RESTful WebService Tutorial

Representational State Transfer (REST) is a style of software architecture for distributed systems such as the World Wide Web. REST has emerged as a predominant Web service design model.

We will be building a REST application using Apache tomcat , Jersey , Eclipse .

Below is the code for making a dummy application for Restful WebService using Jersey.

To begin with first set up all the jars required for the application.  Click the below link to download all the jars.

https://sites.google.com/site/balonideepak/lib.zip?attredirects=0&d=1

After that  create a client for making a hit to the app.

Create a class like JerseyGetClient.java and paste the below code inside it :

import com.sun.jersey.api.client.Client;

import com.sun.jersey.api.client.ClientResponse;

import com.sun.jersey.api.client.WebResource;

import com.sun.jersey.api.client.WebResource.Builder;

public class JerseyGetClient {

public static void main(String arg[]){

Client client =Client.create();

String url ="http://localhost:8085/REST-WSproject/rest/json/metallica/get";

WebResource resource = client.resource(url);

Builder builder = resource.accept("application/json");

ClientResponse response = builder.get(ClientResponse.class);

    

if (response.getStatus() != 200) {

throw new RuntimeException("Failed : HTTP error code : "

+ response.getStatus());

}

    String output = response.getEntity(String.class);

    System.out.println("Output from Server .... \n");

System.out.println(output);

}

}

After this create a class to process the data. I have named it as JSONService . Check for the annotation inside this class.

import javax.ws.rs.Consumes;

import javax.ws.rs.GET;

import javax.ws.rs.POST;

import javax.ws.rs.Path;

import javax.ws.rs.Produces;

import javax.ws.rs.core.MediaType;

import javax.ws.rs.core.Response;

@Path("/json/metallica")

public class JSONService {

@GET

@Path("/get")

@Produces(MediaType.APPLICATION_JSON)

public Track getTrackInJSON(){

Track track=new Track();

track.setSinger("Akon");

track.setTitle("UnForgettable");

return track;

}

}

Create a POJO class . I have named it as Track.

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement

public class Track {

private String singer;

private String title;

public String getSinger() {

return singer;

}

public void setSinger(String singer) {

this.singer = singer;

}

public String getTitle() {

return title;

}

public void setTitle(String title) {

this.title = title;

}

@Override

public String toString() {

return "Track [title=" + title + ", singer=" + singer + "]";

}

}

Now it's time to modify the web.xml  to configure the Jersey settings. Download the web.xml  contents from  the below link and paste inside your web.xml

https://sites.google.com/site/balonideepak/web.xml?attredirects=0&d=1

That's all .....cheers!!!!!

Click the link below to download the code and jars required for the project.

https://sites.google.com/site/balonideepak/src.zip?attredirects=0&d=1

https://sites.google.com/site/balonideepak/lib.zip?attredirects=0&d=1

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