Yogesh's Tech Blog

What is XML Oriented programming ? – In this approach every application have one or set of documents associated with it. This xml documents contain application configuration information which are defines application’s run time behavior. It is very easy to maintain frequently changing configurations setting using xml document. What is Annotation Oriented Programming ? – Annotation oriented programming language leverage active code generation with the use of declaration tags embedded within the application source code to generate any other kind of source code, configuration files etc. XML vs Annotation 1. XML duplicates a lot of information like class, method name etc. But annotation are part of class it self so no duplication of information. For example web.xml <servlet> <servlet-name> DemoServlet </servlet-name> <servlet-class> demo.servlet.DemoServlet </servlet-class> </servlet> <servlet-map...

This post is with reference of Restful WS using Jersey Part 2 – Parameterized approach to provide a java client for accessing Restful services The Complete code for Java Client /* * To change this template, choose Tools | Templates * and open the template in the editor. */ package demo.client; import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.URL; import java.net.URLConnection; /** * * @author Yogesh */ public class JavaClient {     public static void main(String[] args) {         String restUrlStr = " http://localhost:17286/HelloWorldRestWSPrj/resources/hello/Yogesh?query=age";         URLConnection conn = null;         try {             URL restUrl = new URL(restUrlStr);   ...

This post is in sequel  RESTful WS using Jersey Part 1 - Hello World . It shows how to utilize parameterized urls as well as query string. Please refer Part 1 to know developing restful services from scratch. This post utilizes same example. Parameters can be passed as part of path as well as url query string. Jersey provides two annotations @PathParam   and @QueryParam for extracting parameters from path and query respectively. We have modified getText method to accept both kind of parameters as below 1. Complete resource class will be package demo.resorces; import javax.ws.rs.core.Context; import javax.ws.rs.core.UriInfo; import javax.ws.rs.PathParam; import javax.ws.rs.Consumes; import javax.ws.rs.PUT; import javax.ws.rs.Path; import javax.ws.rs.GET; import javax.ws.rs.Produces; import javax.ws.rs.QueryParam; /** * REST Web Service * * @author Yogesh */ @Path("hello/{UserName}") p...

Here is the simple tutorial for RESTful Web Service using jersey implementation for RESTful Web Services. Java EE 6 has introduced jersey API as implementation for JSR-311 as API for RESTful Web Services. For ease of development,deployment and testing i have used NetBean 6.8 which supports JEE 6. Jersey is an annotation based implementation. Here are the few important annotations used in this tutorial @path(“/path/”) - a relative URI path indicating where the Java class will be hosted @GET - a request method designator and corresponds to HTTP Get method @POST - a request method designator and corresponds to HTTP Post method @Produces("text/plain") - specify the MIME media types of representations a resource can produce @Consumes("text/plain") -specify the MIME media types of representations a resource can consume @PathParam("User_Name") - a type of parameter that you can extract for use in your resource class @QueryPar...

   This tutorial gives introduction to coding and deploying Servlet as per 3.0 specification. Servlet 3.0 specification introduced Annotations that makes deploying servlet, Lister and Filter easier ever before. Here is the Servlet with Annotation ready to deploy without any web.xml. Here @webservlet annotation is being used to define servlet name, url pattern and init parameters. This annatation is equivalent to following entry in web.xml < servlet > <servlet-name> HelloServlet </servlet-name> <servlet-class> demo.HelloServlet </servlet-class> <init-param> <param-name> name </param-name> <param-value> Yogesh </param-value> </init-param> </servlet> < servlet-mapping > <servlet-name> HelloServlet </servlet-name> <url-pattern> /HelloServlet </url-pattern> </servlet-mapping> Complete Code : /* * To change this tem...