REST stands for REpresentational State Transfer, was first introduced by Roy Fielding in his thesis "Architectural Styles and the Design of Network-based Software Architectures" in year 2000.
REST is an architectural style. HTTP is a protocol which contains the set of REST architectural constraints.
REST fundamentals
RESTful Web Services
RESTful Web Services have embraced by large service providers across the web as an alternative to SOAP based Web Services due to its simplicity. This post will demonstrate how to create a RESTful Web Service and client using Jersey framework which extends JAX-RS API. Examples are done using Eclipse IDE and Java SE 6.
Creating RESTful Web ServiceTo run the project, right click on it and click on run as ->run on server.
Execute the following URL in your browser and you'll see the output.
output
Creating Client
Once you run the client program, you'll get following output.
REST is an architectural style. HTTP is a protocol which contains the set of REST architectural constraints.
REST fundamentals
- Everything in REST is considered as a resource.
- Every resource is identified by an URI.
- Uses uniform interfaces. Resources are handled using POST, GET, PUT, DELETE operations which are similar to Create, Read, update and Delete(CRUD) operations.
- Be stateless. Every request is an independent request. Each request from client to server must contain all the information necessary to understand the request.
- Communications are done via representations. E.g. XML, JSON
RESTful Web Services
RESTful Web Services have embraced by large service providers across the web as an alternative to SOAP based Web Services due to its simplicity. This post will demonstrate how to create a RESTful Web Service and client using Jersey framework which extends JAX-RS API. Examples are done using Eclipse IDE and Java SE 6.
Creating RESTful Web Service
- In Eclipse, create a new dynamic web project called "RESTfulWS"
- Download Jersey zip bundle from here. Jersey version used in these examples is 1.17.1. Once you unzip it you'll have a directory called "jersey-archive-1.17.1". Inside it find the lib directory. Copy following jars from there and paste them inside WEB-INF -> lib folder in your project. Once you've done that, add those jars to your project build path as well.
- asm-3.1.jar
- jersey-client-1.17.1.jar
- jersey-core-1.17.1.jar
- jersey-server-1.17.1.jar
- jersey-servlet-1.17.1.jar
- jsr311-api-1.1.1.jar
- In your project, inside Java Resources -> src create a new package called "com.eviac.blog.restws". Inside it create a new java class called "UserInfo". Also include the given web.xml file inside WEB-INF folder. UserInfo.java
package com.eviac.blog.restws; import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.PathParam; import javax.ws.rs.Produces; import javax.ws.rs.core.MediaType; /** * * @author pavithra * */ // @Path here defines class level path. Identifies the URI path that // a resource class will serve requests for. @Path("UserInfoService") public class UserInfo { // @GET here defines, this method will method will process HTTP GET // requests. @GET // @Path here defines method level path. Identifies the URI path that a // resource class method will serve requests for. @Path("/name/{i}") // @Produces here defines the media type(s) that the methods // of a resource class can produce. @Produces(MediaType.TEXT_XML) // @PathParam injects the value of URI parameter that defined in @Path // expression, into the method. public String userName(@PathParam("i") String i) { String name = i; return "<User>" + "<Name>" + name + "</Name>" + "</User>"; } @GET @Path("/age/{j}") @Produces(MediaType.TEXT_XML) public String userAge(@PathParam("j") int j) { int age = j; return "<User>" + "<Age>" + age + "</Age>" + "</User>"; } }web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>RESTfulWS</display-name> <servlet> <servlet-name>Jersey REST Service</servlet-name> <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class> <init-param> <param-name>com.sun.jersey.config.property.packages</param-name> <param-value>com.eviac.blog.restws</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Jersey REST Service</servlet-name> <url-pattern>/rest/*</url-pattern> </servlet-mapping> </web-app>
http://localhost:8080/RESTfulWS/rest/UserInfoService/name/Pavithra
- Create a package called "com.eviac.blog.restclient". Inside it create a java class called "UserInfoClient". UserInfoClient.java
package com.eviac.blog.restclient; import javax.ws.rs.core.MediaType; 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.config.ClientConfig; import com.sun.jersey.api.client.config.DefaultClientConfig; /** * * @author pavithra * */ public class UserInfoClient { public static final String BASE_URI = "http://localhost:8080/RESTfulWS"; public static final String PATH_NAME = "/UserInfoService/name/"; public static final String PATH_AGE = "/UserInfoService/age/"; public static void main(String[] args) { String name = "Pavithra"; int age = 25; ClientConfig config = new DefaultClientConfig(); Client client = Client.create(config); WebResource resource = client.resource(BASE_URI); WebResource nameResource = resource.path("rest").path(PATH_NAME + name); System.out.println("Client Response \n" + getClientResponse(nameResource)); System.out.println("Response \n" + getResponse(nameResource) + "\n\n"); WebResource ageResource = resource.path("rest").path(PATH_AGE + age); System.out.println("Client Response \n" + getClientResponse(ageResource)); System.out.println("Response \n" + getResponse(ageResource)); } /** * Returns client response. * e.g : * GET http://localhost:8080/RESTfulWS/rest/UserInfoService/name/Pavithra * returned a response status of 200 OK * * @param service * @return */ private static String getClientResponse(WebResource resource) { return resource.accept(MediaType.TEXT_XML).get(ClientResponse.class) .toString(); } /** * Returns the response as XML * e.g : <User><Name>Pavithra</Name></User> * * @param service * @return */ private static String getResponse(WebResource resource) { return resource.accept(MediaType.TEXT_XML).get(String.class); } }
Client Response GET http://localhost:8080/RESTfulWS/rest/UserInfoService/name/Pavithra returned a response status of 200 OK Response <User><Name>Pavithra</Name></User> Client Response GET http://localhost:8080/RESTfulWS/rest/UserInfoService/age/25 returned a response status of 200 OK Response <User><Age>25</Age></User>Enjoy!
Very good introduction, thank you
ReplyDeleteThe development of artificial intelligence (AI) has propelled more programming architects, information scientists, and different experts to investigate the plausibility of a vocation in machine learning. Notwithstanding, a few newcomers will in general spotlight a lot on hypothesis and insufficient on commonsense application. machine learning projects for final year In case you will succeed, you have to begin building machine learning projects in the near future.
DeleteProjects assist you with improving your applied ML skills rapidly while allowing you to investigate an intriguing point. Furthermore, you can include projects into your portfolio, making it simpler to get a vocation, discover cool profession openings, and Final Year Project Centers in Chennai even arrange a more significant compensation.
Data analytics is the study of dissecting crude data so as to make decisions about that data. Data analytics advances and procedures are generally utilized in business ventures to empower associations to settle on progressively Python Training in Chennai educated business choices. In the present worldwide commercial center, it isn't sufficient to assemble data and do the math; you should realize how to apply that data to genuine situations such that will affect conduct. In the program you will initially gain proficiency with the specialized skills, including R and Python dialects most usually utilized in data analytics programming and usage; Python Training in Chennai at that point center around the commonsense application, in view of genuine business issues in a scope of industry segments, for example, wellbeing, promoting and account.
The Nodejs Projects Angular Training covers a wide range of topics including Components, Angular Directives, Angular Services, Pipes, security fundamentals, Routing, and Angular programmability. The new Angular TRaining will lay the foundation you need to specialise in Single Page Application developer. Angular Training
Admiring the time and effort you put into your blog and detailed information you offer!.. freelance web designer peter
ReplyDelete