import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;

import java.io.IOException;

public class Main {
    public static void main(String[] args) throws IOException {
        String url = "https://testemision.thefactoryhka.com.do/api/Autenticacion";
        String json = "{\"usuario\": \"130960054_int\",\"clave\": \"130960054\",\"rnc\": \"130960054\"}";

        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost request = new HttpPost(url);
        StringEntity params = new StringEntity(json);
        request.addHeader("content-type", "application/json");
        request.setEntity(params);

        HttpResponse response = httpClient.execute(request);
        System.out.println(response);
    }
}