Simple REST Client using Jersey

SimpleRestClient.java

/**
 * The MIT License (MIT)
 * Copyright (c) 2016 Ricardo Giaviti
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package br.com.restclient;

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.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriBuilder;

/**
 * Simple example to demonstrate how to use Jersey to build a Simple REST client.
 * Jersey is a lot more powerful. Take a look at the full documentation.
 * https://jersey.java.net/
 *
 * @author Ricardo Giaviti - https://github.com/rgiaviti
 * 
 * Maven Dependency needed:
 * 		<dependency>
 *			<groupId>org.glassfish.jersey.core</groupId>
 *			<artifactId>jersey-client</artifactId>
 *			<version>2.23.2</version>
 *		</dependency>
 */
public class SimpleRestClient {

    /**
     * Target (URL) of API we are calling
     * Example: http://example.com/api
     */
    private transient String target;

    /**
     * Constructor with target (URL format).
     *
     * @param target URL of API. Example: http://example.com/api
     */
    public SimpleRestClient(final String target) {
        this.target = target;
    }

    /**
     * Do a POST request and return the Response. The object Response contains all the data you
     * might need to check the information returned (codes, body...).
     *
     * @param path /v1/resource/item
     * @param content the content you want to put in the request body.
     * @param headers the HTTP headers
     * @return
     */
    public Response doPost(final String path, final Entity<?> content, final MultivaluedMap<String, Object> headers) {
        return this.buildRequest(path, headers).buildPost(content).invoke();
    }

    /**
     * Do a GET request and return the Response. The object Response contains all the data you
     * might need to check the information returned (codes, body...).
     *
     * @param path /v1/resource/item
     * @param headers the HTTP headers
     * @return
     */
    public Response doGet(final String path, final MultivaluedMap<String, Object> headers) {
        return this.buildRequest(path, headers).buildGet().invoke();
    }

    /**
     * Do a PUT request and return the Response. The object Response contains all the data you
     * might need to check the information returned (codes, body...).
     *
     * @param path the REST path. Example: /v1/resource/item
     * @param content the content you want to put in the request body.
     * @param headers the HTTP headers
     * @return
     */
    public Response doPut(final String path, final Entity<?> content, final MultivaluedMap<String, Object> headers) {
        return this.buildRequest(path, headers).buildPut(content).invoke();
    }

    /**
     * Do a DELETE request and return the Response. The object Response contains all the data you
     * might need to check the information returned (codes, body...).
     *
     * @param path the REST path. Example: /v1/resource/item
     * @param headers The HTTP Headers
     * @return the response object
     */
    public Response doDelete(final String path, final MultivaluedMap<String, Object> headers) {
        return this.buildRequest(path, headers).buildDelete().invoke();
    }

    /**
     * Build the Request for all other methods. Acts like a helper
     *
     * @param path
     * @param headers
     * @return
     */
    private Invocation.Builder buildRequest(final String path, final MultivaluedMap<String, Object> headers) {
        final Client client = ClientBuilder.newClient();
        final UriBuilder uriBuilder = UriBuilder.fromUri(this.target);
        return client.target(uriBuilder).path(path).request().headers(headers);
    }

    /**
     * Return the target
     *
     * @return the target URL
     */
    public String getTarget() {
        return target;
    }
}