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Host a Custom Skill as a Web Service

You can build a custom skill for Alexa by extending a servlet that accepts requests from and sends responses to the Alexa service in the cloud.

The servlet must meet certain requirements to handle requests sent by Alexa and adhere to the Alexa Skills Kit interface standards. For more information, see Host a Custom Skill as a Web Service in the Alexa Skills Kit technical documentation.

ASK SDK Servlet Support

The Alexa Skills Kit SDK (ASK SDK) for Java provides boilerplate code for request verification and timestamp verification through the ask-sdk-servlet-support package. This package provides the verification components and SkillServlet for skill invocation.

Installation

You can import the latest version of ask-sdk-servlet-support by adding it as a maven dependency in your project's pom.xml.

Skill Servlet

The SkillServlet class registers the skill instance from the SkillBuilder object, and provides a doPost method which is responsible for deserialization of the incoming request, verification of the input request before invoking the skill, and serialization of the generated response.

Usage

public class HelloWorldSkillServlet extends SkillServlet {

    @Override
    public HelloWorldSkillServlet() {
        super(getSkill());
    }

    @Override
    private static Skill getSkill() {
        return Skills.standard()
                .addRequestHandlers(
                        new CancelandStopIntentHandler(),
                        new HelloWorldIntentHandler(),
                        new HelpIntentHandler(),
                        new LaunchRequestHandler(),
                        new SessionEndedRequestHandler())
                // Add your skill id below
                //.withSkillId("")
                .build();
    }
}

Sample skill with servlet support can be found here.