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
$ git clone https://github.com/favtuts/java-jax-rs-tutorials.git
$ cd jax-rs-resteasy-client-example