RESTful Java Client With RESTEasy Client Framework

This tutorial show you how to create a RESTful Java client with RESTEasy client framework, to perform “GET” and “POST” requests to REST service that created in last “Jackson + JAX-RS” tutorial.

1. RESTEasy Client Framework

RESTEasy client framework is included in RESTEasy core module, so, you just need to declares the “resteasy-jaxrs.jar” in your pom.xml file.

File : pom.xml

<dependency><groupId>org.jboss.resteasy</groupId><artifactId>resteasy-jaxrs</artifactId><version>2.2.1.GA</version></dependency>

2. GET Request

Review last REST service.

@Path("/json/product")public class JSONService { @GET@Path("/get")@Produces("application/json")public Product getProductInJSON() { Product product = new Product();product.setName("iPad 3");product.setQty(999); return product;  }//...

RESTEasy client to send a “GET” request.

import java.io.BufferedReader;import java.io.ByteArrayInputStream;import java.io.IOException;import java.io.InputStreamReader;import org.apache.http.client.ClientProtocolException;import org.jboss.resteasy.client.ClientRequest;import org.jboss.resteasy.client.ClientResponse; public class RESTEasyClientGet { public static void main(String[] args) {  try { ClientRequest request = new ClientRequest("http://localhost:8080/RESTfulExample/json/product/get");request.accept("application/json");ClientResponse<String> response = request.get(String.class); if (response.getStatus() != 200) {throw new RuntimeException("Failed : HTTP error code : "+ response.getStatus());} BufferedReader br = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(response.getEntity().getBytes()))); String output;System.out.println("Output from Server .... \n");while ((output = br.readLine()) != null) {System.out.println(output);}   } catch (ClientProtocolException e) { e.printStackTrace();   } catch (IOException e) { e.printStackTrace();   } catch (Exception e) { e.printStackTrace();   } } }

Output…

Output from Server ....  {"qty":999,"name":"iPad 3"}

3. POST Request

Review last REST service also.

@Path("/json/product")public class JSONService {         @POST@Path("/post")@Consumes("application/json")public Response createProductInJSON(Product product) { String result = "Product created : " + product;return Response.status(201).entity(result).build(); }//...

RESTEasy client to send a “POST” request.

import java.io.BufferedReader;import java.io.ByteArrayInputStream;import java.io.IOException;import java.io.InputStreamReader;import java.net.MalformedURLException;import org.jboss.resteasy.client.ClientRequest;import org.jboss.resteasy.client.ClientResponse; public class RESTEasyClientPost { public static void main(String[] args) {   try { ClientRequest request = new ClientRequest("http://localhost:8080/RESTfulExample/json/product/post");request.accept("application/json"); String input = "{\"qty\":100,\"name\":\"iPad 4\"}";request.body("application/json", input); ClientResponse<String> response = request.post(String.class); if (response.getStatus() != 201) {throw new RuntimeException("Failed : HTTP error code : "+ response.getStatus());} BufferedReader br = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(response.getEntity().getBytes()))); String output;System.out.println("Output from Server .... \n");while ((output = br.readLine()) != null) {System.out.println(output);}   } catch (MalformedURLException e) { e.printStackTrace();   } catch (IOException e) { e.printStackTrace();   } catch (Exception e) { e.printStackTrace();   } } }

Output…

Output from Server ....  Product created : Product [name=iPad 4, qty=100]

Download Source Code

Download it – RESTful-Java-Client-RESTEasyt-Example.zip (9 KB)

References

1. Jackson Official Website
2. RESTful Java client with java.net.URL
3. RESTful Java client with Apache HttpClient