Юзаем API VK. Использовалась технология JavaFX

Класс контроллера

package sample;

import com.apivk.APIvk;
import javafx.event.ActionEvent;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;

import java.io.IOException;

public class Controller {
    public WebView view1;
    private String client_id = "********";
    private String scope = "messages";
    private String redirect_uri = "http://oauth.vk.com/blank.html";
    private String display = "popup";
    private String response_type = "token";
    private String email = "********";
    private String pass = "********";
    public static String  access_token;
    private String client_secret = "*********";
    WebEngine webEngine;


    public void SetConnect(ActionEvent actionEvent) throws IOException {
       HttpClient httpClient = new DefaultHttpClient();
        HttpPost post = new HttpPost("http://oauth.vk.com/authorize?" +
                "client_id="+client_id+
                "&scope="+scope+
                "&redirect_uri="+redirect_uri+
                "&display="+display+
                "&response_type="+response_type +
                "&v=5.52");

        HttpResponse response;
        response = httpClient.execute(post);
        post.abort();
        StatusLine status = response.getStatusLine();
        System.out.println(status);

        webEngine = view1.getEngine();
        webEngine.load(post.getURI().toString());
    }

    public void GetToken(ActionEvent actionEvent) throws IOException {
        String HeaderLocation = webEngine.getLocation();
        access_token = HeaderLocation.split("#")[1].split("&")[0].split("=")[1].toString();
//        new Msg("Connection OK, access_token = " + access_token);
        APIvk.GetMessage();
    }
}

package sample;

import com.apivk.APIvk;

import javafx.event.ActionEvent;

import javafx.scene.web.WebEngine;

import javafx.scene.web.WebView;

import org.apache.http.HttpResponse;

import org.apache.http.StatusLine;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.DefaultHttpClient;

import java.io.IOException;

public class Controller {

public WebView view1;

private String client_id = "********";

private String scope = "messages";

private String redirect_uri = "http://oauth.vk.com/blank.html";

private String display = "popup";

private String response_type = "token";

private String email = "********";

private String pass = "********";

public static String access_token;

private String client_secret = "*********";

WebEngine webEngine;

public void SetConnect(ActionEvent actionEvent) throws IOException {

HttpClient httpClient = new DefaultHttpClient();

HttpPost post = new HttpPost("http://oauth.vk.com/authorize?" +

"client_id="+client_id+

"&scope="+scope+

"&redirect_uri="+redirect_uri+

"&display="+display+

"&response_type="+response_type +

"&v=5.52");

HttpResponse response;

response = httpClient.execute(post);

post.abort();

StatusLine status = response.getStatusLine();

System.out.println(status);

webEngine = view1.getEngine();

webEngine.load(post.getURI().toString());

}

public void GetToken(ActionEvent actionEvent) throws IOException {

String HeaderLocation = webEngine.getLocation();

access_token = HeaderLocation.split("#")[1].split("&")[0].split("=")[1].toString();

// new Msg("Connection OK, access_token = " + access_token);

APIvk.GetMessage();

}

Класс APIvk

package com.apivk;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import sample.Controller;
import sample.com.messages.Msg;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;

public class APIvk {
    public static void GetMessage () throws IOException {
        HttpClient httpClient = new DefaultHttpClient();
        HttpPost post = new HttpPost(
                "https://api.vk.com/method/" +
                "messages.get" +
                "?out=0" +
                "&access_token=" + Controller.access_token);
        HttpResponse response = httpClient.execute(post);
        post.abort();

        String line = "";
        URL url = new URL(post.getURI().toString());
        BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));
        line = reader.readLine();
        reader.close();
        new Msg(line);
    }
}

package com.apivk;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.DefaultHttpClient;

import sample.Controller;

import sample.com.messages.Msg;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.URL;

public class APIvk {

public static void GetMessage () throws IOException {

HttpClient httpClient = new DefaultHttpClient();

HttpPost post = new HttpPost(

"https://api.vk.com/method/" +

"messages.get" +

"?out=0" +

"&access_token=" + Controller.access_token);

HttpResponse response = httpClient.execute(post);

post.abort();

String line = "";

URL url = new URL(post.getURI().toString());

BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));

line = reader.readLine();

reader.close();

new Msg(line);

}