Sling Servlet
A Servlet is a class used to extend the capabilities of servers that host applications accessed by means of a request-response programming model. For such applications, Servlet technology defines HTTP-specific servlet classes.
All servlets must implement the Servlet interface, which defines life-cycle methods.
A servlet in AEM can be registered as OSGi service: you can extend SlingSafeMethodsServlet for read-only implementation or SlingAllMethodsServlet in order to implement all RESTful operations.
Servlet Code
package com.mysite.core.servlets;
import javax.servlet.Servlet;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingAllMethodsServlet;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import java.io.File;
import com.adobe.aemfd.docmanager.Document;
import com.adobe.fd.forms.api.FormsService;
@Component(service={Servlet.class}, property={"sling.servlet.methods=post", "sling.servlet.paths=/bin/mergedataWithAcroform"})
public class MyFirstAEMFormsServlet extends SlingAllMethodsServlet
{
private static final long serialVersionUID = 1L;
@Reference
FormsService formsService;
protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response)
{
String file_path = request.getParameter("save_location");
java.io.InputStream pdf_document_is = null;
java.io.InputStream xml_is = null;
javax.servlet.http.Part pdf_document_part = null;
javax.servlet.http.Part xml_data_part = null;
try
{
pdf_document_part = request.getPart("pdf_file");
xml_data_part = request.getPart("xml_data_file");
pdf_document_is = pdf_document_part.getInputStream();
xml_is = xml_data_part.getInputStream();
Document data_merged_document = formsService.importData(new Document(pdf_document_is), new Document(xml_is));
data_merged_document.copyToFile(new File(file_path));
}
catch(Exception e)
{
response.sendError(400,e.getMessage());
}
}
}
Build and Deploy
To build your project, please follow the following steps:
- Open command prompt window
- Navigate to
c:\aemformsbundles\mysite\core - Execute the command
mvn clean install -PautoInstallBundle - The above command automatically builds and deploys the bundle to your AEM instance running on localhost:4502
The bundle is also available in the following location C:\AEMFormsBundles\mysite\core\target. The bundle can also be deployed into AEM using the
Test the Servlet Resolver
Point your browser to the . This tells you the servlet that is invoked for a given path as seen in the screen shot below
Test the servlet using Postman
