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Downloading a file from web application

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      This post explains developing a web application which allows requestor to download a file. Here web app will have a servlet which streams requested file to requestor. follow the step to develop it using NetBean 6.8 1. Create a web application [ refer previous posts ] 2.Create a Servlet and add the code given below in doGet method      String filePath =null;      int length =0;        //accept file name as parameter         String fileName = request.getParameter("FILE_NAME");         InputStream is = getServletContext().getClassLoader().getResourceAsStream("/"+fileName);         if(is == null){             PrintWriter writer = response.getWriter();             writer.append("<html><body><h1> File "+ fileName +"has not Found</h1></body></html>");             writer.close();         }        //set header information         response.setCont
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RESTful WS using Jersey Part 3 – Java Client

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);             conn = restUrl.openConnection();             conn.setDoInput(true);             conn.setDoOutput(true);             conn.setAllowUserInteraction(true);          
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RESTful WS using Jersey Part 2 – Parameterized approach

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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}") public cla
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RESTful WS using Jersey Part 1 - Hello World

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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
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