlet. Maven manages required JAR files that a Java project needs in its class path. Instead of searching the Internet trying to find and download third-party JAR files to include in your project’s class path, Maven manages these dependencies for you.

You can download Maven 3 from the following URL:

http://maven.apache.org/download.html

After you download and extract Maven, create an environment variable named M3_HOME. Assign the Maven install location to this environment variable. For example:

C:ProgramsApacheapache-maven-3.0.4

Set up a system environment variable to reference Maven. To test whether you properly setup Maven, enter the following Maven command into a command prompt:

%M3_HOME%binmvn -version

This command provides Maven and Java install details and resembles the following message:

Java home: C:ProgramsJava64-6jre
Default locale: en_US, platform encoding: Cp1252
OS name: 'windows 7', version: '6.1', arch: 'amd64', family: 'windows'

Note:

For more information about setting up Maven and the Home variable, see: Maven in 5 Minutes.

Next, copy the Maven configuration file named settings.xml from [install location]apache-maven-3.0.4conf to your user profile. For example, C:Usersscottm.m2.

You have to configure your settings.xml file to use Adobe’s public repository. For information, see Adobe Public Maven Repository at http://repo.adobe.com/.

The following XML code represents a settings.xml file that you can use.

You can create an Experience Manager archetype project by using the Maven archetype plugin. In this example, assume that the working directory is C:AdobeCQ.

Default files created by the Maven archetype plugin

To create an Experience Manager archetype project, perform these steps:

1. Open the command prompt and go to your working directory (for example, C:AdobeCQ).

2. Run the following Maven command:

mvn archetype:generate -DarchetypeRepository=https://repo.adobe.com/nexus/content/groups/public/ -DarchetypeGroupId=com.day.jcr.vault -DarchetypeArtifactId=multimodule-content-package-archetype -DarchetypeVersion=1.0.2 -DgroupId=com.adobe.cq.sling.upload -DartifactId=upload -Dversion=1.0-SNAPSHOT -Dpackage=com.adobe.cq.sling.upload -DappsFolderName=myproject -DartifactName='My Project' -DcqVersion='5.6.1' -DpackageGroup='My Company'

3. When prompted for additional information, specify Y.

4. Once done, you will see a message like:
[[INFO] Total time: 14:46.131s
[INFO] Finished at: Wed Mar 27 13:38:58 EDT 2013
[INFO] Final Memory: 10M/184M

5. Change the command prompt to the generated project. For example: C:AdobeCQupload. Run the following Maven command:
mvn eclipse:eclipse

After you run this command, you can import the project into Eclipse as discussed in the next section.

Add Java files to the Maven project using Eclipse

To make it easier to work with the Maven generated project, import it into the Eclipse development environment, as shown in the following illustration.

The next step is to add a Java file to the com.adobe.cq.sling.upload package. The Java class that you create in this section extends the Sling class named org.apache.sling.api.servlets.SlingAllMethodsServlet. This class supports the doPost method that lets you submit data from an AEM web page to the Sling servlet. In this example, a file is uploaded from an AEM web page to the sling servlet.

For information about this class, see Class SlingAllMethodsServlet.

Create a Java class named HandleDamFile that extends org.apache.sling.api.servlets.SlingAllMethodsServlet. Within the doPost method, create Java Sling application logic that reads the file that is uploaded to the Sling servlet. The fully qualified names of the Java objects are used so you understand the data types used in this code fragment.

The uploaded file is placed into an InputStream instance named stream. Next, the uploaded file is written to the AEM DAM using the AssetManager API. The following Java code represents a method named writeToDam. This method uses the AssetManager API to place the file into the following DAM location:

/content/dam/travel

The writeToDam method accepts the InputStream instance (the uploaded file) and the uploaded file name as parameters.

The following Java code represents the HandleFile class that extends org.apache.sling.api.servlets.SlingAllMethodsServlet.

The Java class uses a SlingServlet annotation:

@SlingServlet(paths='/bin/updamfile', methods = 'POST', metatype=true)

The paths property corresponds to the URL that you specify when using an AJAX request. That is, to use an AJAX request to post data to this Sling Servlet, you use this syntax:

//Use JQuery AJAX request to post data to a Sling Servlet
$.ajax({
type: 'POST',
url:'/bin/updamfile',
processData: false,
contentType: false,
data:formData,
success: function(msg){
alert(msg); //display the data returned by the servlet
}
});

Notice that the url in the AJAX request maps to the path property in the SlingServlet annotation. The type in the AJAX request maps to the methods property in the SlingServlet annotation. Finally notice that the AJAX request specifies the form data that is submitted. The uploaded file is located in the formData variable.

Note:

This AJAX request is used in the client web page that is created later in this development article.

Modify the POM files to successfully build the OSGi bundle that contains the Sling servlet. In the POM file located at C:AdobeCQupload, add the following dependencies.

• org.apache.felix.scr
• org.apache.felix.scr.annotations
• org.apache.jackrabbit
• org.apache.sling

The following XML represents this POM file.

Build the OSGi bundle by using Maven. When Maven builds the bundle, it also creates a serviceComponents.xml file based on the annotations that are included in the com.adobe.cq.slingupload.HandleFile class. The following XML represents this file.

Notice that the implementation class element specifies com.adobe.cq.sling.upload.HandleFile. This lines up with the Java class that extends org.apache.sling.api.servlets.SlingAllMethodsServlet that was created in an earlier step.

To build the OSGi component by using Maven, perform these steps:

1. Open the command prompt and go to the C:AdobeCQupload folder.
2. Run the following maven command: mvn clean install.
3. The OSGi component can be found in the following folder: C:AdobeCQuploadbundletarget. The file name of the OSGi component is upload-bundle-1.0-SNAPSHOT.jar.
   

Once you deploy the OSGi bundle, you can upload a JPG file to the Sling Servlet (this is shown later in this development article). After you deploy the OSGi bundle, you will be able to see it in the Apache Felix Web Conole.

Deploy the OSGi bundle that contains the Sling Servlet by performing these steps:

1. Login to Apache Felix Web Console at http://server:port/system/console/bundles (default admin user = admin with password= admin).
2. Click the Bundles tab, sort the bundle list by Id, and note the Id of the last bundle.
3. Click the Install/Update button.
4. Browse to the bundle JAR file you just built using Maven. (C:AdobeCQuploadbundletarget).
5. Click Install.
6. Click the Refresh Packages button.
7. Check the bundle with the highest Id.
8. Click Active.
9. Your new bundle should now be listed with the status Active.
10. If the status is not Active, check the CQ error.log for exceptions.

Add JQuery files to a CQ:ClientLibraryFolder node

Add the JQuery framework file to a cq:ClientLibraryFolder node. The JQuery framework file that is added is named jquery-1.6.3.min.js.

To add the JQuery framework to your component, add a cq:ClientLibraryFolder node to your component. After you create the node, set properties that allow the JSP script to find the JQuery library file.

Text files

Add a text file to the clientlibs folder that maps to the JQuery JS file. The name of the text file is js.txt. The js.txt file contains the JS JQeury file name: jquery-1.6.3.min.js.

1. Right-click /apps/slingFile/components then select New, Node.
2. Make sure that the node type is cq:ClientLibraryFolder and name the node clientlibs.
3. Right click on clientlibs and select Properties. Add the two properties specified in the previous table to the node.
4. On your file system, navigate to the folder where the JQuery JS file is located. Drag and drop the jquery-1.6.3.min.js file to the clientlibs node by using CRXDE.
5. Add a TXT file to the clientlibs folder named js.txt. The content of the js.txt file is the JQuery JS file name.

Modify the templateUpload JSP to post a file to the Sling Servlet

Modify the templateUpload.jsp file to post a file to the Sling Servlet that was created in this development article. In this example, a JQuery AJAX Post request is used and the file is posted to the Sling Servlet's doPost method (the method defined in the HandleDamFile Java class).

The following code represents the AJAX request.

$.ajax({
type: 'POST',
url:'/bin/updamfile',
processData: false,
contentType: false,
data:formData,
success: function(msg){
alert(msg); //display the data returned by the servlet
}
});

IN AEM 6.x, you need to use the out of the box JQuery library to handle the required CSRF token. If you do not use use this, you will receive a 403 HTTP error when you attempt to post a file to the AEM Sling servlet using an AJAX request. To successfully post a file, ensure that you use this line of code in your JSP.

<cq:includeClientLib categories='cq.jquery' />

The following code represents the JSP for AEM 6.x. Notice that the url specifies the value of the path attribute in the SlingServlet annotation defined in the HandleDamFile method.

Notice that the url specifies the value of the path attribute in the SlingServlet annotation defined in the HandleDamFile method.

Modify the templateUpload JSP file

1. To view the CQ welcome page, enter the URL: http://[host name]:[port] into a web browser. For example, http://localhost:4502.
2. Select CRXDE Lite.
3. Double-click /apps/slingFile/components/page/templateUpload/templateUpload.jsp.
4. Replace the JSP code with the new code shown in this section.
5. Click Save All.

Create a web page that lets users upload files to the DAM

The final task is to create a site that contains a page that is based on the templateUpload (the template created earlier in this development article). When the user selects a file and submits it, the file is persisted in the Experience Manager DAM.

Create a web page that lets users upload files to the Experience Manager DAM:

1. Go to the Websites page at http://localhost:4502/siteadmin#/content.
2. Select New Page.
3. Specify the title of the page in the Title field.
4. Specify the name of the page in the Name field.
5. Select templateUpload from the template list that appears. This value represents the template that is created in this development article. If you do not see it, then repeat the steps in this development article. For example, if you made a typing mistake when entering in path information, the template will not show up in the New Page dialog box.
6. Open the new page that you created by double-clicking it in the right pane. The new page opens in a web browser.

Congratulations, you have just created an AEM OSGi bundle that contains a sling servlet by using an Adobe Maven Archetype project. Please refer to the AEM community page for other articles that discuss how to build AEM services/applications by using an Adobe Maven Archetype project.

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