This tutorial show you how to use Jersey client APIs to create a RESTful Java client to perform “GET” and “POST” requests to REST service that created in this “Jersey + Json” example.
1. Jersey Client Dependency
To use Jersey client APIs, declares “jersey-client.jar” in your pom.xml file.
File : pom.xml
<dependency> <groupId>com.sun.jersey</groupId> <artifactId>jersey-client</artifactId> <version>1.8</version> </dependency>
2. GET Request
Review last REST service.
@Path("/json/metallica")
public class JSONService {
@GET
@Path("/get")
@Produces(MediaType.APPLICATION_JSON)
public Track getTrackInJSON() {
Track track = new Track();
track.setTitle("Enter Sandman");
track.setSinger("Metallica");
return track;
}
//...
Jersey client to send a “GET” request and print out the returned json data.
package com.favtuts.client;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
public class JerseyClientGet {
public static void main(String[] args) {
try {
Client client = Client.create();
WebResource webResource = client
.resource("http://localhost:8080/RESTfulExample/rest/json/metallica/get");
ClientResponse response = webResource.accept("application/json")
.get(ClientResponse.class);
if (response.getStatus() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatus());
}
String output = response.getEntity(String.class);
System.out.println("Output from Server .... \n");
System.out.println(output);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Output…
Output from Server ....
{"singer":"Metallica","title":"Enter Sandman"}3. POST Request
Review last REST service.
@Path("/json/metallica")
public class JSONService {
@POST
@Path("/post")
@Consumes(MediaType.APPLICATION_JSON)
public Response createTrackInJSON(Track track) {
String result = "Track saved : " + track;
return Response.status(201).entity(result).build();
}
//...
Jersey client to send a “POST” request, with json data and print out the returned output.
package com.favtuts.client;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
public class JerseyClientPost {
public static void main(String[] args) {
try {
Client client = Client.create();
WebResource webResource = client
.resource("http://localhost:8080/RESTfulExample/rest/json/metallica/post");
String input = "{\"singer\":\"Metallica\",\"title\":\"Fade To Black\"}";
ClientResponse response = webResource.type("application/json")
.post(ClientResponse.class, input);
if (response.getStatus() != 201) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatus());
}
System.out.println("Output from Server .... \n");
String output = response.getEntity(String.class);
System.out.println(output);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Output…
Output from Server ....
Track saved : Track [title=Fade To Black, singer=Metallica]Download Source Code
$ git clone https://github.com/favtuts/java-jax-rs-tutorials.git
$ cd jax-rs-jersey-client-example