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Creating RESTful Web Services Tutorial

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This article explain the step by step how to create RESTful Web Services.

More Info
									Creating RESTful Web Services Tutorial
To follow this tutorial, you need the following software and resources.

1. NetBeans IDE 6.x, I had the latest 6.5 M1 version downloaded.
2. JDK version 5 or 6
3. GlassFish V2 Application Server
4. Last but not the least, knowledge about REST. Here are some links to get you started:

       RESTful Web Services
       Implementing RESTful Web Services in Java
       JSR 311: JAX-RS: The JavaTM API for RESTful Web Services

Creating a Ne w Project:
1. Choose File -> New Project. Select Web within the Categories and select Web Application under
Projects and click Next.
2. In the next screen, enter the project name as “HelloWorldRestWS”. Leave the rest as default as shown
below:




                                                                                                      .
3. In the screen shown below, select GlassFish V2 as the server, Java EE 5 as the Java Version, and
HelloWorld as the context path and click Finish.




Creating a Web Resource:
Now, that we have our web application, lets create a simple Java Class for our web resource. To do this:
1. Right click on the project node, and select New - RESTful Web Services from Patterns… This will
bring up a wizard as shown below, select the Singleton Pattern and click Next.
2. Next, specify all the details required for the Resource class and click Finish. Don’t forget to change
the MIME Type from application/xml to text/plain.




3. At this point, take a look at the source code generated by the IDE, which looks like:

/*
 * HelloWorldResource
 *
 * Created on July 23, 2008, 10:13 AM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package com.stelligent.ws;

import   javax.ws.rs.core.Context;
import   javax.ws.rs.core.UriInfo;
import   javax.ws.rs.Path;
import   javax.ws.rs.GET;
import   javax.ws.rs.PUT;
import   javax.ws.rs.ProduceMime;
import   javax.ws.rs.ConsumeMime;

/**
 * REST Web Service
    *
    * @author meerasubbarao
    */

@Path("helloWorld")
public class HelloWorldResource {
    @Context
    private UriInfo context;

       /** Creates a new instance of HelloWorldResource */
       public HelloWorldResource() {
       }

    /**
      * Retrieves representation of an instance of
com.stelligent.ws.HelloWorldResource
      * @return an instance of java.lang.String
      */
    @GET
    @ProduceMime("text/plain")
    public String getText() {
         //TODO return proper representation object
         throw new UnsupportedOperationException();
    }

       /**
         * PUT method for updating or creating an instance of HelloWorldResource
         * @param content representation for the resource
         * @return an HTTP response with content of the updated or created resource.
         */
       @PUT
       @ConsumeMime("text/plain")
       public void putText(String content) {
       }
}

Testing the RESTful Web Services:
1. Let’s try this application and see first hand if it works. Right click on the project node and select
“Test RESTful Web Services“. The GlassFish V2 application server starts, our web application is
deployed, and at this point you should see a link for the web service as shown below, choose the GET
method to test.
2. Oops, something went wrong, Internal Server Error?




3. No problem, we can fix this. Let’s fix our getText method which is the culprit for our error.
It was:

    /**
      * Retrieves representation of an instance of
com.stelligent.ws.HelloWorldResource
      * @return an instance of java.lang.String
      */
    @GET
    @ProduceMime("text/plain")
    public String getText() {
         //TODO return proper representation object
         throw new UnsupportedOperationException();
    }




Let’s change it to:

    /**
      * Retrieves representation of an instance of
com.stelligent.ws.HelloWorldResource
      * @return an instance of java.lang.String
      */
    @GET
    @ProduceMime("text/plain")
    public String sayHello(){
         //TODO return proper representation object
         return "Hello World from REST web services generated in 60 seconds";
    }
4. At this point, run the application again and you should get a valid response back.




That’s it. We were able to successfully create, deploy and test RESTful web services. Give it a try, it is
just a matter of 60 seconds.

								
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