Rest Client HTTP (WebTarget)

Samples ▸ Rest Client HTTP (WebTarget)

GET Method
POST Method (url parameters)
POST Method (form parameters)

Notes:
▸ See this page for an example of a REST application: REST web services (jersey, spring)

GET Method

Java example:

import java.io.IOException;

import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Invocation;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import org.glassfish.jersey.filter.LoggingFilter;

public class Test {
    public static void main(String[] args) throws IOException {
        final String urlString = "http://localhost:8080/mtitek-rest-sample-1.0.0-SNAPSHOT/rest/myEntity/getMyEntity1";

        final Client client = ClientBuilder.newClient();

        client.register(new LoggingFilter());

        WebTarget webTarget = client.target(urlString);

        webTarget = webTarget.queryParam("qpvalue1", "val11").queryParam("qpvalue2", "val21").queryParam("qpvalue3", "val31");

        final Invocation.Builder invocationBuilder = webTarget.request(MediaType.APPLICATION_XML);

        final Response response = invocationBuilder.get();

        // response body
        System.out.println(response.readEntity(String.class));
    }
}

Maven POM dependencies:

<dependency>
    <groupId>javax.ws.rs</groupId>
    <artifactId>javax.ws.rs-api</artifactId>
    <version>2.0.1</version>
</dependency>

<dependency>
    <groupId>org.glassfish.jersey.core</groupId>
    <artifactId>jersey-common</artifactId>
    <version>2.19</version>
</dependency>

<dependency>
    <groupId>org.glassfish.jersey.core</groupId>
    <artifactId>jersey-client</artifactId>
    <version>2.19</version>
</dependency>

Http method 'getMyEntity1':

@GET
@Path("/getMyEntity1")
public Response getMyEntity1(
        @QueryParam(value = "qpvalue1") final String value1,

        @QueryParam(value = "qpvalue2") final String value2,

        @QueryParam(value = "qpvalue3") final String value3) {
    MyEntity myEntity = new MyEntity();

    //...

    return Response.ok(myEntity).build();
}

Request Headers:

GET /mtitek-rest-sample-1.0.0-SNAPSHOT/rest/myEntity/getMyEntity1?qpvalue1=val11&qpvalue2=val21&qpvalue3=val31 HTTP/1.1
Accept: application/xml
User-Agent: Jersey/2.19 (HttpUrlConnection 1.8.0_101)
Host: localhost:7000
Connection: keep-alive

POST Method (url parameters)

Java example:

import java.io.IOException;

import javax.ws.rs.HttpMethod;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Invocation;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import org.glassfish.jersey.filter.LoggingFilter;

public class Test {
    public static void main(String[] args) throws IOException {
        final String urlString = "http://localhost:8080/mtitek-rest-sample-1.0.0-SNAPSHOT/rest/myEntity/postMyEntity1";

        final Client client = ClientBuilder.newClient();

        client.register(new LoggingFilter());

        WebTarget webTarget = client.target(urlString);

        webTarget = webTarget.queryParam("qpvalue1", "val11").queryParam("qpvalue2", "val21").queryParam("qpvalue3", "val31");

        final Invocation.Builder invocationBuilder = webTarget.request(MediaType.APPLICATION_XML);

        final Response response = invocationBuilder.method(HttpMethod.POST, null, Response.class);

        // response body
        System.out.println(response.readEntity(String.class));
    }
}

Http method 'postMyEntity1':

@POST
@Path("/postMyEntity1")
public Response postMyEntity1(
        @QueryParam(value = "qpvalue1") final String value1,

        @QueryParam(value = "qpvalue2") final String value2,

        @QueryParam(value = "qpvalue3") final String value3) {
    MyEntity myEntity = new MyEntity();

    //...

    return Response.ok(myEntity).build();
}

Request Headers:

POST /mtitek-rest-sample-1.0.0-SNAPSHOT/rest/myEntity/postMyEntity1?qpvalue1=val11&qpvalue2=val21&qpvalue3=val31 HTTP/1.1
Accept: application/xml
User-Agent: Jersey/2.19 (HttpUrlConnection 1.8.0_101)
Host: localhost:7000
Connection: keep-alive

POST Method (form parameters)

Java example:

import java.io.IOException;

import javax.ws.rs.HttpMethod;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.Invocation;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import org.glassfish.jersey.filter.LoggingFilter;

public class Test {
    public static void main(String[] args) throws IOException {
        final String urlString = "http://localhost:8080/mtitek-rest-sample-1.0.0-SNAPSHOT/rest/myEntity/getMyEntity1";

        final Client client = ClientBuilder.newClient();

        client.register(new LoggingFilter());

        WebTarget webTarget = client.target(urlString);

        webTarget = webTarget.queryParam("qpvalue1", "val11").queryParam("qpvalue2", "val21").queryParam("qpvalue3", "val31");

        final Invocation.Builder invocationBuilder = webTarget.request(MediaType.APPLICATION_XML);

        final Response response = invocationBuilder.method(HttpMethod.POST, Entity.entity(null, MediaType.APPLICATION_FORM_URLENCODED), Response.class);

        // response body
        System.out.println(response.readEntity(String.class));
    }
}

Http method 'postMyEntity2':

@POST
@Path("/postMyEntity2")
@Consumes({ MediaType.APPLICATION_FORM_URLENCODED })
public Response postMyEntity2(
        @FormParam(value = "qpvalue1") final String value1,

        @FormParam(value = "qpvalue2") final String value2,

        @FormParam(value = "qpvalue3") final String value3) {
    MyEntity myEntity = new MyEntity();

    //...

    return Response.ok(myEntity).build();
}

Request Headers:

POST /mtitek-rest-sample-1.0.0-SNAPSHOT/rest/myEntity/getMyEntity1?qpvalue1=val11&qpvalue2=val21&qpvalue3=val31 HTTP/1.1
Accept: application/xml
Content-Type: application/x-www-form-urlencoded
User-Agent: Jersey/2.19 (HttpUrlConnection 1.8.0_101)
Host: localhost:7000
Connection: keep-alive